This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response of 150 Hz to 40 kHz. The power supply must be symmetrical.
This circuit is from 1995 documentation. The power depends on the transformer, which in this case...
We found this circuit in an English publication in 1991. The circuit can be assembled with...
Found in a Popular Electronics from the 90s, this circuit is suitable for communication between rider...