This circuit is from the 80's but uses common components today. The relay is voltage sensitive according to the power supply used. Transistors may be general purpose types.
Analog Devices ADuCRF101 Wireless Data Acquisition System Now at Mouser February 24, 2015 - Mouser...
This circuit acts as a NOR gate for LED drive from TTL outputs. The circuit must be powered from a 5...
This circuit allows the use of a common cassette to pass the tape recordings to other media with...