- I think the +12V you meant, it is from the battery +ve directly. Is it?
- I think the 'Earthing' you meant, it is from the battery -ve directly. Is it?
- 'Blinker power' means? (From/to the connection leads to?)
- 'Blinker input' means? (From/to the connection leads to?)
- 'Earthing' (in the red middle circle) means? (From/to the connection leads to?)
- How the circuit from the '11' from IC? (Using the transistor)
The circuit is based on assumptions about how a motorbike is wired. When you activate either a turn signal or the safety flashers, that applies 12 V to the flasher or blinker device. This is where you connect the power input to the circuit (blinker power). All ground symbols connect the the battery - terminal.
The output of the bike's flasher device is what turns your lights on and off, and is connected to the circuit "blinker input". This is how the circuit can count the number of flashes and active the buzzer on the 10th one.
U1 is a decimal counter that has 10 outputs. As it counts, each input is activated in sequence. Pin 11 is the output that goes high on the tenth count. This turns on the transistor and activates the beeper.
ak