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L-CHEAPO IGNITION SYSTEM |
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This 6 volt circuit is a real battery saver. If your motor stops
with current flowing to the coil, it times out in less than one second and current stops flowing. If you are using a
hit-miss motor you can save even more battery by adding Q4 to sense when the exhaust valve is closed. Q3 and Q4 are used
instead of points. Q3 and Q4 are Hall effect transistors and are operated by the passing of a small magnet. You can set the timing by
the led or by removing the spark plug and watching the spark (the plug threads need to be touching the motor frame).
Below is a list of parts and where to find them. (Do not use a soldering iron larger than 30 Watts).
How to solder. |
| If you wish to use points instead of a hall effect sensor, connect your points to ground and the IN connection on the circuit board. The spark will fire when the points close. |  |
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To the left is the layout for the L-Cheapo Ignition system. When your points make, you see only one hot spark but in reality this circuit is pumping out two to eight sparks depending on the speed of your motor. |
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1 - Transistor Q1 - TIP120 1 - Transistor Q2 - 2N3906 2 - *Hall Trans. Q3 and Q4 - SS411A 1 - Timer IC1 555 1 - Switch Mini SPDT |
3 - Resistors 4.7K Ohm (Yellow-Violet-Red) 1 - Resistor 330 Ohm (Orange-Orange-Brown) 1 - Resistor 27K Ohm (Red-Violet-Orange) 1 - Resistor 10K Ohm (Brown-Black-Orangr) 1 - Battery Jack 2.5mm |
2 - Capacitor .1uf 1 - Capacitor 4.7uf 1 - Led (Red) 1 - 8 Pin IC Socket 1 - Coil 6 Volt Picture |
Most of the small parts you can get at JDR Microdevices for prices that are hard to beat.
* In the drawing at the top of this page you will see that Q3 and Q4 are shown as 3030T. The 3030T is outdated
and has been replaced with UGL3132AU which is hard to find, so we have changed
Q3 and Q4 to SS411A.
For information about mounting the hall effect transistor and magnet, click here.
| DESCRIPTION | PART NO. | SOURCE | APPROX. COST |
|---|---|---|---|
| 2N3906 PNP Transistor | 2N3906 | JDR Microdevices | $0.06 |
| NE555 Timer | 595-NE555P | Mouser Electronics | $0.40 |
| SS411A Hall Effect Sensor | 785-SS411A | Mouser Electronics | $1.95 |
| TIP120 NPN Transistor | TIP120 | JDR Microdevices | $0.39 |
| Magnet Neodymium 4 by 1.5 mm | 43512 | Indigo Instruments | $0.14 |
| 4.7K 1/4 Watt Resistor | none | JDR Microdevices | $0.05 |
| 10K 1/4 Watt Resistor | none | JDR Microdevices | $0.05 |
| 27K 1/4 Watt Resistor | none | JDR Microdevices | $0.05 |
| 330 Ohm 1/4 Watt Resistor | none | JDR Microdevices | $0.05 |
| .1uf 50V Capacitor | NA | JDR Microdevices | $0.07 |
| 4.7uf 100V Radial Capacitor | 4.7R100 | JDR Microdevices | $0.07 |
| LED Red Diffused Size 3 MM | LED101 | JDR Microdevices | $0.15 |
| Mini Toggle Switch SPST | 8013 | JDR Microdevices | $1.25 |
| PC BOARD | RS276-159 | Radio Shack | $1.69 for 2 |
| BATTERY 6 Volt 4.5 Amp-Hour | 632-GH645 | Mouser Electronics | $7.58 |
| 6VDC 1.5A (or less) WALL PLUG TRANSFORMER (makes a great, inexpensive battry charger). |
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| IGNITION COIL Artic Cat - Very hot spark |
01-083 | MFGsupply.com | $21.95 |
Click on thumbnails for larger pictures and more information.
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| 2N3906 - LED Red - TIP120 |
Picture of finished Circuit board
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Hall Effect Test Station. |
Finished Test Station Ignition Coil Wiring |