Hi all
I just finished my built of the CLX (stereo) but it doesn't seem to work as it should. I get sound through but no compression. The meters are not responding either.
I get +15VDC on the rails and +54V on the second connection where it states +24V. Possibly this has got something to do with the PSU (toroidal 50VA 18-0-18). I tried grounding and ungrouding but this didn't make any difference (@BerndVP: I read your comments too...
).
When I want to set the RMS the trimmer seems not to be responding though when I measure it (power off mode) it seems fine (resistance wise). The response I get on the oscilloscope is a very symmetrical waveform though. Also when I take the output I can read the response from the sinewave (on SMAART). So sound is going trough.
My panpots are somewhat responding (gain and threshold is, ratio doesn't seem to be responding but I'm not sure of this). The LED's (above and below) is only responding on the above side. And as I said no meters whatsoever...
Both PCB's do the same thing and I measure on both the same values...
I built the VCA kind, not the discrete one...
There will be quite a few problems instead of just one and I am aware that this might be over my head. But I've built other beautifull compressors before without any issues like these (LA2A, 1176...). I also found a few errors in the 'manual' like most of you did I suppose but anyway I'll give them once again.
C1 is not mentioned though it should be in there (this forum says so). What about C13? I've put it in anyway (don't know if it does make a difference for now). I also suppose they just were forgotten in the BOM-list.
There is no mention of grounding except for the XLR and even that I find hard to grasp (because of the 'chassis' for me is the case and instead they speak of the XLR itself). I tried without grounding and with grounding everything that says 'G' or 'GND'. I hope I'm not making groundloops... But I tried them one by one and untill now it doesn't make any difference on my measurements which I can do.
A few of the trimmers are not mentioned anymore further on in the manual, if they need to be trimmed and how (or what value it should read)?
The LM317's get quite hot too...
I also found an addendum where it says that Q8 is misprinted on the board and that you have to change C14 (from 22 pF to 150 pF) if you use a THAT chip, but this is from REV2? So maybe in REV3 this is corrected? Does anyone know?
I also don't know where to start looking for the error(s)...
I tried the web but this is the most I found (like any of you I suppose).
I think I have all the info there is to find (manual rev3 and a picture from someone here years ago)
Is there anyone out there who got his working (with this kind of buildtype: stereo AC CLX-VU)?
I'll post some pictures too and hope someone can help me here... I also post the addendum I found (I can't remember where so maybe it is from somewhere around here but hey there you have it...)
