[sdiy] Unusual BP filter - Voltage Control

[harrybissell]

Paul Higgins wrote:

> I remember a Craig
> Anderton noise gate design that drove a CLM-6000 with a fairly
> high-level squarewave from a 555 timer; it actually bled through to the
> photocell, at least it did if you subbed a Vactrol VTL5C4 for the
> CLM-6000.  Maybe it was partly a capacitance thing, I have no idea, but
> it was audible and very annoying.  (I designed my own optical gate at
> that point!).

Yes yes YES.   I deal in power electronics... and with a signal that goes
500V/us I got enough capacative coupling to LIGHT AN LED on the other
side of an optocoupler isolation barrier... WITH NO POWER APPLIED TO
THE SECONDARY.

woah !!!

H^) harry