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Archives for Theory

PCB Repair

Circuit Board Repairing

Noise Reduction

Tips eliminate audio Noise. NOISE Reduction I will give the reader some tips on how to eliminate the noise in electronic circuits, why it happened, and how to read Noise Reduction specifications. Usually does not make sense to not know, so it was expected that this paper will help those who are trying to make […]

Tips on how to repair electronic devices

Tips on how to repair electronic devices Before the repair of electronic devices we must first know the blocks of the parts, it is very important because by knowing the block, we can easily determine and track the defective component, such as how to find a block of television is a machine we must know […]

simple Tube Amplifier circuit

simple Tube Amplifier circuit using EL34

Rain Water Sensor Circuit

Rain Water Sensor Circuit Rain Water Sensor Circuit using NE555 and TUP2SB178

60W Power Audio Amplifier circuit using LM1875

60W Power Audio Amplifier circuit using LM1875 60W Power Audio Amplifier circuit using LM1875 The following circuit diagram is the 60 Watt power audio amplifier circuit, build based on power amp chip LM1875. The single chip of IC LM1875 is able to amplify the audio power output up to 60W. In this circuit, the two […]

DC power converter

DC power converter 12V DC to 120V DC The most obvious approach would be to make a DC power converter 12V DC to 120V DC, output at 50 or 60 Hz, but this requires a rather large and heavy transformer. So it’s better to use a high frequency, at least 25kHz, so a very small […]

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