[sdiy] Pulser & Ring Mod PCBs from by Music Easel adaptations available; New Year's Eve Special

[lanterma at ece.gatech.edu]

So, I was able to squeeze out a little bit of time over break to finish off to do some building & testing of my Buchla Music Easel adaptations.

1) I am pleased to say that Revision 1 of the Pulser & Inverter board works! My pulser pulses! It just works, no jumpering or trace cutting or other crazyness is necessary. It's a fun CV source; the pulse rate itself is CV controllable, and it can go way up into the audio range.

2) I haven't had time to finish testing Revision 1 of the Balanced Modulator myself, but a kind, hard-working beta tester put it together and send in the following bug report:

"The VCA and crossfader circuits both worked perfectly right away but the balanced modulator was giving me trouble until right now. While most of the pin swaps happened correctly, pin 6 of IC 2  was coupled to the LED of vactrol 3 rather than the junction of the photocells of vactrols 3 and 4. I cut the errant trace and installed a couple of jumpers and I now have a functional balanced modulator. The circuit works well with TL072. Thanks for following up. I have only played with the ring mod for about 5 seconds, but I already love the ancillary circuits."

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Here are the docs of the original "Rev 0" boards:

http://users.ece.gatech.edu/~lanterma/buchla/boards/mea_pulser

http://users.ece.gatech.edu/~lanterma/buchla/boards/mea_balmod

I will get some "Rev 1" docs up soon. Most of it will be the same; the basic difference, of course, will be in the "Errors" section.

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I've got seven of each of the above sitting on my bench, wanting some love.

$15 for a Pulser Rev 1 board. $10 for a Balanced Mod Rev 1 board (a fully working revision of this, if such ever happens, will go for $20, so I'm giving a 50% discount on these since they require the cutting and jumpering mentioned above; they're also a bit of a risk since I haven't had time to test it myself).

$4 flat shipping + handling, to wherever.

NEW YEAR'S EVE SPECIAL: Order at least one of each by midnight, and get free shipping + handling!

E-mail me telling me how many of each you want, and then I will give you the heads up to paypal me. I don't have many of each, so I want to make sure I have boards left in the stack before you paypal me.

- Aaron

P.S. Sorry I don't have any idea when I'll do a yet another revision of the ring mod board to fix the above bug...

P.P.S. Yes, I do plan to do another pcbcart run, with LPGs, Envelope Detectors, Preamps & Envelope Detectors, Pulsers, and who knows what else. I will announce in the usual places when that happens.