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.
An interesting basic circuit for projects is shown in the figure. It consists of a digital...
This circuit provides a signal when dialing occurs. The circuit is powered by the telephone line...
This circuit, for a bulb of 6 V up to 200 mA, was found in an old Argentine publication of the...