From James Meagher Sent Fri, Oct 11th 2019, 14:12
From James Meagher Sent Fri, Oct 11th 2019, 14:12
Thanks everyone. Bob Grieb also shared the System 100m 140 module schematic w= ith me yesterday, but for some reason he can=E2=80=99t post emails directly t= o/through the AH group.=20 Anyhoo, I=E2=80=99ve been without power since yesterday afternoon (unusually= early snow storm even for the Canadian prairie) so have had some bigger fis= h to fry . . . But Steve probably nailed it by catching that incorrect resis= tor value. Hopefully I have a 560K laying around (or something really close)= .=20 Another lesson learned is that I will definitely orient all my resistors con= sistently in the future for ease of debugging.=20 When I have heat and lights I=E2=80=99ll report back. XD Sent from my iPhone > On Oct 11, 2019, at 8:52 AM, Steve Lenham <xxxxx@xxxxxxxxxx.xx.xx> wrote: >=20 > You have fitted a 560R resistor (green-blue-black-black) where it should b= e a 560K (green-blue-black-orange). That will be preventing the transistor w= hich switches in the sustain pot from coming on, so might well have somethin= g to do with your problem... >=20 > Hope this helps! >=20 > Cheers, >=20 > Steve L. > Benden Sound Technology >=20 >=20 >=20 >=20 >> On 11/10/2019 05:09, W. James Meagher wrote: >> Looked over every component and can't locate a mistake made there (all tr= ansistors are where and what they should be). Even decoded all the resistor c= olor bands to make sure all of those values are correct. >> Build pics: >> Freq Central ENV build front <https://imgur.com/99SqcUh> >> Freq Central ENV build back <https://imgur.com/VI8SytE> >> Freq Central ENV build detail 1 <https://imgur.com/VnqDKJe> >> Freq Central ENV build detail 2 <https://imgur.com/GzBrclV> >> On Thu, Oct 10, 2019 at 11:56 AM James Meagher <x.xxxxx.xxxxxxx@xxxxx.xxx= <mailto:x.xxxxx.xxxxxxx@xxxxx.xxx>> wrote: >> Thanks a lot for the responses. >> I used the BC557 and 547s in the build. I=E2=80=99ll triple check when= I get >> home that they=E2=80=99re all oriented properly. I=E2=80=99ve also mea= sured both of >> the B100K pots and they=E2=80=99re functional. >> I=E2=80=99ll report more, and include detailed build photos when I get= home >> this afternoon. >> Cheers, >> James >> Sent from my iPhone >> On Oct 10, 2019, at 10:51 AM, DJ Maytag <xxxxxxxx@xxxxxxxx.xxx >> <mailto:xxxxxxxx@xxxxxxxx.xxx>> wrote: >>> Looking at the board traces, the transistors are directly >>> connected to the B100K sustain pot. What transistors did you use? >>> The pin out definitely matters, depending on which ones you use. >>> The board shows 3x BC547=E2=80=99s and 1x BC557. If you use 3904/3906= =E2=80=99s, >>> they will be facing backwards compared to the footprint on the >>> silkscreen. >>>=20 >>> http://www.instagram.com/djmaytag >>> http://www.soundcloud.com/djmaytag >>> https://choon.co/artists/djmaytag/ >>>=20 >>> ---------------------------------------------------------------------= --- >>> *From:* Quincas Moreira <xxxxxxx@xxxxx.xxx <mailto:xxxxxxx@xxxxx.xxx>= > >>> *Sent:* Thursday, October 10, 2019 9:52 AM >>> *To:* DJ Maytag >>> *Cc:* W. James Meagher; AH heaven >>> *Subject:* Re: [AH] Frequency Central ENV build help >>> I've just recently built the Product, which uses the same ADSR >>> circuit and had no issues. I'll see if Rick will share his >>> schematics with me and come back with some ideas >>> https://youtu.be/QyaoopkA1PU >>>=20 >>> On Thu, Oct 10, 2019 at 9:31 AM DJ Maytag <xxxxxxxx@xxxxxxxx.xxx >>> <mailto:xxxxxxxx@xxxxxxxx.xxx>> wrote: >>>=20 >>> I=E2=80=99ve built a bunch of these, and they=E2=80=99re dope AF e= nvelopes. >>> The =E2=80=9Cduff 351=E2=80=99s=E2=80=9D were going around 3-4 ye= ars ago, so aren=E2=80=99t >>> much of an issue now. >>>=20 >>> It=E2=80=99s a clone of the System-100m envelope, so that=E2=80=99= s where >>> you=E2=80=99re going to find the best schematic. Can you post a l= ink >>> to a pic of the build? >>>=20 >>> http://www.instagram.com/djmaytag >>> http://www.soundcloud.com/djmaytag >>> https://choon.co/artists/djmaytag/ >>>=20 >>> -----------------------------------------------------------------= ------- >>> *From:* W. James Meagher <x.xxxxx.xxxxxxx@xxxxx.xxx >>> <mailto:x.xxxxx.xxxxxxx@xxxxx.xxx>> >>> *Sent:* Wednesday, October 9, 2019 1:44 PM >>> *To:* AH heaven >>> *Subject:* [AH] Frequency Central ENV build help >>> I recently purchased a bunch of Frequency Central boards (DUAL >>> XVCA, State 700 VCF and two System X ENVs). The XVCA and State >>> 700 VCF builds went fine and work perfectly. >>>=20 >>> Unfortunately both of the System X Envelopes have a Sustain >>> value of 100% no matter where the sus pot is positioned. The >>> attack and release work as they should, and the decay can't be >>> judged as functioning or not with the sustain always at 100%. >>>=20 >>> I received Ver. 2B panels for the envelopes and proceeded with >>> the build document Version 2 / March 2013. >>> (http://www.frequencycentral.co.uk/wp-content/uploads/2013/06/Sys= tem-X-Envelope-Ver2-Build-Doc.pdf) >>>=20 >>> The only area where I strayed from the parts as labelled on >>> the PBC was replacing the LF351's with TL071's as Rick >>> mentioned that "duff" LF351's were making the rounds. I also >>> did this on the State 700 VCF build and that went fine. >>>=20 >>> I've messaged Rick about the issue, and requested a schematic >>> or suggestions to help track down the problem, but without >>> response. >>>=20 >>> As this is my first ENV build I'm not familiar enough with the >>> circuit to pursue the issue without at least a schematic (or >>> helpful hints where to look). If anyone here has any ideas I'm >>> all ears and appreciative. >>>=20 >>> Cheers, >>> James >>>=20 >>>=20 >>>=20 >>> -- QMA =20 >>> Quincas Moreira >>> Director | QMA >>> mobile: 5534988825 <tel:5534988825> >>> site: quincasmoreira.com <http://quincasmoreira.com/> >>> email: xxxxxxx@xxxxx.xxx <mailto:xxxxxxx@xxxxx.xxx> >>>=20 >>>=20 >=20