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A voltage divider won't work, because it must draw more current than the load it has to feed. Lot of battery life wasted. Now, what is exactly the question? Is it how to switch two different voltages, or is it how do I produce 4V out of a 9V battery? The former is simple, use a SPDT switch, the...

Since the diodes are always switched in pairs, you could use only 5 switches, unless you want to experiment with half-wave clipping.

Thanks! So it seems the Acetylene is a faithful repro of the original. It would be interesting to have hands on experience of a real one, but I think being both clean and quiet is difficult.

OK, problem solved. I don't know how the original ACE something fares, but the Acetylene input stage has too much gain, so the input signal must be attenuated by about 20dB _ via the 1Meg trimmer - for it to run clean, which results in increasing the apparent noise. I solved the problem by...

I don't want gain, I want get rid of noise.

OK, found the issue. The input stage uses voltage-to-current NFB, which reduces considerably its input impedance, to about 10kohm. In order to get a workable gain, the input trim was at about mid-rotation, which results in 34dB attenuation of the input signal before reaching the input stage. Of...

Yes. I'm a professional audio designer, so I know everything about grounding and shielding. Noise here is pure hiss, no hum.

I just finished building the Acetylene and i find it's quite noisy, whatever the combination of gain, volume or headroom. I'm not sure a BS170 is a good choice for a low-noise input stage... Anyone has noticed that?

That's a very common comment when the setup is not correct. A Bigsby should be set up professionally.

I have installed Bidsby's with the Vibramate adapter on Les Pauls (gold-top with P90's and three DC's). It works like a charm. However my most recent installs have been with a Goldo/Rockinger/Duesenberg Les Trem...

Q: "how does the sound change when you alter the setting on the trim pot?" A: Not much, except at the very end of the trimmer rotation, where it seems to act as expected, but not very convincingly. That's my concern, since I think there may be a better operating point if the control range was...

The title almost says it all. I have set the bias so that the signal is greatly attenuated, but I would like to know if there is a more scientific procedure. I have a scope, gen, millivoltmeter. The trimmer is very near the top of its travel. Thanks