Saturday, March 30, 2019

Simple doorbell circuit using 555 timer + schematic diagram included

A very simple doorbell circuit driven by 555 timer chip. This kit you can find it cheap on eBay less than $1 - but if you are the type who can't wait like me and having the components available why not just build one. So the components are not exactly the same but it works almost exactly the same.

1 x 555 timer IC
1 x momentary switch
4 x 47k resistors
2 x 4148 diode
1 x 10 uf electrolytic capacitor
3 x 103 ceramic capacitor
1 x 8 Ohm speaker
100 uf Capacitor


  1. Thanks, very nice.
    I am a little confused with the 3x47K electrolytic capacitors.

    1. Thanks for spotting the mistakes it should be 4 x 47k resistors