Sunday, February 19, 2017

5.1 Home Theater using Car Power Amplifier

5.1 Home Theater power amplifier, by using Car Power Amplifier convert for home audio. Many friends diy'ers who asked how to use car power amplifier installed and used in home audio. Actually very simple, only with requires a power supply voltage as a replacement car battery , that the battery voltage is 12 Volts DC. 

But first you have to recognize the car power amplifier, how the character of sound produced, preamplifier, in/out channel. Because in every car power amplifier have several channels input output. Typically in the market, car power have 2/4 channel. In topics this time I will explain how to operate car power amplifier used for 5.1 home theater.

5.1 Home Theater using Car Power Amplifier

To make audio 5.1 home theater, iam using two car power amplifier each has a 4-channel input and output.
One car amplifier to drive a left and right front speakers, left and right rear speakers.
And the other car amp, to drive a center speaker and subwoofer speaker. To drive a subwoofer required considerable power. Then 4 channel I bridge into two channels, so is able to lift the subwoofer speaker. Are still 2 channel more I bridge and used for the center speaker.

For operation amplifier, requiring voltage 12VDC, so that required power supply circuit for the home like the picture below.

Power Supply for Car Amplifier

Power supply circuit above is very simple. components are required:
  • Transformer ( Transformator ) Step Down from 220-240VAC to 12VAC with output secondary current is about 10 Ampere.
  • Bridge Diode , using 35 Ampere Diode for more durable diode to rectifying AC Voltage.
  • Capacitor for reduce riple voltage and save load electric current. Capacitor that is 10000uF / 35 two pieces,
  • Output Voltage 12 - 14VDC at 10 Ampere current.
After the power supply circuit is finished. You can assembly Car power amplifier for Home Theater as wiring diagram below.

Wiring Diagram 5.1 Home Theater Setup
Once youalready assembled as shown above. it is necessary to setting it on the preamp car power amplifier.

Adjusting tone control preamp filter car power amplifier :

Front Left / Right Channel to HPF ( High Pass Filter ) set the frequency 130Khz
Front Left / Right Channel to LPF ( Low Pass Filter ) set frequency into 220Hz
Setup and setting car amplifier

Center Channel to HPF ( High Pass Filter ) set the frequency 10Khz
Subwoofer Channel to LPF ( Low Pass Filter ) set the frequency to the lower , and give bass boost +6dB

Setup and setting audio car power amplifier

It's very simple, but if you set and assemble properly. So audio sound home theater will be sound live.

Tuesday, February 14, 2017

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.

Monday, February 13, 2017

Complete Tone Control Circuit LM324

Complete Tone Control Circuit LM324
There are many a circuit about tone control in this site, that the most similar circuit with this tone control is 4558 Parametric Tone Control. But this tone control circuit is an overall good performance to controlling your audio. The tone control adjusts by variable resistor Potentiometer that includes, High, Low, Middle, and Master Volume.

By using a single chip LM324 basic op-amp to control and adjusting the tone. This circuit needs voltage supply about 12V to 15V DC CT. Use regulated power supply and nice filtering the DC current, to get the sound output so less hum and more tone performance. This tone control is a mono circuit, if you want to make a stereo tone control, you must make multiple.
Below the Circuit and PCB Design of Tone Control Mono LM324.

Circuit Schematic Diagram Tone Control LM324

PCB Design Top Layer Tone Control CircuitTop Layer PCB Design Tone Control

Finished PCB Tone Control Mono LM324

Tone Control PCB DesignPCB Layout Design LM324

*note: Click images to view larger.

This tone control circuit is very matched with power amplifier circuits:
500W Power Amplifier Circuit

Friday, February 10, 2017

Mini Digital Stereo Power Amplifier with USB Voltage

This is Mini Digital Stereo Power Amplifier with Based on single chip IC PAM8403, by using IC PAM8403 and other components. This Amplifier can call as Super Mini amplifier, see this amplifier kit PAM8403.
Mini Digital Stereo Amplifier PAM8403
Mini Digital Stereo Power Amplifier with USB Voltage 5v power supply

The amplifier power is very small, the size of the headphones makes this amplifier extremely practically does not take place. With an input voltage of 5V taken from USB, power amplifier output is about 3W stereo amplifier. Her voice output is not bad, for a stereo amplifier's surround.You can buy these at Mini digital amplifier electronics stores online, which is already widely spread.

Wiring diagram for Mini Digital Stereo Power Amplifier:

Wiring circuit for stereo digital power amplifier

How to run a mini amplifier is not so difficult, it just takes a few supporting components, namely: 2 Fruit Speaker 10W 4ohm, 1 USB Male, 1 audio input jack (I use a 3.5mm jack male), and some cables to connect the circuit.

PCB lettering on OUT + - is output to the speakers Right and Left, LR for audio input and 5V + - for the power supply.

Here is a video Digital Mini Stereo Power Amplifier Circuit:

Running Text with LCD 16x2 using Arduino Uno

16x2 LCD Arduino making running text
LCD 16x2
LCD (Liquid Crystal Display) is a type of display media which uses a liquid crystal as the main performers. LCD already used in many fields, for example in electronic equipment, such as televisions, calculators or computer screen.
In experiment this time I will display the Running text (text Running) using 16x2 LCD which means LCD consists of 16 columns and 2 lines of code
Arduino Uno Board
Arduino Uno Board elcircuit

Tools and materials required:
  • 1x Arduino Uno
  • 1x Potentio meter 5K Ohm
  • 16 Pin header (Connector) and then soldered to beforehand to the LCD)
  • 1x Breadboard
  • Jumper cables sufficiently
  Here is a table description of the pin on the LCD 16 X 2:

Pin Name Description
1 VCC +5V
2 GND 0V
3 VEE Contrast Voltage LCD
4 RS Register Select
5 R/W 1 = Read, 0 = Write
6 E Enable Clock LCD
7 D0 Data Bus 0
8 D1 Data Bus 1
9 D2 Data Bus 2
10 D3 Data Bus 3
11 D4 Data Bus 4
12 D5 Data Bus 5
13 D6 Data Bus 6
14 D7 Data Bus 7
15 Anode  Positive Voltage backlight 
16 Catode Negative Voltage backlight

LCD Pin Description:

LCD pin number 4 (RS) is a Register Selector function to select Register Control or Data Register. The control register is used to configure the LCD. Data registers are used to write data to the memory character LCD display.

LCD pin number 5 (R / W) is used to select the data stream if the READ or WRITE. Because most functions only to read data from the LCD and only need to write data only to the LCD, then the leg is connected to GND (WRITE).

LCD pin number 6 (ENABLE) is used to turn the LCD on the process of writing data to the Registry Control and Data Registers LCD.

Steps by steps to connect the LCD to Arduino:

1) Compose the circuit as shown below on a breadboard.

Running text Arduino Uno with code

Installation Description:
Pin RS (4) connect with the pin 12 pin digital Arduino
Pin E (6 ) connect with the pin 11 pin digital Arduino
Pin D4 (11) connect with pin digital Arduino pin 5
Pin D5 (12) connect with pin digital Arduino pin 4
Pin D6 (13)connect with pin digital Arduino pin 3
D7 pin (14 feet) connect with pin digital Arduino pin 2
Connect the 10 Kohm pot to + 5v and GND and Pin LCD 3 to potentio
Pin 5 (R / W) to Ground

2.) After that connect the Arduino on a Laptop / PC using a serial cable.
3.) Download and Install program on Arduino IDE (If Needed)
4.) Once installed, run the Arduino its program.
 Click the menu "Tools -  Board -Arduino Uno"
6.) Click the menu "Tools - Port -(Select Port arduino detected on your computer)
7.) Then enter Sketch below.


LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
    lcd.begin(16, 2);

void loop() {
  int i;
  lcd.setCursor(0, 0);
  for (i = 0 ; i < 16; i ++) {

8.)Upload the sketch to  Arduino Board

Monday, February 06, 2017

Simple Charging Circuit Monitor with 555 and LM3914

This is a simple charging circuit monitor that indicates whether the battery is being charged or not. This circuit consists of two general IC, transistor NPN, ten led 5mm, and a few discrete components. It can be divided into two parts voltmeter and a display controller. be.low the schematic of simple charging monitor by using IC 555 an LM3914.

simple charging monitorSimple Charging Circuit Monitor with 555 and LM3914
 At the circuit above, the voltmeter is produced by IC LM3914, the voltmeter is about 7V-16V started on LED1 that indicate 7V. And display controller is produced on IC 555 that connected in an astable module with output narrow-pulses. Output IC555 is driven by resistor R5 and R6. If you want blink fastly, use the resistor value R5 and R6 smaller than R7. For voltage calibration using Rv2 and Rv1.

If you want to make it simple charging monitor you can follow this PCB layout design.

PCB layout desing charging monitor circuitcharging indicator circuitPCB Layout charging indicator

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:

Saturday, January 28, 2017

Subwoofer Home Theater Power Amplifier

Subwoofer Home Theater 150W version
Subwoofer Home Theater 150W

Subwoofer Home Theater Amplifier circuit is designed for subwoofer speaker system that used on Subwoofer Home Theater system. This circuit using IC LM324 as a based filtering subwoofer signal input and as a buffer its power amplifier. See the circuit diagram below.

Subwoofer Home Theater Power Amplifier Circuit Diagram

On the circuit subwoofer home theater above, I mentioned earlier IC LM324 as a filtered subwoofer and buffer circuit amplifier. For enhancing subwoofer performance you can be adding Subwoofer Booster Circuit 4558 and adding more Final Transistor Amplifier TIP3055 and TIP2955.  

The subwoofer amplifier circuit is a complete power supply, bridge diode, and Capacitor filter. Voltage Supply about 25V AC from Transformer step down with rating minimal 3 Ampere. Output Power About 100W.

For DIY'ers making Subwoofer Home Theater easier, follow this Layout PCB design.

PCB layout Home Theater Power AmplifierLayout Design for Subwoofer Home Theater Power Amplifier

Subwoofer Home Theater 150W circuit diagram:
Schematic Diagram of Subwoofer Home Theater Circuit
Subwoofer Home Theater Layout PCBSubwoofer Home Theater Layout PCBComponent and PCB for Subwoofer Home Theater

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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