envelope/edge detection

[Gurner]

yep, the led does just cut on/off though....upon further testing..

With the arrangement you've used, it'll be a struggle to get a slow release thing going on (that's because as I say, the LED is being driven by an amplified AC signal ....vs. a slow changing DC level based on the incoming AC signal). removing the cap C3 won't help you get a slower release.....but it's not helping your end goal at all so IMHO can be removed. Another downside of that circuit you've used is that input impedance is too low for a raw guitar signal (i.e. about 50k).....you want at least 1M of input impedance, which is why it's better to use a non-inverting opamp arrangement.

[deadastronaut]

yeah i took it out...

http://home-wrecker.com/nurse-quacky.html

so this scheme ^  won't give me that ''release''either  then?...

[Gurner]

http://home-wrecker.com/nurse-quacky.html
so this scheme ^  won't give me that ''release''either  then?...

IMHO no, (I see they've addressed the aforementioned low input impedance problem by prefacing the envelope circuit with a buffer - though their buffer still only has a 470k input impedance which I think is still a tad low)

[deadastronaut]

@#$%ing envelopes..arghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.........................

[deadastronaut]

aha...ive got the fade better by putting a 100uf in parallel with 2 leds....its less snappy....

led.........
            >>>>>led........
cap........


now to suss out how to adjust the bugger....

https://dl.dropbox.com/u/7464107/test1.mp3


as you can hear though, it responds to lower notes, but not the high notes....needs more ass kicking...

[deadastronaut]

this is what i have now...note the switch for fade/staccato.




https://dl.dropbox.com/u/7464107/synthyguitar1.mp3

as you can hear its not sensitive when it comes to hammering/tapping though......hmmmmmmm....