About The Circuit
Clipping is one of the main problems that causes distortion in amplifiers. It causes the amplitude level of a waveform to drop suddenly before it reaches the limit that it was supposed to reach. Well, here is a simple circuit that will help to detect the clipping in a waveform. The clipping can be identified as an LED is kept as the alert indicator when a clipping occours.
This circuit will show correct accuracy if you are able to make it on a high quality PCB. The circuit is mainly based on the working of two operational amplifers (TL 082) inside IC1. They act as window comparators. All it does is to detect the input signal and find out its positive or negative peak value. Correct calibration of the circuit can be done with the POT R5, while POT R1 has to be adjusted to the level at which the LED is supposed to glow.
As we can see Diodes D1 and D2 are connected to the output of the operational amplifier. They are used to drive the transistor Q1 which further drives the LED to glow. A very small time delay is induced by the capacitor C5 so as to identify rapid as well as short peaks. The circuit will easily work with the help of a 9 Volt battery. The circuit is very useful and can be used on all types of power amplifiers, pre-amplifiers and mixers.