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.
E) This soft start dimmer was found in a Motorola documentation from 1968. However, it can be...
This circuit is from Popular Electronics of the 90's. It makes use of NO and NC sensors. The relay...
The circuit presented is from the 1993 Linear Technology Applications. The components used were...