I have seen a couple clip light circuits online and tested them out and they don't seem to work, what I had in mind was to build a simple circuit with just 2 leds one to show signal and the other for when the signal is clipping I have seen that on amplifiers but the circuits aren't really easy to find online.
I have been checking out some opamp videos as far as I see a voltage follower circuit with a diode and a cap at the output can be used as a clip light detector not sure if it is practical though.
- missing discharge path for C1
- missing current limiting resistor for T1 base current
- TL072 isn't suited for single supply operation
In addition
- what's the intended function of C2/R3?
- what's purpose of R1 and first 1N4148? Seems useless at first sight.
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A reasonable clip monitor should act on both polarities (full wave rectifier), have a precise comparator threshold and extend the comparator signal by a fixed time amount.
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Despite what I suggested previously, here's simple overload detector circuit of a Rane ME60S graphic equalizer. +/-15V OP supply, detecting overload at filter input and output.
With a threshold around 7 - 8 V, the LED lights up already below clipping level.
A true clip detector is at the input and feedback signals of an amplifier.
If you don't have access to the feedback signal, then it is only a level detector, because it can not detect if clipping occurs or not.
True clipping depends on power supply fluctuations, load current...maybe signal frequency if there is a dV/dt limit, that causes similar audible noise and similar spectral errors than a voltage clip.