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 oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
This countdown electromagnetic ring launcher was found in an Electronic Hobbyst Handbook from...
This circuit was found in an old Electronic Design used to apply digital signals to an analog...