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  • 5 weeks later...

Need change motor ( with speed control circuit ) , reducer, speed sensor and install other system software.
Original circuit has rotary switch with four positions and potentiometer. 
First position - standard development time ( film in CD - 3 min 15 sec.) .
Second position - film in CD 3 min 45 sec.
Third position - film in CD 4 min 15 sec.
Fourth position - time is adjustable using external potentiometer ( time in CD from  minimum to maximum ) .
Can be used rotary switch with more positions and can change standard times ( using internal potentiometers ) .

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