Hi all,
I got a very basic doorbell. It has a cheap chip directly driving a 2 inch speaker. The input has a PNP switch. Problem is it triggers itself and ringing too. I think because of the 5 meter long switch wire "twisted together with 220V high volts wires". Maybe also the leakage around PNP. There is a 10k pullup resistor exist and a 10uF too, but I guess this is not sufficient. What can I do?
Later I found that to save wire, an electrician used neutral wire of mains as a one wire of the switch. As I know the neutral wire has great amount of shocking voltage compared to earth.
I got a very basic doorbell. It has a cheap chip directly driving a 2 inch speaker. The input has a PNP switch. Problem is it triggers itself and ringing too. I think because of the 5 meter long switch wire "twisted together with 220V high volts wires". Maybe also the leakage around PNP. There is a 10k pullup resistor exist and a 10uF too, but I guess this is not sufficient. What can I do?
Later I found that to save wire, an electrician used neutral wire of mains as a one wire of the switch. As I know the neutral wire has great amount of shocking voltage compared to earth.
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