On all of the ic's, they have a resistor and capacitor in series
between pins 1 & 8, and a capacitor between 5 & 6. All resistors in
this chain are 1.5k, the capacitors change for each circuit.

I'm trying to find some replacement op-amps for an old 810T
oscillator, made by California Instruments Co.

The original part numbers are
CIC 200-1, CIC 200-2, & CIC 200-5

MFG stated they haven't been sold in 20 years, no info or replacements
avaliable.

The circuit itself is just a low frequency stable amplitude oscillator
that outputs 400Hz at 5.000VRMS, so no RF or HF signals to worry
about.

The supply rails for the amplifiers are +15 & -15VDC.

The ICs for the most part seem to have the standard pinout of an 8 pin
op-amp, pin 4 is V-, pin 7 is V+, pin 6 is output, pins 2 is inverting
input, pin 3 is non-inverting input. The other pins are what are
unknown to me.

On all of the ic's, they have a resistor and capacitor in series
between pins 1 & 8, and a capacitor between 5 & 6. All resistors in
this chain are 1.5k, the capacitors change for each circuit. In the
theory section, it states these are for high-frequency roll-off to
stabilize the ic.

The CIC 200-1 is for the Wien Bridge Oscillator. The CIC 200-2 is
used for the Mosfet Modulator (uses a depletion mode Mosfet to reduce
signal and keep amplitude stable), Bandpass Filter, Output amplifier,
and Error Integrator. The CIC 200-5 is used for the AC/DC converter.

The MFG only stated that these components were "selected", so I don't
know what the different part numbers pertain to.

So, I'm trying to find a generic IC that should work for this unit.

All thoughts appreciated, and I can give more info if needed.

Thanks,
Steve Kamego

On Thu, 31 May 2007 23:12:03 GMT, Steve <skamego@hotmaill.com> wrote:

I'm trying to find some replacement op-amps for an old 810T
oscillator, made by California Instruments Co.

The original part numbers are
CIC 200-1, CIC 200-2, & CIC 200-5

MFG stated they haven't been sold in 20 years, no info or replacements
avaliable.

The circuit itself is just a low frequency stable amplitude oscillator
that outputs 400Hz at 5.000VRMS, so no RF or HF signals to worry
about.

The supply rails for the amplifiers are +15 & -15VDC.

The ICs for the most part seem to have the standard pinout of an 8 pin
op-amp, pin 4 is V-, pin 7 is V+, pin 6 is output, pins 2 is inverting
input, pin 3 is non-inverting input. The other pins are what are
unknown to me.

On all of the ic's, they have a resistor and capacitor in series
between pins 1 & 8, and a capacitor between 5 & 6. All resistors in
this chain are 1.5k, the capacitors change for each circuit. In the
theory section, it states these are for high-frequency roll-off to
stabilize the ic.

The CIC 200-1 is for the Wien Bridge Oscillator. The CIC 200-2 is
used for the Mosfet Modulator (uses a depletion mode Mosfet to reduce
signal and keep amplitude stable), Bandpass Filter, Output amplifier,
and Error Integrator. The CIC 200-5 is used for the AC/DC converter.

The MFG only stated that these components were "selected", so I don't
know what the different part numbers pertain to.

So, I'm trying to find a generic IC that should work for this unit.

All thoughts appreciated, and I can give more info if needed.

Thanks,
Steve Kamego


FEDLOG (DOD Parts database) lists the CIC200-2 as a MC1709G (709 Op
amp), selected for 10uV drift per degree Celcius. The other two
aren't listed.

Brian