Reverse polarity protection 2 (CB22140E)

This circuit has an improvement over the previous one as it also has an LED indicator for correct polarity.

Circuit for Inductors Test (MSB071E)
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...
Dimmer with Triac (CB12244E)
This dimmer was found in a 1980 publication. The Triac can be any of the TIC series and the...
Conventional Astable (CB24839E)
This common circuit is from September 1984 Radio Electronics. The transistors are general purpose, and...