This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The transistor must be mounted on a heatsink and the transformer is a 1,5A secondary winding.
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...