Arrigotti
Well-known member
I built 2 1176's using MNATS boards and a couple of cheap Modutec Mouser VU Meters (part # 541-MSQ-AVU-AW).
Once I got it up and running (with much help from you all) I went to adjust it. I think I was able to figure out the Q bias adjustments....good.
My problem is that I can't get the VU to 0 in GR mode. It gets to about -3db with the trimpot all the way CCW, and interestingly, the GR Tracking trimpot affects it also. Actually, if I totally screw up the Q bias, I can get it there, but I don't think that's the way to go.
I am getting .938 volts at the meter switch PCB (+ and - for VU) and 187mv after the goo-covered rectifier that came with the VU Meter (just before the VU meter). Could this be the problem?
Also, the output setting for the meter is about -15db off. This probably goes hand in hand with the other problem.
I have been checking the actual output through the computer (Sound Forge) from an Apogee Rosetta.
Everything else seems to be functioning as expected. I get compression, attack and release work as expected as do the input and output adjustments.
Once I got it up and running (with much help from you all) I went to adjust it. I think I was able to figure out the Q bias adjustments....good.
My problem is that I can't get the VU to 0 in GR mode. It gets to about -3db with the trimpot all the way CCW, and interestingly, the GR Tracking trimpot affects it also. Actually, if I totally screw up the Q bias, I can get it there, but I don't think that's the way to go.
I am getting .938 volts at the meter switch PCB (+ and - for VU) and 187mv after the goo-covered rectifier that came with the VU Meter (just before the VU meter). Could this be the problem?
Also, the output setting for the meter is about -15db off. This probably goes hand in hand with the other problem.
I have been checking the actual output through the computer (Sound Forge) from an Apogee Rosetta.
Everything else seems to be functioning as expected. I get compression, attack and release work as expected as do the input and output adjustments.