Author Topic: polarity reversal  (Read 6028 times)

kvb

polarity reversal
« on: November 18, 2007, 01:35:33 PM »
this circuit when set up like RG's polarity reverser appears to provide the proper result.

I used an input buffer then 22k input and feedback R with the 1M bias R

kvb

Re: polarity reversal
« Reply #1 on: January 06, 2008, 07:58:37 PM »
well, I'm nearing completion of a certain circuit that employs this DCOA as a polarity reverser. I had this on the breadboard and things seemed to work just fine. Then, when I built it on a board, I was getting an oscillation. After going buggy looking for my mistake, I found the original article and realized that I had not included the bypass cap on the lower 10K R as noted. When I included this cap, one 'mode' was fixed, but then the circuit was misbehaving in its other 'mode'.
I added another bypass cap at the 6.8K R - now things appear to be fine.
« Last Edit: January 06, 2008, 08:00:52 PM by kvb »