AGC circuit using photo resistor feedback.

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From: Brad Mitchel (mitchell@dtcs70.dtc.Kodak.COM)
Date: Tue Jun 06 1995 - 14:01:01 EDT


I saw a circuit in a book that was given to me that
used a photo resistor that was illuminated more with more audio output.
The resistor is the feedback resistor in a 741 non-inverting configuration.
The premise is that the more output, the more illumination, thus reducing the
gain of the amp. Also, the properties of the photo resistor are such that
it provides for quick attack response, and slow decay response.
Just a novel circuit that I thought may be of interest to the group.

73
 -----------------
| ___ ________ | Bradley S. Mitchell Senior Project Development Engineer
| | / / | | Eastman Kodak Company
| | / / | | KEMD Electronic Products
| |< < K O D A K| | Circuit Board Assembly Dept. 606 Test Engineering
| | \ \ | | 901 Elmgrove Road Rochester, N.Y. 14653-5211
| |__\ \________| | (716) 726-5775, FAX (716) 726-7109
| | INTERNET: bmitchel@kodak.com
 ----------------- Amateur Radio Callsign WB8YGG


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