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

[Roy J. Tellason]

On Wednesday 21 December 2005 12:34 pm, Rutger Vlek wrote:
> 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???

>From Don Lancaster's CMOS Cookbook section on that part under the heading of 
"Some Limitations",  it says:

"The 3130 wors with a supply voltage as low as five volts.  But its upper 
supply-voltage limit is a _total_ of 16 volts -- or half that of a 741 with 
its typical +15-, -15-volt supplies."

Hope this helps...

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