1-Ttube reflex receiver (T1555E)

This one-tube circuit is equivalent to the previous one. We find it in a 1924 book by Gernsback, Power is made by batteries.

Two Channel Flasher 555 (CB18198E)
This circuit, found in a 1985 documentation, causes two incandescent lamps to flash alternately. The...
Short Circuit Proof Lamp Driver (CB6850E)
This circuit from the 90s, found in an Electronic Engineering can be used as a shield since its...
Light exposure meter (CB8345E)
jkjjjjj Used to measure night light for the purpose of adjusting camera exposure time, this...