[sdiy] Mistake in Prophet T8 schematics? CEM3360 with -15V supply?

Michael E Caloroso mec.forumreader at gmail.com
Tue Apr 2 06:41:39 CEST 2019

That may hardly be the only error.  I stopped taking schematics for
granted years ago.


On 3/31/19, Tom Wiltshire <tom at electricdruid.net> wrote:
> I’ve just been hunting through a few one schematics to see what supplies
> people have used with the CEM3360 dual VCA chip. This is a useful chip and
> not quite as big and complicated as its posher brother the CEM3330. But it’s
> weakness is that you can’t use it with +/-15V supplies. +/-12V is ok.
> Most synths that used it with +15V reduced the negative voltage as suggested
> in the datasheet. MemoryMoog uses -7.5V, others mostly use -5V.
> However, if you believe the Prophet T8 voice schematics, they’ve used -15V.
> I think this is an error. The main output board. Where another 3360 is used
> to control the output volume shows the chip running on +15/-5V, so I doubt
> the voice boards are different.
> If anyone has the lid open on a Prophet T8 at some point, I’d appreciate a
> confirmation that there’s -5V on pin 7 and not -15V as per the schematic,
> just to know for sure.
> Thanks!
> Tom
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>        Electric Druid
> Synth & Stompbox DIY
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