This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The two-transistor circuit used an electret microphone and had a range of a few dozen meters.
The purpose of this circuit is to 'produce a beam of infrared rays modulated at a frequency that...
The circuit shown is intended for cable testing, providing status indication via LEDs. The number of...
This '90s circuit found in National Semiconductor documentation uses components from the time. |...