Did you get this sorted out? I completely missed this! I have all cables to the connector on the board.
GssL 20th Anniversary edition
- Thread starter Gustav
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Help Support GroupDIY Audio Forum:
Yes I saw that to when I turned the board around today1. Your soldering can be interpreted in two ways.
Either, you started out really descent, and got impatient, or
You started out a little rough, then got better.
There is a clear difference across the board, and a lot of suspect cold soldering joints, but either you need to just be patient, or keep going with what you learned
I would reflow them. Use a little tin on your tip to get it flowing, and make sure you are heating both the pad and the component terminal.
2. The threshold needs adjustment on a resistor for the 10K pot, relative to using a 50K in the standard GssL. I may have forgotten I just did that on the prototype, and didn't correct it in the file. I cant get to the computer I have the file on now, but whats the voltage on pin 2 fully ccw and fully cw?
Gustav
it was I got impatient I believe I will measure pin2 tomorrow and reflow those wacky spots. And looking forward to which resistor that maybe have to change.
Its not a good idea to risk introducing another error variable before we have sorted what is in front of us - at least since this is a non-critical issue for basic operations.
Doing the mod will change your make-up gain from going both positve and negative to going only positive.
Gustav
I hear you Gustav. On a later step this one.
Pin2Yes I saw that to when I turned the board around today
CW : -12
CCW: -06.5
Pin 3
CW: -06.7
CCW: -06.5
Pin:1
CW: -12
CCW: -12
Change R155 to around 3K5 (please read below as well).
You can use anything up to 7K, if you happen to have that around, and if you have something over that (10K, 15K), solder it in parallel with the 33K currently there.
edit:I overlooked your measurements on pin 1 and 3, which have changed again. I suspect there might be a methodical error, rather than an actual error, and we will need to get more precise (patient?), as well as more cognizant of the orientation of the probes for positive/negative measurements if we need to dive deeper.
Before any of that, just try changing the resistor to see if you get in range, and well take a step back if you dont. (it needs changing either way).
Gustav
You can use anything up to 7K, if you happen to have that around, and if you have something over that (10K, 15K), solder it in parallel with the 33K currently there.
edit:I overlooked your measurements on pin 1 and 3, which have changed again. I suspect there might be a methodical error, rather than an actual error, and we will need to get more precise (patient?), as well as more cognizant of the orientation of the probes for positive/negative measurements if we need to dive deeper.
Before any of that, just try changing the resistor to see if you get in range, and well take a step back if you dont. (it needs changing either way).
Gustav
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Can I use 0.25w resistors? I have a bunch of those and in 3.3k
If so I can take one 3.3k in series whit a 200r.
Those from Reich 0.6w I have left 4x 10k and 3x1k and some 4.7k
Edit: anything up to 7k, ok then the 4.7k will work
Edit: Whit 4.7k Resistor in place measuring.
PIN2: CW:-12 CCW:+0.34
PIN3: CW: +0.38 CCW:+0.37
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With a 3K5 resistor to a 10K pot, I get -12 to +5VDC range on controlvoltage.
That puts me at around 12 o'clock for compression to nibble at 0dBU - fastest attack and fastest release on 2:1
...and at around 20dBU reference for it to nibble when dial is set fully clockwise, which corresponds to what we marked on the front.
Big question is, did changing R155 enable you to dig in more?
Try 3K3 next and see, if you go over my voltages on pin 2
Gustav
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Changed to 3k3 (0.25w)
PIN2: CW:-11.9 CCW:+5.4
PIN3: CW: 5.4 CCW:+5.4
Ratio 2:1
Attack: .1
Release: Fast
Full ccw compress about 1.5-2db
I have to go way more than 12 a clock. nothing happens until like 8 a clock
Not musch different between 2:1/4:1
Have to go to 6:1 for it to reach-4db on vu meter and full ccw
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I really have to push my preamp in to the compressor to be able to compress 12 a clock.
Out from Ableton to sound card (preamp) is -10db
I this a calibration thing?
Like I said from beginning this is new to me.
But its seems everything else working now Gustav every pot is acting as it should. at least the same as my soft compressors
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I really have to push my preamp in to the compressor to be able to compress 12 a clock.
Out from Ableton to sound card (preamp) is -10db
I this a calibration thing?
Like I said from beginning this is new to me.
But its seems everything else working now Gustav every pot is acting as it should. at least the same as my soft compressors
Theres no calibration beyond a dB in the signal path, so no - Its probably a matter of how your hardware and DAW is set up, and I'd rather not get into that
All things being equal, its really hard to make sense of if you cant give a dBU reference for what the unit is actually seeing on its input.
Gustav
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Yes you are probably right.Theres no calibration beyond a dB in the signal path, so no - Its probably a matter of how your hardware and DAW is set up, and I'd rather not get into that
Gustav
The compressor sounds so good Gustav!
And thank you so so much for your troubleshooting help.
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Ok i think it’s something about the trim for vu meter. I follow diy.re guide how to calibrate it but I can’t trim it nothing happens when turning the trimpot and this explains why I compress on vu atleast so little? See attached pics.Theres no calibration beyond a dB in the signal path, so no - Its probably a matter of how your hardware and DAW is set up, and I'd rather not get into that
All things being equal, its really hard to make sense of if you cant give a dBU reference for what the unit is actually seeing on its input.
Gustav
What I did:
Ratio 4:1
Send -10dbfs to compressor,
Make sure REW (the program) received back -10dbfs (unity gain)
turn Threshold until level IN on REW showed -18dbfs
And my Vu meter shows like 4db.
Im supposed to turn the screw on the trimpot so vu meter shows -8 but nothing happens
EDIT: When I turn the threshold so the vu meter is showing -8db then I get -28dbfs in REW.
So my vu meter is off a lot
Edit: so after looking up the vu meter you use in your build it has 100ohm internal resistor. My vu meter has 600ohm internal resistor. So I guess I have to change a resistor or the trim pot on the board to get it right?
Edit: I spent last night and this morning to research as much as I can to try understand all this.
According to expat audio vu board he is using a 220K resistor where we now have a 2k2 resistor in place (See pic)
Funny thing is when I connect a 1k I parallel whit the 2k2 the meter shows -8db on the spot!! And the trim pot works..BUT before I solder a 1k in that place I really want some verifications from someone that knows stuff!!
OR is it the 170k above whit a * on it to 1k? (reference DIYRE bus comp)
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I cant really follow you to all the avenues you are going down, and I dont understand your methodology, or even have the slightest idea of your references, but...
Absolutely nothing happening with the trimpot is suspicious, wether the value is in range for your meter or not. I would suspect the trimpot had a bad solderpoint on the viper, or a short, or was just broken if you cant move the reference at all trimming it.
But if this works, you either caught the bad solderpoint, or just came into range for your meter, and all is good.
Gustav
Absolutely nothing happening with the trimpot is suspicious, wether the value is in range for your meter or not. I would suspect the trimpot had a bad solderpoint on the viper, or a short, or was just broken if you cant move the reference at all trimming it.
But if this works, you either caught the bad solderpoint, or just came into range for your meter, and all is good.
Gustav
I really trying my best over here Gustav to wright so you understand what im trying to achieve.
Im new to this and don't know every technical terms etc.
Im trying to learn this stuff the best I can.
The threshold was off we solved that whit changing a wrong named label. all god. JAY
After that my vu meter was off.. I googled calibrate vu meter and diy.re have a good video about that.
but the problem was that my trim pot was not responding to adjustment. AND then I saw the vu meter you guys used have 100ohm internal resistance, but my ssl style meter have 600ohm internal resistance.
So ok make it simple.
Should my ssl style 600ohm internal resistance have some other resistor on the board.
I guess you boom was for the vu meter you uses?
And you put a 2k2 resistor left to the trimpot for a reason. Doesn't feel confident to ok if 1k work there den congratulations you are done.
Whit that 1k resistor in place the trimpot works and threshold start to compress first at 9 o'clock whit a 1khz signal at -10dbfs to compressor
I want it to be right and im am really thankful of your support.
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I was stating a suspicion, that even with the higher internal resistance on your meter, there should still be at least some difference when trimming. You reported no difference earlier. I tried to convey that you may have had a bad solder point that was also cleared, or the trimmer viper had some problem and made contact.
Since the meter is now working as you would expect it to, and you are also able to trim it.
Gustav
Since the meter is now working as you would expect it to, and you are also able to trim it.
Gustav
Checked again and yes there is movement on the needle whit the 2k2 in place but its like baby ants steps.
Reflowed all soldering points to nice and shiny
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