[sdiy] ADSR circuit trouble

[Dan Snazelle]

THanks

what i am seeing on the ADSR out is a constant 7 or 7.5 volts.

i cant get it to stop and the pots dont make a difference. when fed into a vca, it just keeps it OPEN.



so...i dont know what problem this points to but....

also..it doesnt seem to matter if i have something plugged into the GATE IN or not. the voltage on the output goes to 7 volts as soon as i turn the power on.


if you know any of the voltages off hand..let me know.

appreciate it!


--------------------------------------------
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Date: Fri, 21 Nov 2008 09:56:16 -0500
From: beansharicots at gmail.com
To: subjectivity at hotmail.com
Subject: Re: [sdiy] ADSR circuit trouble
CC: synth-diy at dropmix.xs4all.nl

I built one of these a month or so ago (Metalbox version).  What voltage are you seeing on the output?

-=john

2008/11/21 Dan Snazelle 



Sorry for all the questions guys. i will try to ask fewer after this one. this is the last NON working thing in my project.



Here is a case of something that worked fine a week ago, and then when i wired it permanently, it stopped working.



the circuit is here:



http://www.elby-designs.com/asm-2/adsr/adsr1-asm2-cct.pdf



and docs

http://www.elby-designs.com/asm-2/adsr/adsr-asm2-about.htm

(i built ADSR1)





Oddly, The LED is lighting up constantly (not turning on and off)

There is nothing on the ADSR output.

The schematic is a loop so i am having a hard time figuring out where to check

i have re soldered all the joints and changed all the chips (except the 4053 which i dont have another one ;(



all the chips seems to be getting the correct voltage.



basically i am stuck



i have spent 2 days trying to look for solder bridges or incorrectly wired pots.



i have hit a wall where my experience stops as i have only built one other ADSR (ray wilsons)



there is nothing on pin 15 of the 4053 but all the other outputs of the 4053 are working properly.





i am trying to figure out what might be a likely problem.



obviously if the LED is always on, something is wrong

ANY Advice would be great



i have been testing it by sending a gate out (from a sample and hold) into the gate in.

i am then taking the ADSR out and putting that into an external VCA (just for testing)



i have started writing down all the voltages on each pot and pin if that will help anyone.



thanks











--------------------------------------------

check out various dan music at:



http://www.myspace.com/lossnyc





http://www.soundclick.com/lossnyc.htm





http://www.indie911.com/dan-snazelle

(or for techno) http://www.myspace.com/snazelle







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