Posted on Sep 30, 2012

Sound detected by electret microphone MIC1 is fed to IC1`s input through resistor R2, and capacitors Cl and C2. Resistors R2 and R5 determine the overall stage gain, while C2 partially determines the amplifier`s frequency response. To ensure proper operation, use a single-ended power supply. R3 and R4 simulate a null condition equalto half the power supply`s voltage at IC1`s noninverting input. The output of IC1 is transferred to emitter-follower amplifier Ql via volume control R6.

Click here to download the full size of the above Circuit.

The high-Z-in/low-Z-out characteristic of the emitter-follower matches the moderately high-impedance output of IC1 to a low-impedance headphone load.

Leave Comment

characters left:

New Circuits



Popular Circuits

12 volt power supply (7812)
Outband descrambler
Rectangular/Triangular Waveform Converter
Preamplifier + tone control circuit based TDA1524A
Infrared intrusion barrier
Need Help: Wiring LEDs with 2 source voltages
stepper motor controller circuit
200m fm transmitter simple circuit
DZW75-48/5050II input circuit
RF amplifier and filter for 10.7 MHz
Voice remote control switch circuit