Create a schematic diagram of an electric fence controller using the NE556 dual timer IC.
The circuit must include all components with clear electronic symbols(resistors, capacitors, transistors, diode, relay)
connected by lines as in a real circuit diagram.
Specifications:
1. Power supply:
- Vcc = +12V connected to pin 14 of the NE556.
- Pin 1 of the NE556 to ground.
2. Timer A(active 10 seconds):
- Pin 2(Trigger A) receives a pulse from transistor Q2(contact detector).
- Pin 6(Threshold A) connected to Pin 7(Discharge A).
- R1 = 1 MΩ between Pin 7 and + 12V.
- C1 = 10 µF between Pin 6 and ground.
- Pin 3(Out A) goes through a 4.7 kΩ resistor to the base of Q1(BC547 NPN transistor).
- Pin 3 also connected via a 100 nF capacitor to Pin 13(Trigger B of Timer B).
3. Timer B(rest 10 seconds):
- Pin 9(Discharge B) and Pin 8(Threshold B) connected together.
- R2 = 1 MΩ between Pin 9 and + 12V.
- C2 = 10 µF between Pin 8 and ground.