This circuit was obtained in a documentation from the 80's. However, using TTL it is still modern, being able to be used as Shields for microcontrollers or part of digital projects.
This General Electric circuit was published in 1970. The LED is infrared and the voltage according...
Found in a Popular Electronics from the 90s, this circuit activates a recorder for automatic...
The circuit shown in Figure bellow generates frequencies of 50 Hz, 100 Hz, and 200 Hz. The circuit uses a...