Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms. The circuit can be built with modern equivalent transistors.
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. |...