[sdiy] Simple clip detect LED circuit

[Seb Francis]

A nice 1 chip solution would be perfect :)
But looking at the 7555 datasheet I can't see how I would avoid having 
to stick a full wave rectifier in front which then requires additional 
opamps.  I initially thought the THRESHOLD input could be used to detect 
positive peaks and the !TRIGGER input to detect negative peaks, but they 
each give different output states.

Seb


Paul Perry wrote:
> I had a similar application recently & I used a 7555 as a one shot.
> the input triggers the pulse when the threshold is crossed.
> And you have a nice binary output.
>
> paul perry melbournre australia
>
> ----- Original Message ----- 
>   
>> It's to detect clipping on the input of a ADC, so LED needs to be 
>> totally off for below threshold signals, then on for a noticeable amount 
>> of time if the signal exceeds the threshold for even 1 sample (~20us).
>>     
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