http://www.educationaltoysclub.com
This circuit uses relay with a buzzer. The intermittent current beats speaker through electrolytic capacitor C. If you finish this circuit and check it right, turn power on, and then you will hear the sound from speaker. Fix the switch on the gate and this is an easy doorbell. The circuit works at 6V. It requires four 1.5V batteries.
Yeah very cool nice job man keep it up man
sethbower11 1 year ago
This is nice
mmok23hk 2 years ago