Wednesday, July 17, 2013

Simple ASR

Firstly, THANK YOU! Today this blog broke 18,000 views. That's pretty epic considering what this blog is about. Now on to the subject at hand...

So in my random bout of wanting to solve electronics puzzles at 3am (which I am finding is happening a lot recently), I did something neat and simple: made a simple, no-nonsense ASR envelope generator. I'll give credit where it's due: this is VERY loosely based on not liking how complex Hex Inverter's Postman EG is and thinking of ways to make it simpler. Simple is kinda what we do over here, if you haven't noticed.

Alas, it turns out there aren't many ways to simplify the Postman EG, mainly because it's already a fairly simple device. So instead, I just standardised some values (aka parts I have on hand), removed features that don't really need to be there, and adjusted things to work right with as few parts as possible, yet still giving the features I wanted. So, I came up with this:

Gate in, Attack, Sustain, and Release controls, LED indicator, and normal and inverted outputs. It doesn't get much simpler. And really, you could even ditch the Sustain control, LED, and inverter, and just end up with a REALLY simple AR generator. Or, you could add a manual gate button, maybe a loop function (pretty simple, just put a comparator and inverter at the end and connect that output to the Gate input), whatever you want.

Just bear in mind that this ASR is fairly well tuned, so modifying it may result in you needing to make a few other changes. But, hey, isn't that why we are in the DIY synth gig anyway?

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