Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to 15 V. The operational amplifier is from the era and can be replaced by modern equivalents.
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...