1. Microcontroller or Control Unit: This will control the timing for the ignition coils. Popular choices for custom ignition systems often include Arduino or other microcontrollers.
2. Ignition Coil Driver: This typically involves a transistor-based circuit to drive the ignition coils, such as an IGBT (Insulated Gate Bipolar Transistor) or a Power MOSFET. It manages the high current and voltage requirements of the ignition coil.
3. Ignition Coils: If using COP, you'll have multiple ignition coils, one for each spark plug you are controlling.
4. Timing Sensors: Sensors like a crankshaft position sensor to detect the position of the engine and synchronize the spark timing.
5. Power Supply: Depending on your ignition coil, you'll need an appropriate power supply, often a 12V or higher DC source.

• Control Unit: Connect the control unit to the transistor gates in your driver circuit.
• Driver Circuit: Use a transistor (IGBT or MOSFET) connected to the control unit. Transistors switch the ground or power connection to the ignition coils. Connect the transistor's collector (or drain) to the ignition coil and the emitter (or source) to ground. Control the base (or gate) with the microcontroller.
• Ignition Coils: Connect one terminal of the coil primary winding to the power supply (VCC) and the other terminal to the collector (or drain) of the transistor.
• Sensors: Connect the sensors to the microcontroller to provide the needed timing signals.

• Ignition Coil: Converts low-voltage signals into high-voltage pulses.
• Microcontroller or Ignition Module: Controls the timing of when each coil fires.
• Switching Device (e.g., NPN transistor or MOSFET): Used for rapidly switching the coil on and off.
• Power Supply: 12V automotive battery or another suitable power source.
• Diode: Used for flyback protection to prevent back EMF from damaging other components.

1. Power Supply:
   • Connect the positive terminal of the power supply to the positive side of each ignition coil.
   • Connect the ground of the power supply to the common ground for all components.
2. Microcontroller or Ignition Module:
   • Connect the output control signal from the microcontroller to the base/gate of the switching device.
3. Switching Device:
   • Connect the collector/drain of the transistor/MOSFET to the negative terminal of the ignition coil.
   • Connect the emitter/source of the transistor/MOSFET to ground.
4. Flyback Diode:
   • Connect the cathode of the diode to the positive side of the ignition coil.
   • Connect the anode of the diode to the negative side of the ignition coil.

• Microcontroller Pin → Base of NPN Transistor
• Ignition Coil - Negative → Collector of NPN Transistor
• Ground → Emitter of NPN Transistor
• Diode Cathode → Coil Positive / Power
• Diode Anode → Coil Negative / Transistor Collector

• Ensure the microcontroller can handle the timing precision needed for the ignition process.
• Use appropriate transistors or MOSFETs rated to handle the current and voltage of your ignition coils.
• Employ protection components like fuses to prevent damage from electrical surges.

graph TD;
    A[Phoenix Contact DPDT Relay<br>Part: MIN RELAY, 2 PDT, 24 VDC] --> COIL_A1[COIL_1<br>Pin: A1];
    A --> COIL_A2[COIL_2<br>Pin: A2];
    A --> COM_1_PIN[COM_1<br>Pin: 11];
    A --> NC_1_PIN[NC_1<br>Pin: 12];
    A --> NO_1_PIN[NO_1<br>Pin: 14];
    A --> COM_2_PIN[COM_2<br>Pin: 21];
    A --> NC_2_PIN[NC_2<br>Pin: 22];
    A --> NO_2_PIN[NO_2<br>Pin: 24];