electret microphone amplifier circuit diagram

This is a battery charger circuit that has the advantage of automatically disconnecting the battery when charging is complete. The voltage sensor used in this circuit is the LM301 IC, which serves to disconnect the battery when the charging...

The amplifier circuit is designed as a pre-amplifier configuration. It utilizes transistor Q101 and other components such as inductor L101 and biasing elements. The transistor operates as a common emitter intermediate frequency (IF) amplifier. The IF signal is coupled...

Useful for low-resistance measurements, this 1-A current source will produce 1 A in unknown resistance Rx. For best results, Rc should be less than 1 to 2, because only 3 V are available. Ul is a flyback converter to...

The system includes a gas-sensitive sensor element QM (type QM-N5), a buck rectifier, and regulator circuits, integrated circuits KD28, a speaker Y, and other components. The buck regulator circuit features a transformer rectifier and a bridge rectifier comprising diodes...

The circuit utilizes the configuration illustrated in Figure 1-36, with the feedback circuit and bias circuit implemented separately. The feedback resistor, Rfl, is approximately 30 ohms. To maintain the desired amplification, the resistor R queue is set to 1...

The circuit is designed to operate with an audio power amplifier that uses 18V-0V-18V power rails. The specific voltage is not critical, but the feedback is referenced to an LED chain connected to a 12V rail, necessitating a separate...