Monday, January 30, 2017

USB Powered Audio Amplifier LM386 + Tone Control

USB Powered Audio Power Amplifier using LM386 include tone control circuit

USB Powered Audio Power Amplifier is a multimedia speakers external used for PC's or Laptop, has using single chip Amplifier that based on LM386 as a part for amplifying signal audio from PC or Laptop. The IC LM386 is a power amplifier designed for low voltage class AB amplifier,wide range voltage input, supply voltage minimum 3V and maximum 12VDC. So it can be used on a USB Voltage 5VDC from output PC or Laptop. 

For DIY USB Power Amplifier by using this LM386 you a Parts that you need below an example:

USB power amplifier parts you need
Parts and Tools:
-Components and PCB Power Amplifier LM386 + Tone Control (Circuit and Layout include below)
-USB Male Cable Connector
-3.5mm Audio Jack Male and stereo cable for audio
-Speaker + Cable
-Some Solder Tin
-Soldering Iron
-Cutting Pliers

The LM386 Mono Power Amplifier include Tone Control Circuit Diagram:
LM386 Power Amplifier Circuit USB Voltage input + tone control
Circuit above is Mono Circuit Power Amplifier and Tone Control, if you need a stereo amplifier you just multiple the circuit. Voltage supply input from USB added rectifier diode 1N4007 for rectify and additional fuse if the power amplifier short, so saving the PC or Laptop USB from damaged. For output power amplifier its very low power that about 1W. 
For this USB Powered Audio Amplifier Project, I'm using 2X10W Speakers at 4Ohm it can be drived by this LM386 Power Amplifier. The Tone Control Circuit is simple design so very poor performance for gaining bass and treble tones.

The LM386 Chip Amplifier:

LM386 Chip photo by elcircuit

Complete PCB Layout Design Power Amplifier + Tone Control:
Layout PCB Top view:
Layout PCB LM386 USB Power Amplifier
Layout PCB Bottom view:
PCB design Mono Power Amplifier LM386 + Tone Control
PCB and Physical Components view:
DIY USB audio power amplifier by using LM386

Video USB Powered Audio Amplifier LM386 include tone control:

Monday, January 23, 2017

TDA2030 make for Subwoofer Amplifier Circuit

TDA2030 is a widely used 14W audio power amplifier monolithic integrated circuit in Pentawatt [ package, intended for use as a low-frequency class AB amplifier. However, some home theater prototype came with TDA2030 design has a problem of low volume. There are ways to increase the subwoofer performance that uses TDA2030A design.

TDA2030 make for subwoofer amplifier circuit

Updated Schematic TDA2030 Subwoofer Amplifier adding voltage regulator 7815 and 7915 for supply voltage subwoofer filter:

TDA2030 Subwoofer amplifier using 4558 filter subwoofer

TDA2030 Subwoofer Amplifier Circuit Diagram

TDA2030 make for Subwoofer Amplifier Circuit

Increase subwoofer performance By Adding subwoofer filter 4558 and changing resistor

Some circuit board designs usually soldered a 10K or less value resistor in place of default 22K recommended by the 2030 designers. Use 22K or more instead of 10K to increase the gain thereby reducing the bypass of input to ground. (input should be noise free) However, the increasing gain over the recommended value may result in overheating the IC unless you have best heat control methods. And adding subwoofer filter 4558 can filtering subwoofer audio signal input.

Layout PCB Subwoofer Amplifier TDA2030 complete voltage regulator 7815 and 7915 for subwoofer filter 4558:
Layout PCB Subwoofer amplifier TDA2030 and 4558TDA2030 Amplifier complete Subwoofer Filter 4558 PCBTDA2030 Amplifier Circuit and 4558 Subwoofer circuit complete
*Click image to view larger

See complete circuit on this video:

Soft Start for Power Amplifier Circuit

Soft start is a circuit/module that serves to prevent the MCB (Main Circuit Breaker) at home is lost when the power button is pressed power amplifier / turned on first. Here is an example an overview of a soft start circuit.

Soft Start for Power Amplifier Circuit

Schematic Diagram Soft Start Power Amplifier especially on the power supply circuit.
soft start power amplifier circuit schematic diagram
At the time the power button is pressed, the circuit will soft start delay of approximately 3.5 seconds. The Circuit will delay voltage of 220V AC will supplying into circuit power supply contained in the power amplifier. Long delays depending electrolytic capacitor located at the base of the transistor c337. The greater its capacity electrolytic capacitor 220uF, the longer the time delay, but a long delay I do not recommend/ because it will burden resistor 68r / 10w, ultimately resistor it can be burnt.

For make the Soft Start Circuit we provide Layout PCB for making it easier.

Layout PCB Soft Start CIrcuit for Power Supply on Power Amplifier

Soft Start Circuit for power amplifier circuit to resist main ACsoft start circuit for power amplifier power supply

Wiring Diagram connection soft start circuit with power amplifier:

wiring diagram soft start circuit

Download pdf file schematic diagram:

Sunday, January 22, 2017

How to Parallel Final Transistor Power Amplifier

How can parallel the final transistor power amplifier circuit? comes to a question from a visitor elcircuit.com. And whether the function of the parallel final transistors? 
How to increasing wattage power amplifier by parallel transistor final.
First, how to paralleling final transistor power amplifier you must know the supply voltage, Emitter line, and Base transistor line, from power amplifier circuit. Then connect it to the parallel transistor, you can see below the schematic from power amplifier and the parallel transistor final.

I take an example 2800W power amplifier circuit on the block of its final transistors.
Final Transistor Amplifier 2800W
After we know its line, then you must parallel transistor like the schematic below:
Parallel Transistor final power amplifier
Then connect all together, as jumper connector to paralleling final transistor:
J1 to Emitter on power amplifier circuit
J2 to (+) Voltage supply 
J3 to (-) Voltage supply
J4 to (+) Base or NPN Base Transistors
J5 to (-) Base or PNP Base Transistors
J6 to Ground

Resistor before input voltage on a base function to divide voltage current and produced heat evenly in order to transistors. And the capacitors is to temporarily store incoming voltage to the transistors, in order to do not drop when a high load on each transistor. 
For transistors TIP3055 and TIP2955 in parallel are just as an example, you can change as needed. It would be better you use transistors of the same type in a circuit of power amplifiers.

To make it easier, I share the Layout PCB for boost transistor final amplifier:

Layout final transistor amplifier
Boost Final transitor power amplifier circuit
Actually already many discuss this issue. But it would not hurt my post back with a more simple and easy. What is the final transistors parallel function? Many say the final transistor parallel, it can increase the power produced wattage power amplifier. Is it really like that? The answer correctly. By increasing the number of transistors final wattage power will increase. 

But in addition to adding the final transistors, transformer capability should also be considered. As more transistors finals are mounted, so the power and the load will also increase. If not matched by sufficient transformer capability, then the power amplifier will drop immediately.

Download Final Transistor Booster Schematic.PDF

See this video paralleling transistor final:

Friday, January 20, 2017

TDA2040 Power Amplifier Circuit

TDA2040 Power Amplifier Circuit is an amplifier circuit that uses a single type IC TDA2040 as the main amplifier. These amplifiers typically used for reinforcement on the car because of its practical and have gained sufficient.

TDA2040 Power Amplifier Circuit monolithic class AB amplifier

TDA2040 is a type IC monolithic with the operation of the class AB amplifier circuit. This IC TDA2040  inside is equipped with a protection circuit for a short circuit, especially on lines speaker output. 
TDA2040 Schematic Diagram 20Volt 20Watt Hifi Amplifier

The TDA2040 Power Amplifier circuit above is an example circuit collated by strengthening the AB class using a single IC, the circuit is not quite different from the power amplifier circuit using TDA2030. wherein the circuit TDA2040 has a power output of 20 watts. IC TDA2040 has low distortion levels that are well suited for reinforcement at home amplifier. If you want to make this TDA2040 Power Amplifier, we provide Layout PCB and schematic with the file format (.PDF) below:

Layout TDA2040 TDA2030 TDA2050 power amplfieri circuit

PCB Layout Power Amplifier TDA2030 TDA2040


Thursday, January 19, 2017

Low and High Pass Filter circuit

Low and High Pass Filter circuit

This low and high pass filter circuit, it's a simple circuit that can filter audio signal low and high frequency. As function same as the bass booster and treble booster, but this circuit is just enhancing gain low and high audio frequency, so sound output have more bass and treble than vocal/middle.

Low and high pass filter using IC 4558 based Op-Amp Chip for main amplifying and filtering the audio signal. This circuit just need a 12VDC power supply ( non-CT ) and you give audio signal input, the audio signal output is more bass and treble, so soft and so powerful.

Below the complete schematic diagram and layout PCB, include pdf file and 3DS file for view 3D PCB layout.
Low Pass Filter and High pass filter circuit diagram

Low Pass Filter Layout PCB

High pass filter layout pcb using ic4558

File Download :

Monday, January 16, 2017

How to make subwoofer using IC TDA2822

Accordance with the above title How to make subwoofer using IC TDA2822, I want to share circuit diagram about IC TDA2822 for subwoofer speaker system. It cheap to built subwoofer audio system, by using subwoofer filter 4558 for filtering audio input and TDA2822 amplifier for driving subwoofer speaker. See the circuit diagram below:

Circuit Diagram TDA2822 Subwoofer
How to make subwoofer using IC TDA2822

TDA2822 Subwoofer on circuit diagram above has mono output power about 20W (bridge output), it is small output power for subwoofer system. you can use small speaker size for using this amplifier.

Download: TDA2822 for Subwoofer System.pdf

Sunday, January 15, 2017

High-Quality Subwoofer Low Pass Filter

This high-quality subwoofer low pass filter for your audio system.  This subwoofer filter control using an IC op-amp as a filter and booster subwoofer. The IC op-amp is using LM224 and TL072. The subwoofer filter is high quality and high performance, it gives you more bass and sub on your audio that you have. Below its schematic diagram for subwoofer filter and control include the power supply schematic.

High-Quality Subwoofer Low Pass Filter Circuit Diagram
High-Quality Subwoofer Low Pass Filter Circuit Diagram

Friday, January 06, 2017

NE5532 OpAmp Based Headphone Amplifier

This circuit is Headphone Amplifier using IC NE5532 , its ic usually using as OpAmp with very good performance. And we just using it for headphone amplifier. see this circuit diagram of it below complete with power supply schematic.

NE5532 Based Headphone Amplifier

NE5532 OpAmp Based Headphone Amplifier

This headphone amplifier schematic is a typical application schematic. Experiments show that the NE5532 for low-power amplifier, excellent performance and good price. Voltage supply about 12V DC assymetric. 

Thursday, January 05, 2017

STK0105 Power Amplifier and IC Inside

This power amplifier circuit is most popular power amplifier using IC STK0105, powerfull power amplifier have output power about 100W at 8 Ohm Load with voltage supply about 50VDC. If you want to build or knowing inside IC STK0105 im publish the IC STK0105 Schematic Diagram that the circuit drawn by Bassblaster505 you can see more at EasyEDA see the link below :

Schematic Diagram of IC STK0105
STK0105 Power Amplifier and IC Inside

Part List STK0105 Intregated Circuit
D1, D2 = 1N4001
R3 R1, R2, R3, R4, R5, R7, R9, R6, R8, R10 = 1k
TR1, TR2, TR3, TR5, TR7 = 2DC2412R
TR4, TR6, TR8 = BC807_16

If you finished making your own IC STK0105 , you must to assembling the ic with following circuit for working power amplifier using IC STK0105.

STK0105 power amplifier circuit diagram

LA4440 Stereo Power Amplifier

Return again at IC LA4440 power amplifier, stereo power amplifier circuit using IC LA4440 to provide an output power of 18 watts stereo. Stereo power amplifier circuit with LA4440 IC works with a voltage source + 12 volts DC with a current of 2 amperes. Power amplifier IC LA4440 is often used on the car stereo amplifier tape. IC LA4440 is a stereo amplifier chip that has the following technical specifications.

"It has 46dB of ripple rejection Low distortion Good channel separation Thermal protector

Overvoltage protector Surge voltage protector Pictures schematic and list of components to create a stereo power amplifier with IC LA 4440 can be seen in the following power amplifier circuit diagram.

Circuit stereo power amplifier with IC LA4440 above can be used to drive a load of 2 Ohm speaker load up to 32 Ohm, so it can be applied in a comprehensive audio device. 

Stereo power amplifier Circuit LA4440 IC can also be used to move the Horn type speaker audio system PA (Public Amplifier). Stereo power amplifier Circuit using LA4440 IC can be prepared by the PCB in the market. On the PCB market, stereo power amplifier IC circuit has been equipped with LA4440 tone control circuit is arranged in one piece PCB. 

LA4440 IC will generate heat when working with large volumes, therefore it is necessary LA4440 IC equipped with cooling (heat sink) to remove the heat generated. Power supply to circuit IC LA4440 stereo power amplifier can use a power supply with output voltage of 12 volts DC and the current minimum of 2 amperes.

Wednesday, January 04, 2017

Bass Treeble Booster Circuit

The tone amplifier circuit I have often referred to the Tone Booster. Its function is to strengthen the bass and treble tone gain for the audio devices you have at home. 

Should be emphasized again that this circuit I recommend to audiophiles who want to have a booming audio device prominent bass and treble powerful. The circuit is suitable for lovers of loud music is not music smoother or softer (mellow) due to the addition of the amplifier's tone of voice produced louder.

Actually I have a lot of product on the market to strengthen the bass and treble tone gain like Galaksi 4558, Turbo Bass, Giga Bass, and etc, it so forth but in my opinion, I do not like the product market because of the frequency of the tones produced less powerful. This means that most of the commercially available voice was too smooth and lacking bass boom, despite the fact that for the bass tones already powerfull according to me. 

But if you do not like the loud music, no anything because the music tastes of each individual. But this circuit worth the try to complete your audio device at home. See the schematic diagram below :

Bass Treeble Booster 
Bass Treeble Booster tone

The Schematic above are still in mono version, so if your audio device using the stereo version (L & R) you just make one more circuit to be paired to the device next to it.

This scheme is quite simple and not are expensive, the core of the circuit tone booster is a circuit filter tone passive consisting of R and C are collated in such a way so as to get the tone of the pass, then the circuit reinforced by an NPN transistor to be in get voice prominent and steady.

Different transistor sometimes her voice was different circuit transistor eg C945, C1815, C1162 and D313 may be even harder. But my advice to use only standard transistor C829 or C1815 is enough.

Symmetrical Power Supply from NonCT Transformer

Symmetrical Power Supply from NonCT Transformer

As a technician and hobbyists, we are often faced with the problem of for the need the type of a voltage, where we had just the kind of asymmetric (+ and 0 V) while needs symmetrical (+, - and 0 V).

From the many circuits that I know, usually electronics friends make the power supply circuit from AC voltage asymmetric (NonCT) become a symmetrical voltage (+, 0, -) use IC L165 as the primary phase voltage convert so that it can be processed / in a split to 3 output voltages. But working the IC was very hard to need a large heatsink.  However, on this occasion, I will share changer circuit a voltage to be symmetrical with utilizing asymmetric Capacitors, Diodes, Zener Diodes, and Transistors. For a circuit schematic can be seen below,

Circuit Diagram
Circuit Diagram Power Supply + 0 - from NonCT transformer

Circuit and PCB Design

PCB Design Power Supply
PCB and Component into assembling on PCB
Working Circuit:
In the circuit scheme above, the AC voltage input from 220V AC output step-down transformer, where the output voltage of the transformer of 14.8V AC.

Stepdown Transformer Output Voltage

0V AC voltage direct entry into the diode and 14.8V AC enter directly to between series capacitors 1000uF/35V. AC voltage is processed by both of these components, so as to produce a DC voltage symmetrical (+,0,-) then filtered by two capacitors 1000uF/35V and 220uF/35V. At this point, I check the voltage around 76.6VDC +V and -V DC

Symmetrical power supply non regulating

The Voltage (+) and (-) 76.6VDC, for it symmetrical (+),(0V),(-) 33.3VDC. Then the voltage is lowered and regulated by using series transistor TIP31, TIP32, Zener12V, Rectifier Diode.

Voltage converter from AC NonCT to CT

I'm using Zener Diode 12V then the output becomes +12V 0 -12V DC. If you want the output voltage +15V 0 -15V, use Zener Diode 15V.

Symmetrical Regulated Power Supply

12V Regulated Power Supply CT

Just sharing to be together, if there are still less make a comment on the column below.

TDA7386 Power Amplifier

I will give an explanation of TDA7386 Power Amplifier for previous post Making Surround Amplifier TDA7386 4 Channel.

TDA7386 IC amplifier

TDA7386 Pins:
Pin 1 TAB: Connection to the metal plate of the integrated circuit, it is connected to negative.
Pin 2 Negative at power output (P2)
Pin 3 Amplifier output 2 (-)
Pin 4 Standby. Ignition at voltage greater than 3.5 volts. Off at less than 1.5 volts.
Pin 5 Amplifier output 2 (+)
Pin 6 Positive recommended 14.4 volts
Pin 7 Amplifier output 1 (-)
Pin 8 Negative at power output (P1)
Pin 9 Amplifier output 1 (+)
Pin 10 SVR Capacitor 47 uF 16V to earth.
Pin 11 Audio Input Amplifier 1
Pin 12 Amplifier audio input 2
Pin 13 S-Gnd grounded audio (negative, see considerations).
Pin 14 Audio Input Amplifier 4
Pin 15 Audio Input Amplifier 3
Pin 16 AC-Gnd capacitor 0.47uF to ground.
Pin 17 Amplifier output 3 (+)
Pin 18 Negative at power output (P3)
Pin 19 Amplifier output 3 (-)
Pin 20 Positive Recommended 14.4 Volts
Pin 21 Amplifier output 4 (+)
Pin 22 Mute, Mute to less than 1.5 volts, with sound after 3.5 volts.
Pin 23 Amplifier output 4 (-)
Pin 24 Negative at power output (P4)
Pin 25 Offline

Due to its high consumption, extreme care must be taken with the ground and power connections.
In addition to the ground connection of the pin 13 must be connected to the audio input section and
A common ground that is not direct to some negative of an exit.

Usually a common point is used to the power capacitor

Technical Details :
In the specifications we speak of 49 W for each channel.
We can say that it is not really as powerful as it can deliver around 20 watts per channel at low distortion levels with a load of 4 ohms and power of about 14 volts, plus the maximum total heat dissipation is 80 watts ( @ 70 ° C).

This audio amplifier is designed for car radios, used in Sony®, Kenwood®, Pioneer® and other high-end radios.

But each channel of the TDA7386 can develop 49 W at 15.2 volts with a load of 4 ohms with very high distortion and saturation levels.

Still it is of high power and by its few components is an amplifier easy to construct.

The power supply should exceed 15 amps and should not exceed 18 volts.

Schematic Diagram of the TDA7386 Power Amplifier based on the data sheet of the manufacturer:

TDA7386 Power Amplifier

In this amplifier the audio gain is fixed (26dB)

The pin 10 SVR capacitor should not be less than 10 microfarads and helps to reject noises
From the power supply.

All capacitors are 16 volts but may be higher voltage.

The manufacturer recommended capacitor value for each input is 0.1 microfarad (104).

 In automotive radios the heatsink is quite reduced so for a more continuous home working amplifier a good heatsink should be used and a fan can be added from those that use computer sources.

In order to avoid introducing noise we add a resistance of 33 ohms 1W,
In addition to a capacitor of 220 microfarads of 16 volts or greater.

It is worth repeating that the life of the electronic components decreases by working at high temperature.

In addition incorrectly connected lands (-) can cause annoying noises
Or even oscillations that may damage the integrated circuit.