Automatic Fader Circuit

Posted on Mar 30, 2013

In this circuit, audio fed to the control channel is amplified and rectified by Dl and D2. This dc level activates LED D3 via Q2. The light from D3 causes R9, a light-dependent resistor to decrease resistance. As Rll (audio gain) is set higher, more audio is present at the output of Ql. Audio fed into J2 is shunted to ground via R9 and less of this audio appears at J3.

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

Therefore, audio at Jl controls the audio level fed to J3 from J2 andjproduces a fade effect.

Leave Comment

characters left:

New Circuits



Popular Circuits

Toggle Switch with relay
AM loop antenna project
Class A 40W into 8 Ohms Amplifier
Digital Altimeter Circuit
mini and simple power amplifier
Arduino Ping
Automotive Wiring Diagrams
led photo sensor circuit
AM Receivers
RIAA Corrector
Voice Bandwidth Filter
Power Supply Unit
One simple second pulse source circuit