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 12 V power supply can be made with scrap transformers from valve equipment that normally have...
This circuit was found in a Philips documentation from 1966. The circuit provides 1 mW with a...
This Siliconix circuit was found in a 1980s documentation. The coil consists of 18 turns of 22...