Relay driver (CB20549E)

Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at 100 mA of coil current.

Slot Machine (CB16334E)
For those who like electronic games, have good experience in the design of printed circuit boards...
Locked photo switch 7400 (CB22423E)
This latched circuit uses an LDR as a sensor. It must be powered by a voltage of 5 V....
Hartley for 1 MHz (CB25588E)
This oscillator was found in the July 1993 Electronics Now magazine. The coil is wound with...