Homebrew PCBs

I am fiddling with a 2-way active filter with options like phaseshift on the LP-filter and adjustable Q.
I am using standard dual OPAMPs from BB-  OPA2134. Not top of the top but enough good to be used in audio equipment.

The idea is to make one PCB with the filter and keep the PSU separated - different chassis to keep noise and hum down.


/M

  ----- Original Message ----- 
  From: david.mcauliffe@... 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, December 03, 2006 10:47 AM
  Subject: [Homebrew_PCBs] Assistance with schematic and pcb- 3way active crossover


  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.


   

[Non-text portions of this message have been removed]