preamp pointers

name773 · 18th April 2004, 02:24 AM

hi,

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!

name773 · 24th April 2004, 05:43 PM

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

18th April 2004, 02:24 AM	#1
name773 diyAudio Member Join Date: Jul 2003	preamp pointers hi, 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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24th April 2004, 05:43 PM	#2
name773 diyAudio Member 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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