Vinyl LPs are making a comeback. While reading some of the recent stories about the return of phonograph records, I was reminded that one of the last products that I designed at Harrison Systems was a phono preamplifier targeted at the broadcast station market.
Here’s the schematic diagram for an updated version. The original used 5534A op amps. This one uses the newer OP275. Click on the diagram to embiggen it.If enough people are interested, I’ll layout a pc board and make it available for sale.