This circuit was obtained from an English magazine from 1979, but can be easily assembled nowadays, as all components are common. Q1 can be a TIP31 or other power transistor according to the motorcycle horn current. L The base resistor will be 220 ohms at 1 k depending on the gain of this transistor. The sensor is a diode that when removed or turned off, triggers the alarm.
| Clique na imagem para ampliar |
