Neo Vibe power

[Mcentee2]

I've read through the forum on the neovibe, and scanned the info in RGs and GGG pdf docs.

The Neovibe I have just picked up seems to have its power supply wired up across PCB points O and J, rather than K and J.

The +ve is to J, and ground is to O - which I think is PCB ground anyway - , so only the positive side is going into the DB103 rectifier.

So...

Is this still ok, or for any reason not?

Does the voltage supplied to the LFO/Bulb still have it's diode drop(s), if so how many/much?

More generally, if I rewire to terminate on J and K, both sides of the rectifier, and can then choose AC or DC PSU, is it better to have a higher than 18v DC PSU, say 24v to account for the drop?

If it's an 18v AC, then IIRC it will end up a couple volts more anyway.

Either way, seems the supply to the audio side is regulated to 15v anyway.

[Mcentee2]

Oops, replied to myself by mistake!

[Kevin Mitchell]

Forgive me if I'm confused, but doesn't that make it a half wave rectifier? With DC there would actually be less voltage drop. With AC there would be a slight drop.

The drawing suggests >17 volts for the lamp. I wouldn't stray too far from that without taking the lamps rating into consideration.

[Mcentee2]

Forgive me if I'm confused, but doesn't that make it a half wave rectifier? With DC there would actually be less voltage drop. With AC there would be a slight drop.

The drawing suggests >17 volts for the lamp. I wouldn't stray too far from that without taking the lamps rating into consideration.

Not as confused as me

When it arrives I'll take a close look and measure with a DMM what is going on re voltages, but am more interested in that pair of connections before I even plug the PSU in!!

[Mcentee2]

So now I'm trying to find a suitable 24v DC PSU.

The only one I can find is the EHX, but that is only 100ma - is this enough current to power the Neovibe ?

[Kevin Mitchell]

I want to say yes. The last one I had built was fed 9 volts DC rated at 100ma to a LT1054 charge pump - worked perfectly fine. Perhaps it depends on the current draw of the lamp used.