Small Electret Microphone Pre-amplifier

Small Electret Microphone Pre-amplifier
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 to simplify even more by using a single transistor. (more…)

Preamp for Speaker as a Microphone

Preamp for Speaker as a Microphone
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 to use a stable power supply, or solar cells ... (more…)

Mono Preamp Based on NE5534

Mono Preamp Based on NE5534
This achievement shows that it is possible to create a balanced dynamic microphone preamp, it is relatively simple. This preamp is particularly suitable for microphones with an output impedance of 200 ohms to 600 ohms. The advantage of the preamplifier is 50 dB, and bandwidth (-3 dB) extends to about 25 KHz. The splitted power supply is required. (more…)