Thursday, March 31, 2011

Voltage regulator with LT1086

One way to provide good negative-voltage regulation is with a low-drop-out positive-voltage regulator operating from a well-isolated secondary winding of a switch-mode circuit transformer. The technique works with low-dropout types.

Wednesday, March 30, 2011

Horn siren use the IT and OT transformer

Basically siren on a police patrol car and an ambulance use electronic circuit connected to the DC current. When the switch is pressed, the siren sounds immediately come out.
For those of you who own a car, or any motor you can also create a similar horn. Placement was also very practical. And if you want the flashing lights can add your own. In a series of above do not use flashing lights as the sirens sound.
Horn siren use the IT and OT transformer
Part List :
R1 = 47K
R2 = 200R
C1 = 0,02uF
C2 = 50uF 16V
C3 = 0,005uF
T1 = 2SB178 PNP transistor
S1 = Push button switch
G1 = 6-12V battery
 TR1 , IT transformer is reversed. used a two-legged.
TR2 , OT output transformer OT240

How to use it is to put the above series into a box. Adjust the size to be more practical. Then insert the cable of a car or motorcycle battery voltage as described above that is 6-12 V battery into the plug. In accordance with their respective poles.
Three feet of IT transformer wrapped so as not to stick to the body of the car or motorcycle. Cover with insulation that is resistant to water. Then try if already issued a siren sounds and if so, ready for use.

Monday, March 28, 2011

2 X 0,32W BA5386 amplifier schematic

Amplifier circuit above scheme is a combination of the two IC was then made into one of its supply voltage so it does not require a lot of supply voltage and output a stereo input. Output issued also very low at 2 X 0.32 W and has 8 ohm impedance. Indeed, this amplifier has a very low output, but the amplifier is quite easy to make and does not require much cost. The voltage required at least 4 volts while the maximum supply voltage of 12 volts.

Sunday, March 27, 2011

2,3 W Mono power amplifier schematic

This amplifier circuit using ic BA534 as a main amplifier, manufactured by ROHM ic, and packaged in SIP1-8. This amplifier circuit has a maximum output of 2.3 Watts with 4 Ohm impedance. Frequency response is between 30Hz to 18KHz. For the voltage needed at least 9 Volt and 13 Volt maximum. For a list of components can be seen below.

Friday, March 25, 2011

Relay driver using ne 555

This circuit is used to drives relays of 24 and 18 VDC from a 12 Volt power supply. The basic circuit on the IC NE 555 timer and use this circuit with almost any NPN or PNP power transistor.
relay driver

R1 = 47K
R2 = 10K
R3 = 56R

C1 = 0.01uF
C2 = 0.01uF
C3 = 0.001uF
C4 = 0.1uF
C5 = 50uF

Q1 = TIP29 , TIP120, 2N4922, TIP61, TIP110, or 2N4921
Q2 = TIP30 , TIP125, 2N4919, TIP62, TIP115, or 2N4918

U1 = NE555

Tuesday, March 22, 2011

12 V battery charger with PUT

A short-circuit proof battery charger will provide an average charging current of about 8A to a 12V lead-acid storage battery. The Charger circuit has an additional advantage, it will not function nor will it be damaged by improperly connecting the battery to the circuit. With 220V at the input , the circuit comences to function when the battery is properly attached.
simple battery charger
The battery provides the current to charge the timing capacitor C1 used in the PUT relaxation oscillator.When C1 charges to the peak point voltage the PUT , the PUT fires turning the SCR on , which in turn applies charging current to the battery. As the battery charges , the battery voltage increases slightly which increases the peak point voltage of the PUT. The voltage on C1 increases until the zener voltage of D1 is reached , which clamps the voltage on C1 , and thus prevents the PUT oscillator from oscillating and charging ceases. The maximum battery voltage is set by potentiometer R2 which sets the peak point firing voltage pf the PUT . In the circuit shown , the charging voltage can be set from 10 V to 14 V - the Lower limit being set by D1 and the upper limit by T1.

Part List :

R1 = 10K
R2 = 50K trim
R3 = 47K
R4 = 1K

C1 = 0.1uF

Diode , SCR , PUT
B1 = MDA990-1
D1 = 1N5240 10V
SCR = 2N5164
PUT = MPU131

Transformer , Inductor
T1 = Stepdown 220V to 14V
T2 = 11Z12 1:1 

Saturday, March 19, 2011

Low Forward Drop Rectifier schematic

A TMOS power FET , Q1 , and LM393 comparator provide a high efficiency rectifier circuit. When Va exceeds Vb1 U1's output becomes high and Q1 conducts. Conversely, when Vb exceeds Va1, the comparator output becomes low and Q1 does not conduct.

Wednesday, March 16, 2011

Power amplifier for FM radio receiver

Schematic  is suitable for use in radio tuner or FM radio receiver when it is assembled and ready for use. Where if the low gear power radio receiver, with the aid of power amplifier is less powerfull voice / hard to better and just right. For use hios  speakers , use a low-power , because power amplifier has only the power output of 2 X 5 Watt stereo power amplifeir with impedance of 4 Ohm. Working on a minimum voltage of 4.5 Volts and maximum of 16Volt. Use the correct voltage supply - really have been filtered out in order to improve the performance of these power amplifiers.

LM390 power amplifier schematic

Circuit schematic above is / include power amplifiers that have low power output. 1 Watt output power is only based on the IC , and ic used LM390 , manufactered by NS and ic packaged in DIP-14. For output impedance have 4 OHm. Requires a minimum voltage 4 Volt and Maximum voltage is only 9Volt.

Monday, March 14, 2011

3 Watt power amplifier schematic

This time I will share a circuit of schematis power amplifier with LM380 IC that has similarities with LM384. Enough with just a few components you have to make this power amplifier circuit . All components with relatively low prices and making a fairly easy. For this amplifier output power has 3W with 4 ohm impedance. Indeed , this amplifier has the output is quite low and certainly will not be maximal if it works on the speakers with high power.

6 Watt stereo power amplifier schematic

Basiccally,this amplifier works with the IC, which is where ic is associated with several other components in the supply and use DC voltage, which corresponds to the needs of IC above course on the circuit schematic. For IC , stands intregated circuit used is ic LM379 which has a maximum 6 Watt stereo output. This IC manufactered by NS and with SDIP-14 package. While other components needed in the circuit schematic , you can see components of the list below.

LM377 Power amplifier schematic

Various needs of the amplifiers are all different. Different places and use also requires a different power amplifier as well. For this time i gave a circuit schematic power amplifier based on LM377 ic that has similarities with the LM378 and LM1877. Power is smoothly small ouput is 2 X 2.5 Watt and the impedance 4 ohms. Use of this amplifier suitable for portable radio tuner that can be taken every where.

Capacitor leakage circuit tester

Generally capacitor that complement with television circuit is often leaked. Consequently spots more rugged display disturbing images running. This is not desired by the owner is not it? For those who know about electronics is certainly a problem. They will find the cause and trying to fix it. For it is not uncommon to use multitester a a search tool damage. But for those who do not have a tool that becomes an obstacle . However , for those of you who enetered last category do not sad because they can assemble their own tester. This tool is very simple but very sensitive to the leackage of a capacitor.

Sunday, March 13, 2011

FM Radio Transmitter schematic with pcb

For those of you like / love to talk in the air can assemble this simple circuit that can be received by the radio receiver to within a few hundred feet. The voice that issues by this circuit at all clear without rustling. Can also be used to link communications over the air using this radio transmitter, provided that other person also had the same circuit.

Saturday, March 12, 2011

IC LM12 , 150 Watts high power amplifier

To supply the required voltage to the  amplifier circuit minimum of 7 Volt and a maximum of 24 volts . Incurred sizable ouput for amplifier ic 300 W maximum output.

Radio station blocker circuit

radio station blocker circuit and schematic
This device is reversal of a radio station , because it sends an empty signal to the frequency chosen in order to remove the actual broadcast. Removing broadcasting? Is the radio transmitter would be lost 10.000W , yes we only use this circuit at close range only , because the utility block radio station not far away . This device needs to close to the antenna radio receiver, at least according to the ammount of radio frequency ( RF ). To the circuit schematic can be see below.

Long range FM voice Transmitter circuit

This circuit shows how to build a super-sensitive, mini-powered FM transmitter consisting of a RF (radio Frequency) oscillator section interfaced with a high sensitivity, wide pass-band audio amplifier and capacitance mike with a built-in FET (Field Effect Transistor) that modulates the base of the RF oscillator transistor. Transistor Q1 forms a relatively stable RF oscillator whose frequency and is determined by the value of coil L1 and turning capacitor C4.

Friday, March 11, 2011

DIY HDMI Switcher

This is a relatively slow place, so if you don't feel like interpretation the total phenomenon, fair scroll to the halt and read the TL;DR section.

okay, I know I haven't posted concerning a while. I was on vacation in Vermont final week, at some point in demo Break. We went skiing near. I've additionally been working on a a small amount electronics project. I've by no means made no matter which like it in the past, until in a jiffy I've been in performance around with circuits on breadboards. This is the in the beginning electronics project I've prepared to has a doable claim.

So come again? is this challenging and novel project of mine? It's an HDMI Switcher. It has two HDMI inputs and lone HDMI output. This device chooses which HDMI input self-control be there connected to the output.

at this juncture's a real humanity illustration to help visualize it (This is, participating in statement I beg your pardon? I'm going away to be using it in place of); I bear a PC and a Blu-Ray player, amid other things. I make use of both of them with my HDTV. But if I aspire to use my PC on the tube, I have to move out behind and drag the HDMI cable obtainable of the blu-ray player and plug it in to my PC. at that time if I want to use the blu-ray player again, I have to go behind the equipment again and switch the cable.

come again? this device long for accomplish is get to it so with the purpose of I can grasp them both plugged modish on the same clock, but I can press a button to switch involving them. So I can wish which solitary is departure to the tube next to the bit of a button, lacking having to switch up several cables when I aspire to use individual of them and the other happens to remain plugged in.

It isn't finished. Indeed, it's still arrived the planning stage. I have a schematic drawn, but I won't stake it yet for the reason that it's partially-finished! I'm making it on a PCB, and prototyping it on a breadboard isn't an option since we'a propos dealing with dial signals by the side of frequencies up to ~340MHz. Therefore, calculating parasitics in this circuit is essential. and, the multiplexer IC I'm using calls in support of a point controlled amount of differential transmission line impedance. To stay decent, I don't know could you repeat that? to facilitate course. That's a different occurrence I'll partake of to numeral old hat (This is made much easier for the reason that the kind relatives on ##electronics have pointed me dressed in the perfectly direction!). But I know so as to I can't create a controlled importance of it on a breadboard.

So, I'm going away to have to fritter lots of moment in time on the planning stage, since if I order parts and comprehend a PCB fictitious, and I made a misstep, with the aim of's money and time down the drain for the reason that therefore I maintain to order a innovative PCB and maybe new components too.

So, give permission's possibility it machinery! And even if it doesn't, it preference ensue a huge learning experience. This project will affect shell-mount soldering, PCB design and ordering, brainwashing an AVR microcontroller playing piece, and supplementary. And all of persons things I have by no means made already.

This is the start of a sequence of posts, which spirit transpire complete as the project is complete.


- I'm making an HDMI Switcher

- It will require conniving and ordering a PCB, and soldering ascend-mount parts, and encoding an AVR microcontroller

- I'll be real rearrangement commonly concerning it on this blog, I'll be sharing lots of in order with the aim of I've learned and experiences that I engage in the whole time the project.a

Metal Detector Circuits

One type of metal detector is a type of beat frequency oscillator (BFO). The methods used in metal detectors in general are changing the characteristics of the oscillator when there are close to the metal sensor. The detector works based on the resonant frequency that has been set change when there is a metal object is located quite close to the search coil sensors.

Tuning circuit (tuned circuit) should be a part of our oscillator circuit so that if approached by a metal coil sensor specific hence the output frequency of the oscillation circuit is about to change. Variation changes the output frequency depends on the frequency chosen. The selection of the higher frequency will cause the circuit sensitivity increases because the greater the frequency change. Stay if the selection frequency is too high then the practice will produce a system that is not sensitive. This is because the high frequency of most will not be reflected back but will be absorbed by the soil, building materials.

Metal Detector Circuits
Add captionMetal Detector Circuit Diagram 
Frequency used (f1-produced by the tank circuit with L1) is usually above the human hearing ability. Because it can not be heard by human pendegaran the frequency changes that occur will also not be heard as well. To overcome this it should be made a separate tone (audible frekuency-f2) which shows the change in frequency. This is said with the beat.

By mixing the two signals (f1 and f2) will produce signals f1, f2, (f1 + f2), and (f1-f2). The signal can be heard by human hearing is a signal (f1-f2). So when there are changes in frequency caused by changes in the characteristics of the search coil can be heard by humans as a rhythm-beat changing. Rhythm-beat is what is the signal (f1-f2) earlier.
VC1 setting is not easy because it requires experiments on certain metals. Similarly, for setting the rhythm of the beat is heard because at a certain condition will feel the rhythm of this beat very disturbing. So it was no possibility the beat or rhythm is not produced beatnya lower than normal because all these conditions can be set on VC1.

So when there are changes in the characteristics of the search coil it will produce sound frequency also depends on the different frequencies generated by the L1 and L2 frequencies generated by.
This method still has the disadvantage that its output frequency variation is still too small to change its frequency is almost not visible. Additionally, on certain conditions Dapa produce a frequency below the audible sound. For that we need a reconfiguration of coupling capacitors and the frequency of use.
The values ​​of existing components dirangkaian Figure 2 represents the values ​​specified in a metal. So for a specific metal component values ​​need to be adjusted especially VC1, C1, C4, and C5.

Inductor L1 is formed from the coil that serves as a search coil. This inductor will resonate along with the VC1 to produce a tank circuit with Q high. The second oscillator is formed from L2, C4, C5, R4, and Q2 and the oscillator circuit will produce a signal with a fixed frequency. D1 serves as a simple mixing between f1 and f2 and will generate a signal with a frequency (f1-f2) and a lot of harmonic signals. Signal with a frequency (f1-f2) is made so that it can be in areas that can be heard by human hearing.

Suppose that f1 and f2 on the 100KHz 101KHz then after dimixer, signal (f1-f2) will produce a signal with a frequency of 1kHz. This differential signal must be amplified in advance using a opamp that will only be able to drive headphones with high impedance. If the chill to be used for regular headphones then Dapa LM741 amplifier chip is replaced with the type of audio amplifiers. Because ampilifier audio output has a low impedance. Amplifier gain setting is determined from the setting R7 and R10, and if necessary the output of the LM741 can be incorporated into a power amplifier circuit to drive an spaker.

Circuit in Figure 2 is very simple to allow the occurrence of frequency drift - a shift in frequency. This is usually caused by the temperature factor. However this problem is not a serious problem. Permsalahan can ditanganni by searching for capacitor components which have a large enough temperature tolerance. In addition, PCB layout also has a huge effect on this problem.

The size of the search coil depends on the sensitivity of metal detectors are cooled and form of the sensor itself. For example, a large search coil which of course can easily find the metal you are looking at a large area rather than a metal detector with a small search coil. Instead of metal detectors can not determine the location of cables on a wall tertanan precisely because of the large size of the sensor.

So the greater the search coil, the accuracy of his smaller but bigger sensitivty but instead a small search coil, commonly used to compact metal detector, have high accuracy but less sensitivity. The shape of the search coil is usually a circle or square. Besides needing a shield layer which serves to reduce electrostatic effects and effects caused by capacitive objects.

Fan controlled by audio signal and temperatue sensor

Circuit which is also equipped with temperature sensors would protect the high temperature. However, in the below circuit which necessiatated the input of the amplifier / audio signal. The way it works is , if the amplifier circuit to work and ouput signal to be connected to this circuit , Fan 12V will work well. If the received audio signal this circuit does not exist , then the fan 12V die. And automatic circuit amplifier also not work and does not require refrigeration. Fan controlled by audio signal and temperatue sensor

 temperature fan
Part List :
R8_________________33R 4W
C2_________________47uF 25V
C3_________________100uF 25V
F1_________________Fan 12 Volt

10.000x Booster with Transistor

10.000x Booster with Transistor, For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous transistor such as the BC547B, the gain of the transistor is roughly equal to 40 times the collector current (Ic), provided the collector current is less than a few milliamps. This value is in theory equal to the expression q/KT, where q is the charge of the electron, K is Boltzmann’s constant and T is the temperature in Kelvin.

For simplicity, and assuming room temperature, we round this value to 40. For a single stage amplifier circuit with grounded emitter it holds that the gain Uout /Uin (for AC voltage) is in theory equal to SRc. As we observed before, the slope S is about 40Ic. From this follows that the gain is approximately equal to 40I cRc. What does this mean? In the first instance this leads to a very practical rule of thumb: that gain of a grounded emitter circuit amounts to 40·I c·Rc, which is equal to 40 times the voltage across the collector resistor.

If Ub is, for example, equal to 12 V and the collector is set to 5V, then we know, irrespective of the values of the resistors that the gain will be about 40R(12–5) = 280. Notable is the fact that in this way the gain can be very high in theory, by selecting a high power supply voltage. Such a voltage could be obtained from an isolating transformer from the mains. An isolating transformer can be made by connecting the secondaries of two transformers together, which results in a galvanically isolated mains voltage.

Circuit diagram:
10.000x Booster with Transistor
10.000x Booster with Transistor
That means, that with a mains voltage of 240 Veff there will be about 340 V DC after rectification and filtering. If in the amplifier circuit the power supply voltage is now 340 V and the collector voltage is 2 V, then the gain is in theory equal to 40 x (340–2). This is more than 13,500 times! However, there are a few drawbacks in practice. This is related to the output characteristic of the transistor. In practice, it turns out that the transistor does actually have an output resistor between collector and emitter.

This output resistance exists as a transistor parameter and is called ‘hoe’. In normal designs this parameter is of no consequence because it has no noticeable effect if the collector resistor is not large. When powering the amplifier from 340 V and setting the collector current to 1 mA, the collector resistor will have a value of 338 k. Whether the ‘hoe’-parameter has any influence depends in the type of transistor. We also note that with such high gains, the base-collector capacitance in particular will start to play a role.

As a consequence the input frequency may not be too high. For a higher bandwidth we will have to use a transistor with small Cbc, such as a BF494 or perhaps even an SHF transistor such as a BFR91A. We will have to adjust the value of the base resistor to the new hfe. The author has carried out measurements with a BC547B at a power supply voltage of 30 V. A value of 2 V was chosen for the collector voltage. Measurements confirm the rule of thumb. The gain was more than 1,000 times and the effects of ‘hoe’ and the base-collector capacitance were not noticeable because of the now much smaller collector resistor
Author: Gert Baars
Copyright: Elektor Electronics

Video Amplifier using BC560

Video Amplifier using BC560 Circuit Schematic
Video Amplifier using BC560 Schematic Diagram
The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this can be obviated by the addition of two resistors. If in the diagram R3 and R4 were direct connections, as in the original design, and P1 were fully clockwise and P2 fully anticlockwise, such a large base current would flow through T1 that this transistor would give up the ghost.

Moreover, with the wiper of P2 at earth level, the base current of T2 would be dangerously high. Resistors R3 and R4 are sufficient protection against such mishaps, since they limit the base currents to a level of not more than 5 mA. Shunt capacitor C4 prevents R4 having an adverse effect on the amplification.
Author: L.A.M. Prins
Copyright: Elektor Electronics

Thursday, March 10, 2011

High-pass and low-pass filters

Subsonic and ultrasonic filters can be combined into a single circuit for more stable and orderly bandwith. This good and qualified for only two frequencies with the rotation of widely separate. Circuit schematic below shows the rotation of the scond-order or high-pass Butterworth filter in combination with secon-order low-pass filter.

op amp bass

Part List :
IC___IC op-amp

For the capacitor , use the ceramic capacitors .

LM2901 LED bar-graph meter

Several LED above and other components used to determine the signal amplifier, when in a state of high and low . If the signal received from the amplifier circuit is high then the LED lamp are lit up everything and more bright LED lamps, but otherwise if the received signal is low then the lights on only one or two , even absent or faint.

Rapid battery charger schematic

The First ac voltage from tranformator will be rectified and filtered to the LM723 voltage regulator and the NPN pass transistors setup for constant current supply. The 470 Ohm resistor is limit trickle current the momentary pushbutton (S2) is depressed, the SCR turn  on , and the current flows through previously determined resistor  network.SCR will be turn off if thermal cutout inside the battery pack opens up.

Wednesday, March 09, 2011

9V output switching power supply

By using the circuit you do not bother to roll  up a transformer that is used to reduce voltage AC 220V to 7V ,9 V or 12V, etc. When using a large transformer we will find it hard to make transformator. by rolling hundreds or even thousands of times roll. But if you use this circuit a little just enough to roll trafo not to small, and its be relatively small.

Universal switching power supply for TV

The schematic above can be used for supply on color TV for all type TV circuit. But we need to know how much voltage needed by the circuit of color Television. To set the output voltage, the setting on VR1 1K ohm. Required input voltage 300V DC which is already on TV circuit, so we just take a 300V dc voltage existing on the TV circuit, and for a circuit supply voltage on our TV cut the line PCB and connected with this  universal switching power supply.For the transformer we can use the TV regulator transformer.

Low ripple power supply schematic

Simple schematic above is a circuit of power supply that can operate at high current with very small ripple voltage. How it works similiar to the high power class AB amplifiers, with the same quality. T1,T2 ,and R2 can also be called a power NPN-Darlington transistor. ZD1 and R1 as a supplier of voltage on the transistor base and filtered by C2. ZD1 can be slected with formulated (Figure 1.0) . For the C2 can be selected in accordance with the degree of smoothness as its value is effectively combined with the multiplied gain of the Transistor T1 and T2, assumsing minimum hfe for T1 and T2 , C=100x15(T1) x 25 (T2) = 37,000uF, adjust the voltage C2 with the input voltage, but must be higher than input voltage.

Tuesday, March 08, 2011

LM338 Adjustable power supply circuit

It's a circuit of adjustable 10-A regulator , with the IC LM338. The first working mode 220V AC current reveled by T1 to 30VAC then rectified by four diodes D1,D2,D3,and D4 and become less than 30VDC. Not enough to be rectified voltage is filtered in the C1 and C2. And CT/ground  should not be used because the voltage needed on the circuit above is only plus and min, so the ground was stopped first. After the voltage is filtered and then go to two IC , for setting the voltage output is on Vr1, the output voltage of 0 to 30 Volt DC regulated.

Monday, March 07, 2011

Inverter 12V to 115V with 25 W power output

Low power inverter schematic are only use 9 components , one of which IC 556 , TIP120 NPN Darlington transistor.

And turns 10 to 16 Vdc into 60 HZ, output 115 V square-wave power to operate ac equipment up to 25 W. In the circuit first ic originally hires as a timer chip m for stabilizatiom oscilator with components R1 and C1 setting frequency oscilator. Then the two transistor driver, drive the transformer push-pull fashion, When one transistor is biased on , the other circuit cut-off . The transformer is a 120V/18Vct unit that is connected backwards, so that it steps the voltage up rather than down. Oscilator circuit operates from about 4 to 16 V for  stable output.

Inverter 12V  to 115V  with 25 W power output
 Part List :
R1 = 1K
R2 = 12K
R3 = 1K
R4 = 1/4W
C1 = 1uF
IC = 556
Q1 = TIP120
Q2 = TIP120
T1 = 120V 18VCT

Sunday, March 06, 2011

Classical audio power amplifier with IT and OT transformer

The circuit is devote to the radio receiver in which sound ( the gear ) is weak. With the help of this tool , which initially sounds as if far to be clearly audible. Power amplifier does not require much  electrical current source , because all components are not up to over 1 Mega . But the result was incredible because it can enhance the power of  catching the wave signal.

TA7214 stereo audio power amplifier

Not all that omplicated circuit schematic of power amplifiers have a good and quality sound, but in the circuit above , although a little tricky for the layman on the circuit , and the sound quality is also good.

TA7210P Not only used to power amplifier ,it can to be companion

To improve the quality of the amplifier circuit above in addition to other power amplifiers , can also be as an additional reinforcement such as a master LA4145 BBE sound, audio processor , etc. For TA7210P ic can be used on the audio processor and power amplifiers , power amplifier refer to the spesifications below .

3,4 W power amplifier schematic

The schematic above is amplifier based on ic TA7211P or TA7212P , circuit above using OT transformer as a booster amplifier again. The amplifier suitable used on outside / field, because by using a transformer OT is identical to the PA amplifier.

Saturday, March 05, 2011

Audio amplifier with IC TA7203P

Stereo power amplfier with TA7203P , is suitable for the room your car , your car it will build an increasingly crowded and felt like using high-class amplifiers and speakers. Simply using this circuit and some speaker subwoofer speakers you can enjoy it.

Audio amplifier with IC TA7203P Circuit Diagram

Audio amplifier with IC TA7203P

Technical information Audio amplifier with IC TA7203P :
Max voltage = 20 Volt
Min voltage = 8 Volt
Max output  = 2 x 40 Watt
RL               = 8 Ohm

See Other IC Amplifier circuit

10 watt power amplifier

10 watt power amplifier based on TA7200P has a 3,3 W output and the equation of TA7204P has a power output of 4,2 W , using the circuit above , in  both ic can have 10 watts of output power amplfier , but the quality of each ic remains different. Both ic manufactered by TOSHIBA.

10 watt power amplifier based on TA7200P has a 3,3 W output and the equation of TA7204P has a power output of 4,2 W

Part List :power ampifier circuit
Resistor   = 100K x 2, 820R
Capacitor = 1uF , 10uF , 100uF x 2, 4u7F , 820pF , 15 pF , 47uF, 470 uF.
IC            = TA7200P / TA7204P

Technical information :
Max. Voltage = 20 Volt DC
Min. Voltage = 10 Volt DC
Max. Output = 10 Watt
Approx. RL  = 4 - 8 Ohm
Approx. Ft   = 30Hz - 18KHz

3V Fluorescent lamp voltage source

Fluorescent lamp assembly using only a 3V voltage source. 2 battery which i parallel to supply its circuit of fluorescent lamp. By using the above circuit is very useful if it saves electricity and power outages at home , or used in  a dark place.

3V Fluorescent lamp voltage source
Circuit of works, and lamp lights
3V Fluorescent lamp voltage source
This is circuit , battery , and fluorescent lamp 20W

3V Fluorescent lamp voltage source

3V Fluorescent lamp voltage source
Working circuit on the dark
Interest with this circuit : Fish Caller Electronics

Friday, March 04, 2011

Accu charger with IC LM723C

Circuit of 12 V accu / battery charger with IC LM723C. This Accu charger have input from the first transformer - voltage 220 initially V/110V/240V,  the input voltage lowered approximately 12 VAC, then voltage 12 Volts will be rectified by D1 and then filtered by C1 , then filtered and amplified again by IC LM723 and NPN transistor , output voltage is ready to use to charging the accu / battery.

Wednesday, March 02, 2011

Radio circuit without source voltage

Maybe you do not believe , because so long radios sold in the form usiong DC power as the driving component work. But I took to fiddling with radio without making a circuit of electrical current/voltage source which is rather strange. Radio Works well if no one put the components in accordance with its placement or its symbol. Therefore , we must consider the placement and and examined before starting step in assembling this very simple circuit.

Bully FM radio signals

Interfere with fm radio signal is fun, if you're bored or no work, you can do at home, where neighbors , at school , or even near the transmitter. With the circuit above you can interfere with the speech signal in condenser microphone , and the signal will be issued by the circuit will then be received by FM radio receiver and a voice that we remove it before going out mixed with the signals emitted by radio FM transmitter.

Tuesday, March 01, 2011

Tranceiver DC adapter

This DC adaptor provides a regulated 9V source for operating a transceiver in the car .The IC LM317 is mpounting tab is electrically connected to its output pin. so take this into account tour version of the adapter. The LM317T regulator dissipates 2 or 3 Watt in this circuit , so mount it on a 1- x -2 inch piece of 1/8 inch thick alumunium heatsink. Dont forget to give heatsink on the IC LM317.

High temperature protector with IC 3584

IC 3584 has thermal protection or voltage automatically shutdown when the temperature at IC exceed 150 degrees or more. You can operate this circuit at the transistor or IC heatsing, if a transistor or IC had exceeded the limit of the heat circuit automatically shutdown.

Controlling switch with relay driver

The circuit above is  a circuit of drivers to control high voltage using the relay. Relay is controlled by an NPN transistor , its that works on 5V voltage and has diode in it, if the relay does not have s diode should be given with diode 1N4007 . Pin relay to  move the switch connected to V+ 5V and other is connected from driver NPN transistor , the base od the transistor may have input such us from circuit of infrared to control the distance, or with some other input.

1W Audio power amplifier circuit

LA4145 an IC with SIL-9 package and manufactered by SANYO. This ic has miraculous equation with LA4146 and LA4147, so if you do not have the IC LA4145 but you have IC LA4146 or LA4147 , you still can make the above amplifier circuit. The circuit includes circuit of classes on low power because it has low output is 1W with 8 ohm impedance.