Short Wave Converter (T987E)

The conversion range of this circuit depends on the coil. The circuit uses two tubes, and the power supply is not provided.

Power Cut-off Protector (CB17463E)
This circuit, from 1999 documentation, prevents the powered device from receiving power when it...
Timed Voice Photo Relay (CB17041E)
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
Bilateral current source (CB7544E)
Found in a Popular Electronics from the 90's, this circuit uses integrated from that time, today...