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In Reply to: RE: Sherwood tuner posted by Audiogabby on September 23, 2015 at 16:56:26
See if you can get on the work queue of either Mike Samra or Don Sachs (dls123). Both of those "inmates" do fine work.
The MPX adapter is a fairly easy DIY project. DIYer extraordinaire S. Bench has provided the "blueprint".
Eli D.
Follow Ups:
Ely,For what it's worth, the LM1800 is what I refer to as a "first generation" multiplex decoder IC. There was a second generation that had better all-around specs - like lower THD and higher separation. I believe the Sanyo LA3361 was one but there were a few others - Hitachi and Rohm come to mind as manufacturers. I also remember that some were "pin for pin" compatible with the 1800. Have no idea what few if any of them may be found found today.
Circuitry was very simple compared to the discreet units and as your diagram shows - only one "simple" adjustment ("free running" 19Khz oscillator) is necessary - as the note indicates.
Charles
Edits: 09/24/15 09/24/15 09/24/15 09/24/15 09/24/15
Eli,
Thanks for the info. I will contact these gentlemen to get their opinions. About the DIY MPX poject, well even though i'm a little handy, I rather have someone with some prior experience work on my electronics. I do not want to ruin it or the rest of my system.
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