The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This circuit was obtained from an English magazine from 1979, but can be easily assembled...
The purpose of this circuit is to power a small fluorescent lamp from from a 12 V battery. The circuit...
The circuit shown fires an auxiliary flash from a flash commanded directly by the camera. The sensor...