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I think your regulator is not working properly. Look at your voltage on pin8 of the TL072 - it should be about 9v (assuming you have a 9v supply). Also, your voltage into the regulator is less than 7v.

Could be the pinout of that regulator is not the same as the 7805 the PCB is designed for.

Yeah, pin7 on IC5 seems like it's low. Gain1 and Bias2 are somewhat interactive, but, you should be able to dial in the delay signal with the gain mostly off and then just working on Bias2 (you should be audio probing either pins 3 or 4 of IC5 when you do this).

If you are still not getting delay signal, then I would look real carefully at your solder connections on IC5 and confirm you have the correct values for the two trimmers (100k) and the values for R29 and R28.

Let us know what you find.

Did you try re-biasing the second BBD? It sounds like it's just not passing delay. Since you have input on pin7 and no output, I say either a bias or possibly bad IC. Are the voltages on pin5 and pin1 the same as the first BBD that is working?

You sure can! Just make sure you use an On/On/On DPDT.

Shoot, we probably have enough brain power on this forum to actually BUILD a space ship!

Well, I am not sure about a space ship, but many years ago me and 2 buddies put together a 777 sim



All of that building and I never was any good at flying.

Looking very good, DuctTape! That Poindexter is very susceptible to RF and other noise sources, for sure. I remember testing mine on the breadboard and getting massive noise, which then disappeared after turning off a single non-incandescent light.

And, love the light up knobs, too.

Shoot, we probably have enough brain power on this forum to actually BUILD a space ship!

Wow, that is tight! Clean enough to eat off. Super work.

What's the current rating on you 18.6v supply?

These are the feature lists (to summarize) I'm considering:

Baby board (1590A) - 2 stages, simple LFO
Lite (1590B) - 4 stages, simple LFO - can build either a phaser or something similar to the Faux Vibe
Regular (1590BB) - 6 stages, rotary stage OR regen selector, Univibe switch, Maestro LFO
Deluxe (1590D?) - 12 stages, rotary stage AND regen selector, Molten Voltage MV-55 implementation, plus an alternate LFO with added controls (maybe a mash up between the Maestro and Tremulus Lune).

This stuff isn't for sure....just possibilities. But, it's also kind of an outline of what I'd like to do with a few different projects- multiple version with different features to meet the needs of the builder, i.e. taking a core design and then offering different versions with progressively complex features. Some folks may want a simple phaser in a 1590B, some may want a space ship.

I think what will happen here is that there will be two versions. The first version will be either 6 or 8 stages and maybe have a couple fun things. The second version will be the "deluxe" which has all the features I WANT to put in it, but cannot fit in a 1590BB. This would include more stages (12), stage selector AND regen path selector, more LFO controls and onboard circuitry for a Molten Voltage control. Obviously ver2 is going to take more time to develop, and be a much more intense build, so I will shoot for the "lite" version now and follow-up in a couple of months with the deluxe super duper phaser pooper. Maybe a super light 1590B version, too, and mega ultra two stage 1590A.

Why design something once when you can do it four times? Bah!

At which point does the hiss get introduced? Have you tried checking it out with an audio probe?

No, but I absolutely love the look.

Paul, I'm so glad you are pleased! The wah sounds great.

If it's okay with you, can I add your suggested mods to the doc? I would like to give a small warning that the Freq control might not suit everyone, and let them know what you found.

That's an interesting point and I am admittedly kind of ignorant about it. How exactly does noise propagate through a circuit by virtue of component make-up? My gut feeling is that it is probably additive to a degree, IOW, if you use a lot of components prone to a higher noise floor, the resultant THD, or whatever, would be pretty close to a linear sum.

But, I'm no EE.