This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The relays are sensitive types with currents up to 200 mA.
This oscillator for receiving SSB signals is intended for receivers with IF of 455 kHz. The...
This thermostat was found in a 1997 publication. It can be powered by 6 V with the use of a...
In the figure we have the basic configuration for interfacing TTL logic with CMOS logic. The...