This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and does not need a transformer. The bandwidth goes from 100 to 20 000 Hz.
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...
This protection circuit was found in a 1987 documentation. It consists of a relay that is...