Pulsar probelms

[Bassybert]

Hi guys

I'm having trouble getting my Pulsar to work. I have wired it as the schematic shows and have some signal going through. When I turn the depth pot, it affects the volume of the signal. The rate pot does nothing at all. Also when the switch is pressed the signal gets loud and then quiet when it is switched of. I can't hear any modulation at all.

Because i'm using log pots are the tabs arranged in a different way than a linear one? I've had trouble understanding the tonepad layout for the pots and have tried various wiring methods. What are the tab layouts for a pot if i'm looking at the bottom with the tabs pointing towards me, and do these correspond with the tonepad layout?

I'm desperate to get this finished as i've heard it before and it sounds great.

Regards

Jim  

[Samuel]

The Tonepad layout shows the pot just as you describe holding it, so with the pot upside down and the tabs facing down, left to right they are numbered 3, 2, 1. So the depth pot is wired with the pads in order from the layout left to right, and the rate pot has 1 and 3 reversed. (On the layout it almost looks like all three are tied together, but in fact the order of pads on the layout from left to right is 1, 2, 3)

Log pots are arranged the same as linear pots.

Hmmm, check your switch wiring perhaps? That behavior sounds a bit suspicious.

[bioroids]

Hi

The schematic at Tonepad has some errors (it has the transistors backwards and a missing wire on the speed pot).

The layout anyway is correct, you should be guided by it, not the schematic. Or else download a corrected schematic (with some addons you can omitt) at my site http://ar.geocities.com/bioroids

Luck!

It is a great sounding tremolo

Miguel

[Bassybert]

Thanks guys, but i've got some queries:

What is the ground tab when looking at the pot from underneath with it pointing towards you. I thought it was the middle one. the left is the wiper and the right is the track. is that true?

Also, i've been using the fulltone (ahem) 3pdt switch wired for true bypass and an led, but i've used the layout mentioned on this forum and wondered, does this layout apply to ALL effects or only certain ones ie. NPN or PNP?

Thanks

Jim

[bioroids]

The wiper is the middle one. The other two arent too important (it will work no matter how you use the 2 outer lugs, but in one case rotating the pot clockwise will increase the effect, and in the other case the same rotation will decrease the effect)

Normally the ground goes to one of the extremes

Luck

Miguel

[Impaler]

I've built this project myself and got it all working, yet the only problems i have is the thing is ticking when the effect is bypassed, and the Rate control is rediculously harsh (Last 1/4 of the turn, rate goes thru the roof). I'm more concerned about the ticking, and seeing this is a Pulsar thread, figgered I'd ask  

[Samuel]

Yeah it seemed to me like a linear pot for the rate would be much more reasonable, but I didn't love the sound enough to keep messing with it, so I pulled all the pots and the IC, etc. off the board...