This circuit is from a 1968 documentation. It makes use of thermistors (NTC) to indicate overheating of charged batteries. Modern equivalent components can be used.
Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of...
Found in a 1969 documentation on neon lamps, it actually takes advantage of the durability of the neon...
This circuit interferes with the operation of infrared remote controls. Your radiation should be...