Door bell. Simple electronics

Door bell. Simple electronics. Electronic homemade Sekretmastera. Master shares the secret of making a homemade electronic doorbell from scrap materials. It is based on the chip HT2811. Housing for the doorbell from the ADSL modem. The speaker from the PC 486 series. Compartment supply is taken from the Christmas tree garland. DIY apartment door bell! Make a call with their hands apartment.
Suitable transistors 2N3904 n-p-n 2N3906 p-n-p /
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