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STABLE_FOUR_TRANSISTOR_TIMER

2016-05-07 14:33  
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STABLE_FOUR_TRANSISTOR_TIMER
Circuit has good immunity to impulse noise because normal state of all transistors is on. This eliminates spurious timing cycles that sometimes occur in IC timers. At switch-on, C begins charging until its voltage makes Tr2 start conducting; this in turn makes other three transistors switch on. Regeneration action then discharges C to about 0.6 V. Timer is started either by applying VCC or opening S1. Timing period depends on value of VCC.-J. L. Linsley Hood, One-Shot Timer Circuit, Wireless World, Nov. 1975, p 520.