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 Forum index » DIY Hardware and Software » YuSynth
Substitute SSM2220 on VC-Quad-LFO
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kindredlost



Joined: Mar 02, 2011
Posts: 22
Location: usa
PostPosted: Tue Apr 12, 2011 10:35 am    Post subject: Substitute SSM2220 on VC-Quad-LFO Reply with quote  Mark this post and the followings unread
Here is a pdf layout of a modified PCB for the VC-Quad-LFO.

This mod uses the SSM2220 matched PNP chip (minus pins 4 & 5) in a 6 pin socket on the PCB. The pads are mirrored now instead of flipped as is the case on discreet transistors.

This is (maybe) a substitute for the matched pairs of BC557C's.

Is this a workable solution? I'd like to know before I etch a board. I'm no EE.

SSM2220 datasheet:
http://users.ece.gatech.edu/~lanterma/sdiy/datasheets/transistors/ssm2220.pdf

Quad-LFO-V3-pcb.pdf
 Description:
re-route pin layout for SSM2220 matched PNP's

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 Filename:  Quad-LFO-V3-pcb.pdf
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yusynth



Joined: Nov 24, 2005
Posts: 1314
Location: France
PostPosted: Tue Apr 12, 2011 2:48 pm    Post subject: Reply with quote  Mark this post and the followings unread
It should but probably it will be necessary to increase the value of R7 ( up to 100K I guess, this has to be tried up).
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