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 a 1967 publication. The Triac can be any of the TIC series. The series...
This circuit was obtained in old documentation, but it is valid for modern triacs that must be...
This circuit charges a battery to power a flashlight at night. The circuit is from an English...