Found in a 1965 Electronic Design, this high voltage circuit uses period transistors. Its purpose was to excite Nixie display tubes common at the time.
The circuit shown fires an auxiliary flash from a flash commanded directly by the camera. The sensor...
This circuit, obtained in an old publication, causes a second telephone bell to be played in a...
The project is from a 1992 publication, but totally current by the components it uses. The LEDs...