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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

MUSES 72320 electronic volume
MUSES 72320 electronic volume
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Old 15th March 2019, 12:51 PM   #421
mt490 is offline mt490
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Join Date: Jun 2010
Almost there with my project.

MUSES72320 volume control of course flanked with quad stereo inputs switched by ADG1439's, stereo peak level meters and RMS responding linear-in-log loudness meters with about 110dB response range.

Not shown is the micro doing the brainwork and the level display, still some work to go, it will eventually be integrated with the amplifier for power control and power metering. Also it can do stuff like live normalisation and limiting, but for most of my use that will be a play tool than anything useful.

Feature wise mostly overkill, just made to push the boundaries of technique. The business end of the level meter is made involving SOT-563 dual transistors which were a learning experience to handle without paste.

I will probably build a second one to use as a general purpose measurement interface.

Click the image to open in full size.


Q: Has anyone tried to omit the cap shown at the opamp inputs for bipolar operation?

I have the OPA1642 ready to go in now that all functional parts are tested though, so maybe not so important. Currently there's the bipolar opamp there but I'm wondering if the DC blocker at that position is really just the fruit of a perfecting engineer, or if it's genuinely a detail that will degrade performance.
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Old 15th March 2019, 03:28 PM   #422
CeeVee is offline CeeVee  Portugal
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Join Date: Dec 2006
MUSES 72320 electronic volume
Just in case anyone is interested there is a arduino libary for the MUSE chip now at : GitHub - qhris/Muses72320: Muses72320 library for Arduino
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