This wireless infrared remote sound transmitter is from an article published in the August 1988 issue of Radio Electronics magazine. The circuit can be built using modern, higher-power LEDs.
This circuit was obtained in a 1989 English magazine. Despite using a fixed 5 V regulator, it can...
With the feedback of the output circuit, the monostable acts as a frequency divider, that is, it...
In this circuit of an old American documentation, the input impedance is the same as the output...