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 conventional power supply circuit with the LM317 was found in a 1987 publication and its...
This circuit is from a 1972 German magazine Funkshau. The circuit can use BC548 transistors...
Found in a 1968 Motorola documentation, this circuit operates at 1 kHz and can deliver 20 V from...