Author Topic: Peak detector  (Read 1388 times)

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Offline thefatmoop

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Peak detector
« on: May 30, 2013, 01:18:28 pm »
Hey everyone,

I'm trying to make a peak detector to detect the maximum amplitude of a 1kHz to 100kHz - possibly up to 500kHz sine wave. I followed the peak detection circuit here

but looks like my 4Mhz op amp can only do peak detection up to about 20Khz or so. I'm using a 1N1418 for the diode.

Video demonstrating limitations

So looks like I need an op amp with more bandwidth. If that's the case, does anyone know of a good/semi cheap 8pin DIP MOS (single rail psu) op amp to do the job?
« Last Edit: May 30, 2013, 01:37:28 pm by thefatmoop »

Offline qno

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Re: Peak detector
« Reply #2 on: May 30, 2013, 02:12:48 pm »
Use the improved version from Wikipedia.
It will have higher bandwith and ledd slew rate limits.
Why spend money I don't have on things I don't need to impress people I don't like?

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