tindle@ms.uky.edu (Ken Tindle) (07/27/89)
I'm having (very unexpected) problems designing a microphone amp circuit. Gain is no problem, per se. Audio I get easily; it's the noise that goes with it I could live without. Now I already know the signal directly off a dynamic mike is small, but evidently the noise floor is close to the audio. I'll have to admit that I don't know enough about the nitty-gritty details of microphone function to understand what is happening. Is there someone out there who's jumped this hurdle in the past, who'd be willing to give me some pointers? --------------------------\ /------------------------------------------ INTERNET:tindle@ms.uky.edu | "I heard you." -Kirk BITNET:tindle@ukma.bitnet | "He simply could not believe his ears." Ken Tindle - Lexington, KY | -Spock, The Trouble With Tribbles --------------------------/ \------------------------------------------
collinge@uvicctr.UVic.ca.UUCP (Doug Collinge) (08/02/89)
In article <12296@s.ms.uky.edu> tindle@ms.uky.edu (Ken Tindle) writes: >I'm having (very unexpected) problems designing a microphone amp circuit. >Audio I get easily; it's the noise that goes with it I could live without. Mic preamps are pretty tricky for several reasons. I suggest that you rip off the preamp design from some existing mixing board. For e.g., the Soundcraft mixers use a pair of discrete transistors as a front end to a TL072 bifet opamp. -- Doug Collinge School of Music, University of Victoria, PO Box 1700, Victoria, B.C., Canada, V8W 2Y2 collinge@uvunix.BITNET decvax!uw-beaver!uvicctr!collinge ubc-vision!uvicctr!collinge __... ...__ _.. . ..._ . __... __. _. .._ ..._._