Audio Power Limiter

Posted on Nov 17, 2012

The gain control element is a Light Dependent Resistor (LDR). These are blessed with a few very useful features for our purposes, one of which is low distortion even at quite high signal levels. Being light activated, all we need is a LED to provide illumination when the preset power level is reached.

Audio Power Limiter
Click here to download the full size of the above Circuit.

Once this point is reached, a very small increase in amplifier output voltage (and power) will cause the LED to provide much more light, reducing the value of the LDR, and thus reducing the input voltage. The effect is to keep the level more or less const

Leave Comment

characters left:

New Circuits



Popular Circuits

Op Amp based Hartley oscillator
Robotics Page
power supply variable with lm338
isp flash microcontroller programmer
vhf fm transmitter
led table reading lamp circuit
Build a Miniature High-Rate Speed Control with Battery Eliminator Circuit (BEC)
2 -Y- connection automatic three-speed motor acceleration control circuit