[sdiy] ADSR circuit trouble

[Dan Snazelle]

ok

thanks a ton

i will begin testing after i pick up my son at the bus-stop ;)




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




> Date: Fri, 21 Nov 2008 19:49:37 +0100
> Subject: RE: [sdiy] ADSR circuit trouble
> From: simon.oo.o at xs4all.nl
> To: synth-diy at dropmix.xs4all.nl
> 
> If the gate led is lit up all the time, then is the voltage on pin 11 of
> U103 about 13.5V? If not, there could be a short between pin 13 and 14.
> Also check if the power to U103 is OK. The digital and the analog ground
> should be connected together, e.g. using link LK1 in the power supply
> section.
> If the voltage on that pin is 13.5V, check the voltage pin 2 U402. It
> should be about 2V. If not, check R403. If yes, check the voltage on pin
> 3. It should be close to 0V. If not, check R401. If it is the same voltage
> as pin 2, also check if there is a short between pin 2 and pin 3.
> 
> Hope this helps,
> 
> Dan Snazelle schreef:
>>
>> ok
>> scratch that
>>
>> sometimes it shows zero
>>
>> other times it shows 7.
>>
>> when i was testing with my voltmeter and i touched pin 5 of the tl082
>> (output opamp) the voltage suddenly dropped to zero. it then only came
>> back when i touched underneath the board
>>
>> very strange
>>
>> but no matter what, that LED is lit up
>>
>>
>> this is very confusing!
>>
>>
>> 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
>>
>>
>>
>>
>> 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
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>> Synth-diy mailing list
>>
>> Synth-diy at dropmix.xs4all.nl
>>
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>
> 
> 
> -- 
> Vriendelijke groet,
> 
> Simon Brouwer
> -*- nl.openoffice.org -*- http://www.opentaal.org -*-
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy