[sdiy] Buffered/unbuffered CMOS in Oberheim logic boards

g m montalbano montalbanogm at gmail.com
Wed Aug 8 01:24:34 CEST 2012


I ended up rechipping all of the overhead board and about half of one
of the channel boards, using buffered CMOS -- and the circuit works as
it should.
So, for future reference, in the case of Oberheim 4-voice keyboard
electronics, unbuffered A series chips are not necessary.

~GMM


On Sun, Aug 5, 2012 at 4:43 AM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> On 08/04/2012 10:02 PM, Dave Manley wrote:
>>
>> Unfortunately the answer is probably 'it depends'.  If used strictly for
>> digital functions then using buffered gates is (probably) ok.  If the old
>> timers were doing some oddball analog weirdness only possible with
>> unbuffered gates, then no.  Are there schematics?
>
>
> Some parts of the logic may also depend on the gate delay of individual
> parts for proper operation.
>
> Then again, there are places where you can fit new stuff in without any
> issue at all.
>
> Schematics is available.
>
> Cheers,
> Magnus
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