Two-tone doorbell circuit


Posted on Feb 5, 2014

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
Click here to download the full size of the above Circuit.




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