Author Topic: Peak detector  (Read 1388 times)

0 Members and 1 Guest are viewing this topic.

Offline thefatmoop

  • Contributor
  • Posts: 31
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 http://en.wikipedia.org/wiki/Precision_rectifier

but looks like my 4Mhz op amp http://www.adafruit.com/products/808 can only do peak detection up to about 20Khz or so. I'm using a 1N1418 for the diode.

Video demonstrating limitations
http://youtu.be/MzKXaQ6AHoM

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

  • Frequent Contributor
  • **
  • Posts: 422
  • Country: nl
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?
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf