[sdiy] LAG circuit de-tuning VCO question

[Dave Kendall]

Hi Neil.

On Nov 5, 2011, at 07:48, Neil Johnson wrote:
> What op-amps are you using?

TL072s. With the new caps, they seem to be OK, but maybe I should 
consider LT1013s or similar?
I need to bite the bullet and get a load for CV summing jobs....

> Well yes leakage for an aluminium electrolytic is typically quite 
> high.  For example, looking at a basic aluminium electrolytic from 
> Rapid (part 11-3680) the leakage current is specified at max.3uA.
>
> 3uA through 1M0 is 3V.

Wow - that's scary....  I'll have to remember that for the future.

Thanks,
Dave