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1970's Synthesizer

michaelmartin2758

Nov 25, 2010
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Hi Guys

I was wondering if some one might be able to advise me..

I have a 1970's Synthesizer and the internal power supply has gone.
I'm thinking of replacing rather than repairing
The Synthesizer has +12v -6v -10v rails

I'm thinking of using 3 power supplies
http://www.alliedelec.com/search/productdetail.aspx?SKU=6310019

wired together to produce the minus voltages. I'm a bit confused with the original circuit diagram 60 pages as some parts are labeled 0v and some Ground even though they seem connected.

the question is do i connect the minus to ground.
I have attached the diagram for the psu

Thanking you in advance
And Happy Thanksgiving
 

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barathbushan

Sep 26, 2009
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does the synthesizer have a ground terminal or just +12v -6v -10v rails ??

EDIT : really silly question to ask !!!
 
Last edited:

michaelmartin2758

Nov 25, 2010
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rails

hi

thanks for replying the rails are labelled


Gnd +12 -10v -6v


here is another diagram

thanks again
 

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barathbushan

Sep 26, 2009
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you said that you want to use three power supplies so do this

1) in the first supply set the voltage to 12 v , then connect the '-' terminal to ground , and '+' termainal to +12v rail

2) in the second supply set the voltage to 10 v , then connect the '+' terminal to ground , and '-' termainal to -10v rail

3)in the third supply set the voltage to 6 v , and connect the '+' terminal to ground , and '-' termainal to '- 'v rail
 

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Also ensure that each power supply can supply the current required on each rail.
 
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