Relay pull-in timer circuit in time process

  
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the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire 1200turns.
Relay pull-in timer circuit in time process - schematic




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