Thank you, RG Keen ...

[Liam]

Your pedal looks really interesting, and I'll bet it sounds great...

I'd experiment with other methods, like some kind of JFET switching or maybe a millenium bypass using one of those little keyboard switches (assumming they're quieter).

The millenium bypass was really a workaround the fact that TPDT switches were all but unavailable at the time. I built a few, and they were quiet enough, but it was sometimes hard to avoid either dim glow of the LED when the effect was off, or the LED was slow to come on. If you've already got a TPDT in circuit, there is bound to be some way of getting rid of the switch bounce noise. If you've tried all the resistor tricks, might be time to think about caps. It's only ever an imbalance in DC levels when the switch changed contacts after all.

I'll go away and think about it...

Great thread, got me thinking, thank you!

[martin manning]

What part numbers are used for the chips and diodes? Must be something obvious, but I'm new here.

MPM

[Shea]

What part numbers are used for the chips and diodes? Must be something obvious, but I'm new here.

MPM

No, I didn't label them.

For the diodes, I think I'm using 1N4148s. I guess they're practically interchangeable with 1N914s for this purpose.

For the opamps, I still have to finish trying out different combinations to see what sounds best. So far I've found that it sounds good with a TLO82 for the first two stages and a 4558D for the last two stages, but not the other way around. It sounds a hair better with two OPA2604s, but maybe not enough to justify the price difference. It sounds darker with two 4558Ds.

[Alf]

Shea ,

this looks very promising and the sound you describe makes me more curious.
Hope you don't mind my asking but have you got a pcb design for it as well ?

That would make things a lot easier.

Alf

[Shea]

I do, but I don't have it in an uploadable format now.

[d95err]

The LED can also cause popping. Checkout Jack Orman's article: http://www.muzique.com/lab/led.htm

[Shea]

The LED can also cause popping. Checkout Jack Orman's article: http://www.muzique.com/lab/led.htm

Great tip! I'll have try out that fix. Thanks!

Shea

[Sock Puppet]

Eventually we will all have to use silver solder...

I'm holding out as long as I can so I don't have to get a new soldering iron!

I was poking my nose in last week and tried to use someone's soldering iron with 3% Cu the rest tin solder... what I did for a half an hour was chop pieces of solder up!

I want rosin cored 60/40 whether I grow an extra limb or not.

Might come in handy.

S.

[Alf]

pcb

I do, but I don't have it in an uploadable format now.

Okay that's a pity , then I'll have to get down to it myself .

Thanks for the reply !

Alf