ODP: 1st hello!

[Roman Sowa]

Hi Arpad,

finally someone from central Europe....

You culd use LDRs with LEDs. I lately had a luck of getting 40 of them
at reasonable price, and they are small too!
I glued them to 3mm high effinciency leds with epoxy. It is cute small
device. Tens of megaohms at dark and 2-6 kohm at 10mA LED current

Intend to use them all over my future synth

VC ADSR? I'm finalizing my design of VC ADDSR (yeah, why not add
another decay) using SSM2164 and too many opamps.
Not tested yet. I can't wait to talk about it to the list.

Roman

> -----Oryginalna wiadomość-----
> Od:	Beszedes Arpad [SMTP:beszedes at cc.u-szeged.hu]
> Wysłano:	9 listopada 1998 13:51
> Do:	synth-diy at mailhost.bpa.nl
> Temat:	1st hello!
> 
> Hello to all the synth enthusiasts!
> 
> I am Arpad Beszedes from Hungary, and I'm building a polyphonic analogue
> synthesizer. I don't now how much is this mailing list active, but I
> hope that someone reads this message!
> 
> And here is my first question:
> My synth is based on the Elektor Formant synthesizer. Currently I am
> designing its polyphonic ADSR. As some of you probably know, the a, d,
> and r phases are accomplished via charging and discharging a 15uF
> electrolitic capacitor through a 1M potentiometer. 
> This is what I would like to replace by a voltage-controlled resistance.
> Could somebody help how to accomplish this?
> My idea is to use a FET as a vc-resistance controlled through the gate.
> (but when the C discharges, the drain-source voltage also falls down,
> and at some point the FET will not conduct anymore). What could be the
> solution?
> Or could somebody share a schematics of a VC ADSR?
>