simple mic pre-amp based LM358

Posted on Feb 4, 2014

Here the simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple, inexpensive and easy to built. Component Parts List: R1, R3, R4 = 10K R2 = 1K R5 = 100K-1M Potensiometer C1 = 0. 1uF C2 = 4. 7uF/16V IC1 = LM358 dual op-amp single supply Mic = Electret Microphone. The following diagram is the circuit diagram of tu

simple mic pre-amp based LM358
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be mic pre amplifier 12AX7. This circuit is little hard to built. You must have an intermediate or advanced skills to build this circuit. All capacitors with value of 33uF are 16V, while the all others are 50V unless marked otherwise. Resistors marked with "#" are 1%. The circuit below is a Dynamic Mic Compressor circuit is simple but the results are quite satisfactory. Audio output sounded outstanding. The principle of this circuit is very simple, the first transistor is used as Mic Pre-Amp. Then a second transistor used as a buffer. And the third transistor is a feedback circuit. Supply voltage. This is a simple audio Pre-Amplifier with single transistor 2N3904. This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that`s very sensitive to sound. This circuit consume low current supply (about 2mA), so will have a long battery life for supplying the circuit. The circuit built based on a low noise, high gain two stage PNP and NPN transistor amplifier, using DC negative feedback through R6 to stabilize the working conditions quite precisely. Below is a mic compressor circuit that uses transistors as active components. VR1 and VR 2 is used to control the tone from the microphone, while VR3 and VR4 strengthening works to control the audio signal in the compressor mic. C10 must be used in this circuit. The circuit I got from my local...

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