[sdiy] CA3130S good OP amp for CV summing?

[Mike I]

Jean-pierre - there are a number of potental problems with the CA3130
according to the datasheets. It will burn out if you try to run it on the
normal +/- 15V supplies.  There are schematics for VCOs where it is used
(one is in Hal Chamberlin's book), then it has two Zeners diodes attached to
reduce the supply voltage to +/-7.5V at the pins. The datasheets also
mention a long-term drift problem which was associated with the old
metal-gate BiMOS chips - the offset voltage will gradually change (a few mV,
+/-)  if a steady bias is applied to the inputs for an extended time -
perhaps in a comparator application - the datasheet mentions this is
reversible... not the best chip for precise DC applications.
M.


----- Original Message -----
From: <jean-pierre.desrochers at ville.quebec.qc.ca>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, February 27, 2007 7:44 AM
Subject: [sdiy] CA3130S good OP amp for CV summing?


> I acquired a bunch of NOS RCA CA3130S opamps
> in metal can case:
> http://www.arky.ru/audio/sprav/datasheets/ca3130.pdf
>
> I just wonder if these could do a good summing opamp
> for VCO circuit front end?
>
> Jean-Pierre Desrochers
> technicien en électronique
> Signaux lumineux
> Ville de Québec
>