Useful audio circuits on an Ed-Lab 500?

zonkout · Joined: Oct 12, 2006 Posts: 33 Location: ozztin, teggsitz

So I have a CES Ed-Lab 500 "Exploratory Electronics Trainer" and I would like to know if there are any useful audio-friendly circuits I can milk out of it.
So far I have only run the DC voltage through the photocell and into the VCO input on the oscillator and then used the oscillator to modulate the "buzzer". I think I have enough diodes to make a ring modulator, but am not sure how to patch it up. Any other ideas? Pics below....
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Scott Stites · Posted: Tue Nov 07, 2006 11:30 am Post subject:

Just this weekend I was trimming down my email in-box. I subscribe to a number of lists, and it really stacks up after a while.

Anyway, as coincidence goes, while I was going through my Serge List folder, I ran across a post from this gent selling a couple of Ed-Lab units. Damn things sold in less than 12 hours, and for not a cheap price. Apparently, Sergers (and likely banana-jackers in general) seem to really love these things. Sorry, can't remember which models the guys sold (he had two different models).

Cheers,
Scott

zonkout · Joined: Oct 12, 2006 Posts: 33 Location: ozztin, teggsitz

That FS post on the Serge group was what inspired me to find an Ed-Lab. I am putting together a frankenstein banana modular and thought it might be useful. Sadly, mine is on the low end features-wise.
I should still be able to make some useful circuits though, right?

Scott Stites · Posted: Tue Nov 07, 2006 8:23 pm Post subject:

LOL, your location finally dawned on me. I kept thinking "Do they have Ed-Labs in Tajikistan?"

There might be some interesting stuff you could do with that - processing CV's and so forth. Maybe work a slew generator out of it. I notice those diodes have a 'Ge' next to them....germanium, element of the fuzz Gods. Maybe you can put them in series with an audio signal and cook up some cool distortion?

Or, hook a signal to the collector of one of those transistors, another signal to the base, run a resistor from the emitter to ground and tap off of the emitter just to see what that might sound like. Try things like that - tere may be some interesting possibilities there. Wouldn't work too easily on my synth, though. It missed the banana boat Very Happy

Cheers,
Scott