[ROVERNET - UK] Mixture problems-resolved, sort of...

David Read defender110 at ozemail.com.au
Mon Oct 22 09:28:04 BST 2007

Ah yes, the joys of dynamo's ;-)

At 11.8v, I doubt if the battery would be capable of cranking the engine.

Driven by a snap action Hall effect pickup, it is very rare, almost 
unheard of, that the transistor will be partially closed.

The heat developed within the small un-heatsinked? switching transistor 
with any substantial volt drop would soon destroy it. 1v x 5A peak 
current = 5W peak

Not sure if the PerTronics mounting tab is also the transistor heatsink.

South Oz

Netspace wrote:
> If the Pertronix is not working correctly, it could have much too high a 
> voltage drop across the switching transistor.
> It should be 0.25V (normal saturated npn), but if it was 1v with a 
> battery at 11.8v then you would have a weak spark.  Flat batteries are 
> 11.5v

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