Hi everyone,

I started a new topic and ask if you can please have a look: http://www.overunity.com/index.php/topic,5621.msg127695.html#msg127695

Luc

Hi everyone,

I've completed the design and testing of a twin Hall effect control for the CDI system I've built. The diagram shows looking down into the distributor with cap and rotor removed. It's somewhat pictorial. One hall effect sensor is for the charge pulse and the other is for the discharge pulse. The 2.2k ohm resistors play a dual role. First, each acts as a pull-up resistor. When one of the magnets (little squares on the rotor) passes by the sensor, the 'minus' wire from the sensor goes to high impedance and the 2.2k resistor yanks the 'plus' side of the Mosfet opto up and turning the Mosfet "on". When the window has passed, the sensor yanks it to ground and the Mosfet is turned "off" again. The other purpose of the 2.2k resistor is as a current limiter for the Mosfet's opto. circuitry.

This can also be accomplished with just one sensor but would require a "break before make" inverted signal for the opposite circuit. It's easier to add a sensor and resistor than it is to design, build and troubleshoot a circuit ... for me anyway.

Peace,

Greg

@apcwzrd,

I fully agree, the battery minus and the engine ground is the same.

Another way to test the ignition voltage polarity is to first use one diode string connected to one spark plug.
Then you put the end of the diode string near the engine ground. If a spark is jumping from the diode
string then the diode string is the wrong way around.

Groundloop.

@Groundloop,

I'm going to build your high voltage polarity tester, just wondering if you have tried this ....

Regards,

HV

Quote from: Groundloop on September 23, 2008, 12:05:48 AM
@apcwzrd,

I fully agree, the battery minus and the engine ground is the same.

Another way to test the ignition voltage polarity is to first use one diode string connected to one spark plug.
Then you put the end of the diode string near the engine ground. If a spark is jumping from the diode
string then the diode string is the wrong way around.

Groundloop.

Groundloop

Thanks for the verification and a super simple way to test whether the diodes are oriented correctly. I will try it tomorrow. Funny how the simplest solutions work the best.

Cheers,
Tom