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Recent content by allison_r

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    Looking for audio circuit designer (preamp and AGC or compressor plus high pass)

    Hello, I'm looking for somebody who can design 2 working preamp circuits with an included switchable AGC (or compressor), a switchable high pass filter and < 18 V working voltage (possibly from a single battery source, ideally 4x Li-ion batteries 3.7 V). I already have the basic preamp...
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    Help with mic preamp and AGC

    I see, thank you. Is there anybody you'd suggest hiring to design this circuit? Allison - - - Updated - - - Edit: I've been suggested this circuit for the piezo input: It is nice because it includes a high pass filter (yet no AGC or compressor). It uses two 12V batteries. Could I use...
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    Help with mic preamp and AGC

    I don't use it yet because I'd have to also double the recording disk space and/or number of recorders used at the same time (unless being able to set different gains on stereo recordings for L/R channels). That'd be a nice solution too. Really, given my ignorance in circuits design I can't be...
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    Help with mic preamp and AGC

    Thank you Brad, one of the digital recorders I own has AGC too, however my AGC idea was that it would serve to set gain directly on the low noise low distortion preamp to benefit from its performance, since (I may be wrong), setting an AGC after the preamp would involve another amp (probably a...
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    Help with mic preamp and AGC

    Thank you for your replies. For the piezo-based one I'm expecting fishes and marine mammals vocalizations, while for the electret array or RF-condenser based, I'm expecting mostly (but not limited to) bird songs (both night and day), wolves, deer. They'd basically log everything so that I can...
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    Help with mic preamp and AGC

    Hello, I'd like to build a few mic preamps for my field recordings which usually involve low background noise and low sound levels, I can solder by following circuit drawings however I am not able to design them. I thought I'd benefit from using a low noise high gain preamp with AGC and a...
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