This circuit was found in a 1970's Radio Electronics. The pulse transformer has a 1: 1 turn ratio. The triac must be in accordance with the controlled load.
This charger can be used with one to four AA, AAA, C or D cells. The maximum current is given by R...
This wired intercom was found in a 1960 Sylvania transistor manual. The transformers are the type...
In the figure we have the way to control a triac of the TIC series with a low voltage through a...