Quad Eight 2520 style gain block ....PCB Help
« on: November 29, 2007, 03:29:35 PM »
Hi all,
been fiddling with a Quad Eight EQ PCB and thought about making the gain stage
"pluggable" so i came up with a rough design for the "classic" Q8 gain stage on a 2520 style board. Note that the Q8 usually uses +/- 24v or +/- 28v

Fist question is, how does it look? anything i should specifically stay away from as far as component placement? Already have some ideas to make it better.

Board is looking from the top down,
Left side is + then - (top to bottom)
right side is Out, V-, C, V+ (top to bottom)

also, where does one buy the pins to go into the board? and is the female also available to make it truly pluggable?

PCB--(can't get the pic to just load...any suggestions?)
http://img.villagephotos.com/p/2007-11/1288762/Q82520.jpg


Orignal Q8 gain stage (Mic pre is very similar to the API 312)

http://img.villagephotos.com/p/2007-11/1288762/q8_micpre.jpg


Ptownkid

Quad Eight 2520 style gain block ....PCB Help
« Reply #1 on: November 29, 2007, 03:55:18 PM »
check digikey.com

millmax pins and sockets

part numbers

ed5021-nd
ed5052-nd

Quad Eight 2520 style gain block ....PCB Help
« Reply #2 on: November 29, 2007, 04:30:18 PM »
Hi P,
i found the MillMax stuff on Digikey, but the part #'s don't seen to work when i punch them in and i can't find them on the catalog pages.
are they special order?

Might you know the dimensions? i could look for equivalents in the catalog

thanks

Ptownkid

Quad Eight 2520 style gain block ....PCB Help
« Reply #3 on: November 29, 2007, 04:49:18 PM »
oops :oops: , i fixed the numbers for you.

peterc

Quad Eight 2520 style gain block ....PCB Help
« Reply #4 on: November 30, 2007, 12:52:13 AM »
Be careful with the spacing of the metal can transistors, there might be a problem if the cans touch. Not sure if the drawing is to scale.

Peter
If opportunity doesn't knock, build a door.

Quad Eight 2520 style gain block ....PCB Help
« Reply #5 on: November 30, 2007, 01:31:26 AM »
thanks peter,

it's just a rough idea for now, i don't have exact sizes yet
the pc i'm using is a piece of junk and i can't get much to run on it
(i'm a mac guy) So that pcb design was made using pcb123 software which is only ok at best


 

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