Electronic circuitry for camera shutter control - uses flip=flop and time constant charging to control shutter operation

摘要

Electronic circuitry is for shutter control in a camera requiring long exposure time or exposure at fixed time intervals. The circuit is powered by a battery (21) and switched on (20) manually. It uses two transistors (1, 2) in a flip-flop arrangement with control resistors (3-8) to determine operating time constants. The shutter is controlled by an electromagnet (19) operated by threshold switching circuitry (18) which is, in turn, controlled by the build up of charge on a capacitor (17) and the operation of the flip-flop.