Hello to you.

I'm building a simple electronic sound syntetizer.

Basicly It consists of several coupled oscilators, each conected to a key on a key board, that connects the sound to a signal mixer (and amplifier) and finaly to the sound output.

What I would want to accomplish is a fader effect on the key strokes, I mean, when you play a piano key and they take off your finger, the tone will keep going for a few seconds, fading away.

OK so I know how to keep the tone active after you take of your finger (just add a simple Rc timer to keep the signal flowing) , but I dont know how to add the fade out effect.

can you help?

thank you.

 

Hello,

Here is a link for "Music Form Outer Space"
http://www.musicfromouterspace.com/analogsynth.php?page=ANALOG
There you will find several links to parts for a analog synthesizer.
I think you need the ADSR link:
http://www.musicfromouterspace.com/analogsynth/AAA_EnvelopeGenIndex.php?page=ANALOG
This can be used in combination with the VCA.
http://www.musicfromouterspace.com/analogsynth/AAA_VCAmplifierIndex.php?page=ANALOG

Greetings,
Bertus

 

Howdy:

It sounds like what you need is a one shot (monostable multivibrator) followed by an RC time constant. A one-shot is very easy to create with a 555 timer....probably redundant to descibe the circuit, as it's been beaten to death on this forum.

Have you had success in using an RC time constant to create your decay envelope? If so, the addition of the one-shot should be a snap.

Eric

 

Thank you a lot. I spent a lot of time searching for material and studiyng what you gave me.

But I realised I dont really need a complete ADSR.

Is'nt there a much simple way to perform the envelope effect? I dont need the four effect stages (Attack, Decay, Sustain, and release), I just need sustain and realease.

 

Hello,

Did you have a look at the Attack-Release schematic?

http://www.musicfromouterspace.com/analogsynth/ar_new.html

If you do not need to adjust the attack, fix it at one value.

Greetings,
Bertus