Tag Archives: microphone pre amp

Small Electret Microphone Pre-amplifier

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The mic pre amp described here is designed to connect a small electret microphone and uses an integrated circuit type NE5532. As you can see, this scheme is very simple. The use of a dual operational amplifier type NE5532 is a large part in simplicity, although it was quite possible… Read more »

Simple Microphone Pre-amp

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This Simple preamplifier circuit provides sufficient gain to weak audio signals from the microphone. This circuit can also be supplied from the voltage baterry 3 to 9 volts if necessary. Take a note that the microphone used in this pre-amp circuit is electret type. If you are using high fidelity… Read more »

Preamp for Speakers as a Microphone 2

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The previous Preamp for the speakers as a microphone installation is indeed simple, but has virtually no gain. It is quite possible to add a second transistor to fill the gap, as shown in above diagram. Note that the resistor R1 serves as the polarization of the two transistors Q1 and Q2. At the same time, the transistor input matching has become an NPN. Parts list : R1 : 470 R3 :… Read more »

Preamp for Speaker as a Microphone

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This Microphone Preamp circuit shows that it is possible to use the speaker as a microphone, and is specifically designed to beginners because of its simplicity. Power consumption, of about 2mA, allowing the circuit is operated a few hours on a single 9V battery. However, it does not prevent you… Read more »

Microphone Preamplifier based TLC251

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Mic Preamplifier described here is designed for dynamic type microphones, the impedance between 200 ohms and 1 ohm. Its uniqueness lies in the low power consumption, no more than 30 uA in the “worst” case, and make it very portable for this, powered by 1.5 V battery which will allow… Read more »