Projector for diapositive slides - uses digital analogue transducer with two decade stages connected to semiconductors control electrodes

摘要

The apparatus changes the slides without causing mechanical shocks. According to the position of the magazine, a voltage of a first voltage series is connected to the input of a first comparator device via a semi-conductor of the first decade stage and a voltage of a second voltage series is connected via a semiconductor of the second decade stage. Each stage is higher than the next by a factor of 10. A comparator is connected with a further comparator whose further input can be connected via selecting keys with the first or second decade voltage series, which determines the fixed position of the magazine.