ADA Flanger, Controller Question

[alteredsounds]

I'd like to use a controller on my ADA Flanger and am not 100% sure what to use?  From the manual:

Control: A voltage control input that allows direct control of time delay with an externally applied voltage.
The Control input accepts either the ADA Flanger Pedal or a 0Volt to +5 volt control voltage.  Connection should be made with a 3-conductor stereotype cable.   Since the ADA Flanger supplies a ground and an internally generated +5 volts, a pot could be placed across this voltage with the wiper connected as show.

Suggestions welcomed

[Steve Newton]

Just had a look at the ADA Flanger schem and it look like all you need is a 10k linear pot wired up as below. Nice and easy.

[Mark Hammer]

The 10k suggestion WILL work, however the voltage available at the wiper may or may not be appropriate for the job.  Probably a good idea to stick a 10k trimpot between +9v and the input of the footswept pot, and a 100k trimpot in parallel between the wiper and ground lug.  This way you can:
a) assure the voltage is never more than 5vdc, and
b) assure the widest possible coverage of the 0-5v range with your foot movements or at east the most useful coverage of that range.

To set it up. set the foot pedal to max (toe down), and with a fresh battery adjust the 10k trimpot so that you read 5vdc at the wiper lug.  Now, install the parallel 100k trimpot (set to max resistance), and pull the foot-treadle fully back (heel down), again reading the wiper voltage.  This should be close to 0vdc.  If it is much higher than 0v, measure the wiper-to-ground resistance and adjust the trimpot until heel-down gets you a relatively low resistance. You may now have to re-adjust the 10k trimpot a bit.

The general idea is to get you foot-controlled sweep that covers the entire 0-5v range, provding as much wide-sweep capability as the A/DA is known for.

Note that the A/DA, like a great many flangers, has an interactive depth and manual control.  That is, manual adjustment of sweep/delay-time has less impact the higher you've set the depth/width control.  With the automatic sweep set to full, manual has no effect.  To get full benefit of the manual (or foot-controlled) sweep, the depth control must be set to minimum.

[alteredsounds]

Excellent, thanks very much both