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.
We found this circuit at Popular Electronics. The components are still current. Changes can be...
We found this circuit in an American publication from the 1990s. The triac must be equipped with a heat...
Found in a Popular Electronics from the 1990s, this circuit uses components from National...