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Title: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: Steve - K4HX on September 06, 2015, 10:51:23 PM From David, WA7JHZ
Attached is a GIF schematic of my so-called compressor microphone circuit. It does AGC, peak limiting, and compression all in a simple and low-cost package. My last one is mounted in an Altoids mint can. I also have a 600-Ohm balanced output version. My friend, Arne (W7TRO) uses one to drive his Bauer 707. You can build one in about two hours, and I have been wiring them on a Radio Shack 276-150 prototype board (no longer carried by RS). I've built over a dozen of them with similar results. Title: Re: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: K5IIA on September 07, 2015, 01:56:27 AM Man its late, and i may be asking something that is right there in my face, but i see the pot for modulation. Is there any adjustment for agc and the peak limiting.. i guess the peak limiting would be the mod pot but just wanting to clear it up for me. if there is no adjustment what is the max gain that the agc will give to lower level audio below the mod level set with pot. Hope some of this came out in English. lol
Title: Re: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: PA0NVD on March 04, 2018, 03:15:02 PM Hi Steve
Thanks for the schematic diagram. But I only see AGC, and depending at the speed, (the cap // to the gate), it may compress. But where is the peak limiting? Title: Re: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: M0VRF on March 06, 2018, 11:50:43 AM The SSM2167 was invented for such use....
Title: Re: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: Steve - K4HX on March 06, 2018, 03:21:01 PM Not my circuit, so I can't comment. Contact WA7JHZ.
Title: Re: Simple, Low-cost Mic Amp and Compressor by WA7JHZ Post by: PA0NVD on March 06, 2018, 05:21:37 PM The SSM2167 was invented for such use.... Thanks for the part number, nice circuit!! |