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Ding Dong Doorbell (2019)

Made famous in the 1960s Avon TV Ads ("ding dong Avon calling") here is a useful and practical device for the front door at home, your bedroom or Dad's man cave.

There are no computers in this kit, it is a simple analogue circuit using the 555 oscillator integrated circuit, a transistor, and a few resistors and capacitors.

The circuit uses a 555 oscillator to drive the speaker. Pressing the button starts the oscillator and after a preset period the frequency changes, giving the classic ding-dong sound. The variable resistor can be used to adjust the tone, making it as pleasant or annoying as desired.

The complete circuit fits on a small printed circuit board. The speaker is glued in place.