Category Archives: Audio and Music

Magnetic Phono Cartridges Transistor RIAA Preamp

Posted on July 10, 2011 by Rust

The following two-transistor circuit is a pre-amplifier circuit for magnetic phono cartridge, which is characterized by its frequency response defined by RIAA standard for phono recording. This pre amp circuit  has gain around 40 dB (midband) at 1 kHz. Here … Continue reading →

Posted in Audio and Music | Tagged | Comments Off

High-Impedance Input Hi-Fi Tone Control

Posted on April 21, 2011 by Rend

Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We don’t call the tone of audio signal as red, green or or … Continue reading →

Posted in Audio and Music, Signal Processing | Tagged , | Comments Off

Simple Door Intercom

Posted on April 19, 2011 by Rend

This intercom circuit suitable for accompanying  door bell. This circuit uses the speakers both as microphones and as loudspeaker. This intercom is made simple by using only a single amplifier IC LM390 to serve two-way communication. This circuit is based … Continue reading →

Posted in Audio and Music | Tagged | Comments Off