Low distortion audio gain limiter


Posted on Nov 22, 2012

The level at which the limiter kicks in audio can be adjusted with the selector knob LIMIT LEVEL. When this level is exceeded, the output of the half-LIMITING detector of the op-amp (used as a comparator) turns the LED causes the resistance of the photoresistor to decline rapidly. It is in tum causes the gain of Ie half LIMITED op-amp to decrease.



Low distortion audio gain limiter - image 1
Click here to download the full size of the above Image.

When the signal falls below the desired limit, the light goes out, the resistance of the photocell increases and the gain of the op-amp back to its normal level LIMITED one set by the combination of resistors RI and R2 . A dual polarity power supply (± 12 volts is desirable) is required for the op-amp.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Running Message Display
Electronic Keypad Combination Lock
rem bell circuit
Site news archive - PCB Heaven
Inductive Proximity Sensors
Float Switch Water Level Measurement
Voltage controlled sine wave oscillator
ICL7107 chip digital circuit section 2
Automatic temperature control circuit



Top