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 TDA2822 stereo amplifier circuit with pcb

Sunday, September 7th, 2014

This circuit stereo power amplifier. By use integrated circuit number TDA2822 within be model Dual Amp give power watt at 1W +1W bandwidth expansion rates at 40dB 120kHz use power supply since 1.8V to 15volt and use current 6mA feed power supply 9volt reach the circuit C7 will perform filter fire level smoothly then go […]


 How to increase currents of a transformer

Saturday, September 6th, 2014

If your the transformer too low current, until you cannot use fully it. It is a pity if you need buy the new transformer. So let’s look at how to modify it to increase current up. But the transformers must be the center trap type as Figure 1, suppose your circuit need the 9V AC […]


 Simple 12 LED running using CD4017 and NE555

Friday, September 5th, 2014

Here is a simple 12 LED running circuit that use CD4017 and NE555 as based of circuit. It like the two way 12 LED running lights using CD4017 and NE555. Which it use 12 LEDs only. There are a interated running form. To begin with LED flash from the center to the edge on both […]


 Automatic Reverse polarity switch by Relay.

Thursday, September 4th, 2014

This circuit is an automatic reverse polarity switch. If we apply DC voltage to a any electronic circuits in wrong polarity. It can be caused by too much current. You must waste time to reverse the new terminal. If your circuit is importance, let’s build this project to your life will better. How it works […]


 Diode tester circuit using IC-741 and LED

Tuesday, September 2nd, 2014

This diode checker circuit can check the diode the good or bad and also can indicate its polarity. How it works In Figure 1, There are IC1, R1, R2, R3, C1 include as the oscillator circuit that generate the square wave out to pin 6. This signal will be an AC that is symmetrical waveform. […]



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