This circuit is from Radio Electronics from March 1977. The integrated circuit is from that time and the circuit is intended for an infrared audio link. The modulation is in pulse frequency.
This circuit was taken from a popular 90's Electronics. The LDR is mounted next to the LED to feed...
No information is given on the transformer in this circuit that we found in an American 1967...
This oscillator can be used to produce signals ranging from a few kilohertz to approximately 10...