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Recent New Posts


 Low noise tape head preamplifier

Sunday, August 31st, 2014

This is a low noise tape head preamplifier that good sound quality. Because use LM387N that is the low noise ICs and is designed for the specific preamplifier. Figure 1 is Circuit diagram of this project. Maximum the output at 1 volts which is is high enough to drive easily the high power amplifier. The […]


 Simple variable dc power supply 0-30V 2A for beginners

Saturday, August 30th, 2014

If you are beginners who want to use the simple variable DC power supply 0-30V 2A. This circuit is best for you. Because it has a few parts,small,and cheapest than others circuit that same power. The features of this handset is the DC voltage continuously from 0-30 volts and apply current up to 2 amperes […]


 200 watts super bridge power amplifiers

Thursday, August 28th, 2014

This is a 200 watts super bridge power amplifiers, include the transistors as based of circuit, so suitable for signals from the bass guitar. It’s a high power, durable and cheap. Use it in the house, the sound quality also is good. In Figure 1 we will see that the circuit consists of two section. […]


 Active microphone preamplifier using LF356

Tuesday, August 26th, 2014

This is an active microphone preamplifier circuit for the particular condenser microphone. Generally, the condenser microphone has high sensitivity and the high output signal more than the other types microphone, but this type need to have a power supply. How it works In Figure 1 is circuit diagram of this project. The condenser microphone M1 […]


 LF356 JFET Input Operational Amplifiers

Monday, August 25th, 2014

LF155/LF156/LF256/LF257/LF355/LF356/LF357 FET Input Operational Amplifiers These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET Technology). These amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, coupled with offset adjust which does not degrade drift […]



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