Ultra-precise long time delay relay

  
Predictable time delays from as low as 0 milliseconds to over 3 minutes are obtainable without resorting to a large value electrolytic-type timing capacitor
Ultra-precise long time delay relay - schematic

Instead, a stable low leakage paper or mylar capacitor is used and the peak point current of the timing UJT (Ql) is effectively reduced, so that a large value emitter resistor (Rl) may be substituted.




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