AD633 Ring Mod PS help.....

[diemilchmann]

I recently got a couple AD633 for use in a ring mod, and the only hard part seems to be the power.... +/- 15V already read other threads about it...
If i dont want to use a charge pump, will it work of on 9V? or is there no way around it

Read this:
http://www.diystompboxes.com/smfforum/index.php?topic=69886.0

Schem:
http://experimentalistsanonymous.com/diy/Schematics/Ring%20Modulators%20and%20Frequency%20Shifters/AD633%20Ring%20Mod%20with%20LFO.jpg

thanks
julian

[maarten]

Datasheet specifies dual supply, minimum 8 volts. The schematic specifies also dual supply --> so you need negative and positive powersupply. You can use 2  batteries @ 9volts if you don't want to use a chargepump; connect the 2 batteries in series and connect this same point to ground - now you have one positive pole (+ 9 volts) and one negative pole (- 9 volts) left on the 2 batteries which you connect to the circuit. Probably this will work well enough, as you are within the powerrange specified. If the result is disappointing (e.g. the effect is there, but weak) you always can resort to making a better powersupply....
Maarten

[Jaicen_solo]

I've experimented with this thing in the past. You can run it off two 9v batteries, but if you want to be able to trim out the bleedthrough (i'm assuming it's a ring-mod), you need to have a steady supply voltage, otherwise your bleedthrough increases as the supply drops closer to ground. Also, the two batteries might not be producing the same voltage, or draining at the same rate, so again you have lop-sided power supply and noise issues.
You could get yourself a center-tapped powersupply fairly easily, but i'd look at a charge pump. GGG has a layout that's compact and will give you exactly what you need. My advice is to cut out the possible headaches!