[sdiy] CA3130 in Polyfusion Noise module...should a new one work?

[HA.Synth at t-online.de]

The  CA3130 is designed for unsymetric supply voltage. The schemo looks OK. 
The maximum voltage between +Ub and - Ub is 16V. If you tried it with more 
then +-8V symetrical then the OpAmp may be gone.  The negativ input voltage 
must not exceed -0,5V under -Ub at pin 4. The 3130 has problems with 
capacitiv load. I looked this up in an old book. The suffix E is not noted 
here. 

Try to replace it with a normal OpAmp (use symmetrical supply) to ensure that 
everithing else is working fine.

Measure the input voltage/signal. If it exceeds -0,5V then this should be your 
problem and damages the 3130

HA


Am Mittwoch 21 Dezember 2005 18:34 schrieb Rutger Vlek:
> I was just wondering about the CA3130 op-amp. Has it changed since it was
> first produced? I'm doing a remake of a Polyfusion Noise module and in the
> first gain stage after the noise generating Diode (or transistor in my
> case) a CA3130 is used. But in the schematics I found on internet
> (synthfool.com) the CA3130 is powered with only +V and not with -V. Instead
> pin 4 is connected to Ground.
>
> In my remake I couldn't get the CA3130 to work...and I don't know why.
> Signal is going in, and the signal path after the output pin is correct
> too, but somehow my Op-Amp won't amplify. That's very strange. In the
> current datasheets on internet about the CA3130E by Intersil i read that it
> does need a +V and -V, but when i tried it the chip ran very hot and
> probably died. So i had to buy new ones.
>
> Is the op-amp configuration in the schematic
> (http://www.synthfool.com/schematics/polynoise.gif) still working with the
> newer CA3130's???
>
> Regards,
>
> Rutger