Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

(Sorry if this is a dupe- I didn't see it show up)

Hi,

I'm looking for some help with a PCB, and its schematic. I'm not
feeling very confident at the moment.

It comes from a stereo 3-way active crossover, which is twice as many
channels as I need. This send the signal to three amplifiers, not
three speakers. I'm also looking at a couple of little changes as
it's going to be used on an instrument rather than an audio system- 1/
4" jacks instead of RCA, that sort of thing.

I've managed to get the schematic for one channel, and the power
supply, and an image of the stereo PCB. I'm looking for some help
putting the channel and the power supply together, and then onto a
PCB.

It uses three quad op-amp TL074s, and I was also hoping to get some
advice on whether there is anything newer and quiter. Or maybe even
changing this to six quieter op amps (the chip number escapes me
right at this moment - I've got 5534s or similar echoing in my
mind??? My notes are elsewhere!)

I'm not willing to post the info I've got openly yet. While the
design was originally published in a magazine and the PCB is
available on their web site, I'm not too sure about the copyright
status and throwing it open to the group.

If anyone feels like they want to and can help, can you drop me a
line on this email.

Hoping to hear from someone soon,

Cheers,

David.