Simple telephone time lock circuit diagram

  
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Simple telephone time lock circuit is shown in the above picture. In the circuit diagram, BG1 and BG2 are electronic switches controlled by IC NE555. When the telephone is on-hook, the DC resistance value of the telephone is over 600K?, the current when the external line runs into the IC is very low, and the electronic time lock does not work. When the..
Simple telephone time lock circuit diagram - schematic




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