This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined by L1. The integrated circuit used is uncommon today.
The circuit shown in the figure consists of a phase shift oscillator and its components have been...
Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to...
The battery charger suggested in the figure has its current limited by resistor R1. This component may...