Moog Music Forum

I have four Mooger Fooger pedals and I'm powering them with a Godlyke Powerall (with polarity switching cables).

The prblem is that the ring mod has a constant high frequency ring, whether it's on or off.

I've read that MF's sometimes don't like to be powered from one power supply, do I need seperate power supplies or is it just a carrier breakthrough problem? (I didn't have this problem before when using the ring mod on it's own)

Thanks

Just to add the low pass filter does it too but it only rings when the pedal is on.

If adjusting the frequency knob on your 102 has no effect on the frequency of the ring, then the power supply is the culprit.

Solution: don't use a single power supply to power them all. If space is an issue for you, those 1Spot power supplies might work (one for each moogerfooger, don't daisy chain). Don't quote me on that, though, I've never tried one.

I've got the same problem when i daisy chain them, if i power them on their one it's all fine..

I suspect this is caused by leakage currents. Due to the non-ideal characteristics of analog circuitry, there are small amounts of current leaking out of transistors and ICs and such. When you plug one moogerfooger into the wall or power strip, this leakage current flows harmlessly out of the system into your household ground. The wall-wart power supply prevents leakage from getting back in. However, when you daisy-chain a single power supply or use Powerall type things, these currents flow out of one moogerfooger and into another. In audio circuits, this can manifest itself as squeals and hums.

Thanks for the info guys, some new power supllies should fix it.

i have had the same problem with my ring mod, having just recently got a godlyke powerall, and using a red jumper cord to power the ring mod off the powerall.

what i did notice in the godlyke packaging, was this little statement which may be helpful...

"Note: reverse polarity units must be grounded negative to chassis in order to work in combination with standard polarity units using the same PA-9 supply."

so there's the cause of the problem.

but i don't really want to mess around with my moogerfooger wiring, so i'll just power the moog on it's own adapter (boss) for now, unitl i can figure out a way to power it with the godlyke.

nealescottmooger wrote: "Note: reverse polarity units must be grounded negative to chassis in order to work in combination with standard polarity units using the same PA-9 supply."

Typically, effects units are 9VDC with a negative tip (so a positive ground). Moogerfoogers are "reverse polarity" which makes the tip positive and the ground negative. So you don't need to change any wiring (infact, you can't (easily) because the power connector is mounted to the circuit board).

When I had fewer Moogers, I used to have a normal supply on a daisy with one or two reversed adaptors (wiring the tip to the ground and vice versa of a 2.1mm plug/socket). This allowed me to power a couple of effects with different polarities off the one adaptor.

All they (godlyke) mean is that you can't use a normal polarity device with a reverse polarity (red) jumper; this would short out the supply and cause it to overheat! I know this, because once a guitarist plugged a reverse 9V adaptor into an orig. Ibanez FL-9. "It's not working" he said. The pedal was fine, but it fried the adaptor. Lucky Ibanez used a power diode...

Speaking of diodes, an electrically minded friend suggested inserting diodes to each end of each power plug on the daisy chain. The diodes would block all AC current (and a good proportion of the noise). Although there would be a 0.6V (or thereabouts) voltage drop from each diode, you could rectify this by increasing the voltage at the transformer. Just a thought.