Roman numeral display (CB22160E)

This circuit shows numbers I II and III when mounted on its side, depending on the position of the selector switch.

Power Supply for HeNe LASER (CB21005E)
This circuit is a high voltage source for a gas LASER. We found it in a documentation from the...
LM380 intercom (CB14170E)
This intercom with wires up to 30 meters separation between the stations is from the Linear...
12.6 V x 3 A Power Supply (CB13435E)
This circuit is from an old American publication from 1977. Transistor Q1 can be a TIP42 and Q2 a...