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preamp pointers
preamp pointers
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Old 18th April 2004, 03:24 AM   #1
name773 is offline name773  United States
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Join Date: Jul 2003
Default preamp pointers


i'm "designing" a preamp to select one of four stereo input and send it A: to two cmoy amps (chip, i know), then blend the stereo signal to mono and cut it off to below 80hz and send that to a subwoofer amp (the esp p27 power amplifier). B: to a selector that will send the stereo signal to either a headphone amp (still working on it) or a stereo power amplifier. the goal is to allow the subwoofer and main amplifiers to be on at the same time
schematic one
schematic two
schematic one is the ps/amp, and schematic two is the channel selector. it helps to open both at once

the cicuit looks sorta ok to me, but i'm sure somethings wrong with the resistor values/layout/etc. any help is much appreciated. thanks!
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Old 24th April 2004, 06:43 PM   #2
name773 is offline name773  United States
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Join Date: Jul 2003
specifically in schematic two where i use 1k resistors to send a line level signal to two amps, is that ok?
one amplifier is my integrated amp (technics sa-ex110) and the other is the modified cmoy amp in schematic one
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