Found in old American documentation, this receiver receives modulated infrared signals and converts them into sound. The audio amplifier circuit can be replaced by a modern equivalent.
This special effect circuit with LEDs using the 4017 was obtained in a 1982 publication. LEDs are...
Found in a 1967 Electronics World, this circuit uses unusual components today. The transformer has a high...
In the figure we have the basic configuration of a rectangular oscillator using an operational amplifier...