Pro Audio Design Forum

I'm going to have a few final stares at the layout and submit it this morning. One thing I did catch looking at the schematic is that I really need to lower the reference voltages to +/- 10V. The -Vref is buffered by an op amp and -12V is too close to the input common mode limit and output voltage s...

Getting closer. All the routing is done. Now I need to redesignate the components and conform the schematic.



A full 3/4 of the components and board area are voltage references, buffers and metering.
I added a +12V reference shunt regulator.

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emrr wrote: ↑Wed Aug 02, 2023 9:09 pm Coming together….

Pleased to report that I'm about 80% done on the layout.

To attempt upward expansion I added a diode clamping circuit which produces, in the detector output, a linear response then log at one diode drop. When combined with the expo response of the VCA the overall response is exponential then linear. Having this stage prevents huge amounts of upward expans...

Looking amazing Wayne! Comparing this to your previous schematics it seems like it wouldn't be a terribly difficult mod to add expansion back in by allowing the detector to drive either the + or - side of IC12B (and IC13B), correct? I understand it doesn't really make sense on a mastering clipper, ...

I updated the schematic to include the threshold winky LED and Gain Reduction meter outputs. https://ka-electronics.com/images/png/Waveulator_ME_Mastering_Edition_081723-1.png Waveulator ME Mastering Edition Schematic 081723 IC20 lights an LED when the threshold is exceeded by about 1/2 dB. IC18 is ...

I wished I had a good cure for silver sulfide on switches. With stinky "junk" silver coin I use baking soda in warm water in a glass pan with a sheet of aluminum foil. It pulls the funk right off. I would never do that with collectable coins but for junk silver dimes, quarters and half dol...

So I finally got some time in the house alone and can work. For the last week or so it's been tough. You normally think of cabin fever being something that happens in the wintertime but, here in Texas, with normal daily highs being around 100° you can get cabin fever in the summer and winter. I had ...

Glad you found it. Too bad contact cleaner didn't resolve it.
Are the contacts silver?