here I will property describe the calling Bell circuit, step by step.
component -2N3904 transistor
-UM66T music ic
-16v/220uf polar capacitor
-2200uf/16v polar capacitor
-220 ohm 1/4watt resistor
-C945 transistor
-2.2k ohm 1/4 watt resistor
-3k ohm 1/4 watt resistor
-use any normaly open(NO)Switch
Негізгі бет how to make musical door bell & calling bell
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