Shift register driver

  
A16 V power supply can be synthesized as shown using IN1692 rectifiers. A shift pulse input saturates the 2N2714 depriving the Darlington combination (2N2714 and 2N2868) of base drive
Shift register driver - schematic

The negative pulse so generated on the 15 V line is differentiated to produce a positive trigger pulse at its trailing edge.




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