Variable modulating 100k resistor for delay.

[acehobojoe]

A delay I am using has a time control, and I was wondering if I could couple the 100k time pot with a resistor that somehow varies at a set rate like vibrato. Anyone ever done this?

[JFace]

You could set up a blinking LED that shines onto a photo resistor. The timing could be controlled by a 555 timer.

[UKToecutter]

Perhaps a vactrol driven by a clock??

[acehobojoe]

ok awesome, could that led also shine for the user to see?

[acehobojoe]

it just needs to be something that ever so slightly modifies the time control. because too much would sound awful.

[acehobojoe]

I was thinking, just a 555 timer adding a little of resistance to the already potted value.

[JFace]

If it was fast enough the "memory" of the photo resistor would be small enough to add in series to a 100k resistor (or whatever value) to achieve the effect you want.