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Old 7th July 2007, 07:53 PM   #1
packer is offline packer  United Kingdom
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Default Help in identifying ST OP AMP

Hi All,
I have op amps in a circuit marked C934 With the ST Logo
They are in a 8 pin SMD package.

I have tried ST microelectronics website and the usual searches but no avail.

I am desperate for this info, Thanks in advance to all that can help
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Old 7th July 2007, 08:26 PM   #2
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Maybe ....

TS934 rail to rail amp-op ST

MAX934 comparator MAXIM

LMV934 RRIO amp-op NATIONAL

PC934 optocoupler SHARP

MC934 ic MOTOROLA

perhaps a photo can help ...
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Old 7th July 2007, 09:04 PM   #3
packer is offline packer  United Kingdom
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Hi,
Thanks very much for the fast reply, But it's none of the ones you mentioned.

As to a photo it is only a "standard 8 pin surface mount Op Amp in a Bose Car Amplifier

These Op Amps are used as low pass audio filters for the 6 outputs of a Crystal Semiconductor CS4226 DSP processor
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Old 8th July 2007, 09:21 PM   #4
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Hi

the C934 is very hard to find.

On the datasheet of DSP CS4226 suggest to use as amp-op
the MC34074 or MC33078
http://www.cirrus.com/en/pubs/proDat.../CS4226_F4.pdf

I sincerely think that the c934s can be replaced with many equivalent amp-op.
On pcb it is easy to see Supply Pin and I/O pin of old C934
(I think that this is a dual standard SMD amp-op)

bye
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