Two-tone doorbell circuit

  
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Use the 48V (60V) DC feedback electric current which is provided by the phone feedback line as the working energy of the electronic doorbell is very economical and practical. Now I introduce one kind of two-tone doorbell circuit with out battery. The circuit is as shown, circuit in this figure is the variant of conventional telephone ringing circuit. a, b..
Two-tone doorbell circuit - schematic




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