30W Amplifier (T1544E)

This hi-fi amplifier is from a 1975 RCA tube manual. The critical components are the transformers. Power supply is included.

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...