bertsmobile1
Lawn Royalty
- Joined
- Nov 29, 2014
- Threads
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Hall effect trigger 101.
Back in the early 60's when transistors were invented a bright spark worked out you could use them to replace the points on an engine.
What happens is when the magnet passes by the coils it generates a voltage.
However this starts at 0 V rises to the maxium then goes down to the same Voltage negative then back to 0 .
If you measure the inital rising voltage you can set the electronic switch ( transistor ) to ground the coil when the voltage is at or near its peak which mechanically is the same as closing the points to allow the voltage in the coil to discharge through the spark plug .
You can do all sorts of fancy things as well but basically that is it .
At first the timing chip was a stand alone item which made ignition coils very cheap.
Then some bright spark ( probably with an MBA ) worked out you could encase the chip within the coil thus a magneto coil became a magneto module and become unique to your engine thus by adding the chip which costs around 5 ¢ you add $ 40 to the end price .
The voltage measured by the trigger chip which is connected to the kill wire is in the micro volt range so shoving battery voltage down it is the equivalent to plugging a 110 V device into a 220 V outlet.
Poof and the magic smoke escapes .
Also because of the chip, the coils ( modules ) are polarity sensitive so if fitted upside down will not work at best and be destroyed at worse .
Because this voltage is so low on 2 cylinder engines that have a common kill wire the first magneto coil can send a signal to the second which causes a missfire so a diode was put in the wire that goes between them .
latter this was added to the chips
Back in the early 60's when transistors were invented a bright spark worked out you could use them to replace the points on an engine.
What happens is when the magnet passes by the coils it generates a voltage.
However this starts at 0 V rises to the maxium then goes down to the same Voltage negative then back to 0 .
If you measure the inital rising voltage you can set the electronic switch ( transistor ) to ground the coil when the voltage is at or near its peak which mechanically is the same as closing the points to allow the voltage in the coil to discharge through the spark plug .
You can do all sorts of fancy things as well but basically that is it .
At first the timing chip was a stand alone item which made ignition coils very cheap.
Then some bright spark ( probably with an MBA ) worked out you could encase the chip within the coil thus a magneto coil became a magneto module and become unique to your engine thus by adding the chip which costs around 5 ¢ you add $ 40 to the end price .
The voltage measured by the trigger chip which is connected to the kill wire is in the micro volt range so shoving battery voltage down it is the equivalent to plugging a 110 V device into a 220 V outlet.
Poof and the magic smoke escapes .
Also because of the chip, the coils ( modules ) are polarity sensitive so if fitted upside down will not work at best and be destroyed at worse .
Because this voltage is so low on 2 cylinder engines that have a common kill wire the first magneto coil can send a signal to the second which causes a missfire so a diode was put in the wire that goes between them .
latter this was added to the chips
