If it is about EW clones then:
2 x this (as an possible alternative) + plugs + Fred's schematics + soldering skils.
(WARNING! This variant is purely hypothetical and is operable, if adapters have the galvanically isolated outputs. Ask about the adapter' characteristics)
Hello ILYA and everyone,
Busking has always been an interesting idea yet not having the ideal ground available would concern me. Ground affects response precision and sound quality; it is more than just a capacitive loop demonstrated by some.
I always wanted to use a 12 volt battery or even a solar panel, then bring a long ground rod to hammer in the nearby soil to leave it there for next time.
Then I would explore using a product like this pure sine wave inverter. This approach avoids switching noise getting into the sound. The EWS needs less than one watt and a busking amp does not need to be more than 15 watts. When finished I would put the battery back in the automobile and hope it starts. 
Christopher
So California is different from Russia. It is always hot here, we do not need to hand crank our theremins. 
Christopher
IYLA sometimes we think alike, I have cranked it once in awhile. 
Christopher
Beautiful ILYA! Very nice write-up. I bet that hand crank gave you trouble! And the speaker port & horn arrangement is quite elegant. I wonder how hard it would be to have the tuning of the speaker port govern the actual pitch produced? I've seen "electronic trombone" circuits for LED flasher IC LM3909 that did this but I've never built one (ftp://bitsavers.informatik.uni-stuttgart.de/pdf/national/_appNotes/AN-0154.pdf, see page 9).
Was it difficult to get it to read the SD card?
ILYA, I think your project is very beautiful, my method sounds authentic because I can use any pre-recorded track. Once again where is your sound? I think we are faking it in different ways.
dew I loved the LM3909, it took the place of the uni-junction transistor. Have no idea what you are doing with it. At least it is analog. lol
Christopher
There is no tuning Dewster.
All the emitters are equal and can operating in a wide pitch range each. True acoustic 6-voice polyphony. Resonance chambers (including pipes) are used just for bass responce correction. Crank rotation defines the tempo.
Cypress provides the ready-to-use set of routines (so called "User Module") for SD card supporting, including the FAT16. I cracked them for optimization and customizing (standard SD User Module does not support CY8C27xxx parts).
Here is the sound example. A bit of reverb had been added.
"There is no tuning Dewster." - ILYA
Yes, I understand that, just wondering if making it more "accoustically based" might somehow add to the overall effect. But you would be stuck with just 6 notes.
Your sound sample is wonderful! Funny how little polyphony is needed in order to produce a fairly complex sound.
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