GSSL HELP THREAD!!!
- Thread starter hairyandy
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Help Support GroupDIY Audio Forum:
dissonantdissident
Well-known member
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- Sep 7, 2014
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Despite having the resistors placed correctly, using the color bands and double checking with DMM(during build), I'm getting a bunch that seem to have lowered in value. I've never had this happen, before, and I'm pretty stumped. After taking the DMM to the board, there are a bunch of resistors(primarily in the sidechain and VCA sections) that are nowhere near their color code values. For instance, two of the three 1k resistors(the ones on either end of the THAT chips) are reading at 756r.
I've built a number of kits and stuff, and never had the values of resistor altered by me overheating them, during soldering, so I have a hard time believing that I just blew a bunch of resistors. Also, to test my theory, I swapped those 4 resistors with new 1k resistors, but they are also now reading 756r, after only being powered up for a few minutes. None of the resistors look scorched or burned, but many have dropped to less than half their printed value(1meg to 195k
). I'm pretty perplexed, as the test points have always shown the proper voltages, so it doesn't seem that they should have overheated.
Any ideas what could cause this?
Thanks, folks. I'm really itching to get the Cavendish boards, too, but I need to get the main unit running good, before I get to hotrod.
I've built a number of kits and stuff, and never had the values of resistor altered by me overheating them, during soldering, so I have a hard time believing that I just blew a bunch of resistors. Also, to test my theory, I swapped those 4 resistors with new 1k resistors, but they are also now reading 756r, after only being powered up for a few minutes. None of the resistors look scorched or burned, but many have dropped to less than half their printed value(1meg to 195k
). I'm pretty perplexed, as the test points have always shown the proper voltages, so it doesn't seem that they should have overheated.Any ideas what could cause this?
Thanks, folks. I'm really itching to get the Cavendish boards, too, but I need to get the main unit running good, before I get to hotrod.
Dead battery in your Ohmmeter? Or you have to get more precise resistors. +/-30% not good enou
gh to build studio gear))))
Few days ago i measure +/- 22v on my gssl +/-15v supply rails and +/-17v on 12v rails. New battery in voltmeter makes voltages as they should be.
gh to build studio gear))))
Few days ago i measure +/- 22v on my gssl +/-15v supply rails and +/-17v on 12v rails. New battery in voltmeter makes voltages as they should be.
bernbrue
Well-known member
It's normal that resistors being measured in circuit have completely different values than being measured out of circuit. Solder it out and measure the resistor in question. You'll see that it has its values according to the color code.
Bernd
Bernd
dissonantdissident
Well-known member
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- Sep 7, 2014
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Well then, guess that's not what is causing the distortion. I thought that maybe the resistors being off would be causing the problem(unit distorts when the VCAs start reducing gain). Sorry for the newbie posts, but I've never had a build go so wrong that I couldn't fairly quickly identify the problem(like this), and it's been a really frustrating troubleshooting.
Buying new 5534s, today. Never had them in backwards, but I'm running out of non-silicon things to be wrong.
Buying new 5534s, today. Never had them in backwards, but I'm running out of non-silicon things to be wrong.
bernbrue
Well-known member
Holger wanted to say that your vca needs some modification. You have to change some resistors around your dbx vca. It also needs the trimpot for calibrating distortion. You cant just replace the 2180 with the dbx vca without doing any modification. You will find users who built the gssl with your vcas. I never used these vca. So I cant help.
Bernd
Bernd
dissonantdissident
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- Sep 7, 2014
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Well, I'm using the THAT chips that were supplied with Gustav's kit, so I don't think that should be the problem. Sorry if I confused anybody, but this build hasn't had any alterations. Swapped all the opamps, with no change in the distortion issue. At least I know it wasn't that I messed up with the opamps.
Harpo
Well-known member
Funny way of asking for a 30° indexing switch ...G-Sun said:
If for one (single, mono, no turbo) sidechainfilter, something like this BBM (not MBB) lorlin type for a fraction of the elma cost and for the knob a more common avail. 6mm shaft diameter should do. YMMV.
Harpo
Well-known member
3 bit gray code switch with 45° indexing ?G-Sun said:
jasonallenh
Well-known member
I've been having a hard time finding a proper rectifier for this build on Mouser. This is the closest I could match the specs to-
http://www.mouser.com/Search/ProductDetail.aspx?R=W04Mvirtualkey66430000virtualkey905-W04M
Will this work ok in this build? If not, can I just grab four diodes and call it a day?
http://www.mouser.com/Search/ProductDetail.aspx?R=W04Mvirtualkey66430000virtualkey905-W04M
Will this work ok in this build? If not, can I just grab four diodes and call it a day?
The 200r realy for the super sidechain:
Is it something like this:
http://no.farnell.com/multicomp/hrm2-s-dc12v/relay-pcb-spco-12vdc/dp/9480080
?
2 x 1k2 meter illumination: What's this?
(I bought the gssl kit from gustav with bland sc pcb and vu/dc-meter. Is this included in the kit?)
and
2k2 in led: I don't understand 2k2 for leds
Is it something like this:
http://no.farnell.com/multicomp/hrm2-s-dc12v/relay-pcb-spco-12vdc/dp/9480080
?
2 x 1k2 meter illumination: What's this?
(I bought the gssl kit from gustav with bland sc pcb and vu/dc-meter. Is this included in the kit?)
and
2k2 in led: I don't understand 2k2 for leds
jasonallenh
Well-known member
I'm still wondering if this rectifier is suitable for this project-
http://www.mouser.com/Search/ProductDetail.aspx?R=W04Mvirtualkey66430000virtualkey905-W04M
http://www.mouser.com/Search/ProductDetail.aspx?R=W04Mvirtualkey66430000virtualkey905-W04M
Harpo
Well-known member
Sealed (IP67) for rainy days or under water mixing sessions. (for usual the standard type ck1049 would do as well for some ct/€/nk less)G-Sun said:Took a little time for me to understand what to get.
Ended up with this one:
http://no.farnell.com/lorlin/cks1049/switch-1-pole-12-pos-ip67/dp/1701498
Hope it's right
No for the relay, and these 'super sidechain' related questions are all answered numerous times in the "GSSL SuperSC board" thread and some other SCF related threads. No idea what Gustavs kits might have included.
Harpo
Well-known member
For usual -Yes-jasonallenh said:
lol. ok, the problem was finding spindel ø6mm. The others seemed like ø10, but I'm not too sure.Harpo said:Sealed (IP67) for rainy days or under water mixing sessions. (for usual the standard type ck1049 would do as well for some ct/€/nk less)G-Sun said:Ended up with this one:
http://no.farnell.com/lorlin/cks1049/switch-1-pole-12-pos-ip67/dp/1701498
Hope it's right
