Constant current source (CB20484E)

This circuit uses a current regulator from the 90's. This component is uncommon nowadays. The transistor admits equivalent.

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...