Bel is automatic with electronic buzzer that made by most of the people or the bell house loudspeaker then click once inside the ring. How it works is similar to automatic bell as weker. Button is pressed now, then an hour a new ring. Thus, the automatic bell this tool can be used as a reminder time.
Kopmponen needed:
- Transistor (TR) 1 = BC109 or similar
- Transistor (TR) 2 = BC109 or similar
- Resistor (R) 1 = 2Mohm
- Resistor (R) 2 = 1Mohm
- Resistor (R) 3 = 1Mohm
- Resistor (R) 4 = 4K7ohm
- Resistor (R) 5 = 10Kohm
- Resistor (R) 6 = 150Kohm
- Resistor (R) 7 = 100ohm
- Condensator (C) 1 = 470uF
- Condensator (C) 2 = 470uF
- Condensator (C) 3 = 100uF
- Condensator (C) 4 = 1uF
- Loudspeaker (LS) = 8ohm
- Bateray = 3volt
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