Slide Projector Auto Advance

  
A 4001 CMOS Quad NORgate is set up as an astable multivibrator, which drives a simple differentiator and relay
Slide Projector Auto Advance - schematic

driver. Depending on the setting of S2, a delay of 5 to 30 seconds is generated. S2 and Rl through R6 can be replaced by a single 10-Mohm pot, if desired.




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