Help in identifying ST OP AMP

packer · 7th July 2007, 08:53 PM

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

Gold_xyz · 7th July 2007, 09:26 PM

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 ...

packer · 7th July 2007, 10:04 PM

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

Gold_xyz · 8th July 2007, 10:21 PM

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

7th July 2007, 08:53 PM	#1
packer diyAudio Member Join Date: Oct 2006	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

7th July 2007, 09:26 PM	#2
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	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 ... __________________ My English originates from here

8th July 2007, 10:21 PM	#4
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	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 __________________ My English originates from here

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7th July 2007, 10:04 PM	#3
packer diyAudio Member Join Date: Oct 2006	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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