This simple logic test circuit with 3 LEDs was found in October 1985 Radio Electronics magazine. The power supply is according to the logic, and this version is indicated for TTL.
The transmitter shown can reach around 100 meters depending on the location and sensitivity of the...
This circuit was obtained from a 1978 Practical Wireless. It generates a low frequency, low...
Using the LM170 integrated circuit, this circuit was found in the May 1970 Radio Electronics...