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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: December 02, 2022, 06:23:51 PM »

Replaced the 2N7000 (I had some available), still behaving the same way.  Where the meter hovers is dependent on the release time as well.  Another interesting development - the release potentiometer housing now spins freely on the soldered pins and the detents are now essentially useless and the potentiometer is likely not functioning correctly.  Pretty inexplicably too.  I didn't do anything to prompt that behavior.  

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: November 21, 2022, 04:18:12 PM »

Should I just remove it and plug the compressor back in to check?

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: November 09, 2022, 11:32:00 PM »

TP5 @ .367vdc
TP11 @ .006vdc

I just confirmed also that R5-R9 are correctly placed as well.

Thank you!

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: November 03, 2022, 02:29:01 AM »

Well my diodes are correctly oriented and the unit behaves in the same way whether there is one or two channels installed...

Glad to hear you got yours working though, Chris!

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: October 27, 2022, 07:45:22 PM »

I'll have to check.  Just pull the second channel, keep JP1 in place, and do the same test?

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: October 26, 2022, 05:45:54 PM »

Is it time for an isopropyl bath - and if so:

• Would that be for all three PCBs?
• Do I need to remove ICs prior to submerging?
• What strength isopropyl is recommended?

Thank you!

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: October 26, 2022, 04:48:31 PM »

just checked D1 & D2 and they are oriented correctly.

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CP4500 Stereo Bus Compressor / Re: Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: October 25, 2022, 03:28:28 PM »

The meter does move in 2:1.  Its like the meter sees 4dB as the new "zero" when in 2:1 mode.  The meter will respond to input signal though.  I will check the diode position again.

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CP4500 Stereo Bus Compressor / Meter works as expected except on 2:1 ratio, where it stays on 4dB GR minimum

« on: October 25, 2022, 02:50:19 AM »

So the whole setup process went really well until I was passing audio through the unit and checking the sound (and liking it a lot) with some drum loops.  At this point I switched off of the 10:1 ratio down to 2:1.  At 2:1 and 2:1 only the dB Compression meter jumps up to 4dB of compression and stays there as a new baseline.  What is the likely culprit here?  Everything else works as expected, sounds completely clean, and functions normally.  Only the meter in 2:1 mode doesn't work as expected.