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Very nice dynamos ... Reminiscent of a Mather & Platt I once knew.Are they 3-brush? Can't quite see.Dave
OK Graham I'll have to bring it up to show you when it has been painted and properly set up. Mike C called in this afternoon to see the Retlas running and to try out his Garretson demand valve on my engine - it ran just the same as with my home made valve. However, the Hall Effect sensor of my Minimag ignition system packed up, rather annoying as it has only lasted for about ten hours use. I was able to substitute a sensor from old RHC system that has different coloured wires but after some trial and error wiring set ups I got the engine running again. I like the compact Minimag system but they charge £15 for a replacement Hall Effect Sensor kit, perhaps I was unlucky but I'm now looking for a cheaper source in case that happens again. The blown sensor is marked 451S OGL. As the Minimag system operates on two AA batteries I assume I need a sensor that is rated for a range starting at around 3V.Looking on-line I see RS sell a Honeywell SS460S Sensor 'switching current 20 mA supply voltage 3 → 24 V dc' for £0.65and another Honeywell SS49E-F 'current 1.5 mA supply voltage 2.7 → 6.5 V dc' for £2.48.Can anybody interpret what make and model the defective sensor marked 451s OGL is and suggest a source (preferably UK) or advise me whether the choice of sensor is critical?Thanks Andy
However you lose me when you say, "The o/p switches low with a south pole to the active face", I don't know how my blown sensor switched.
Graham:Batteries won't produce spikes in themselves. The spark current can.Are we looking at one of these ??http://minimagneto.co.uk/documents/MCL-1.pdfI can find no sensible reference searching for the MHS-LV ?? Does not look like any sort of device ID to me ... That CPC item should work @ 3V anyway.I will continue when I've done scraping the bituminous paint off me paws ... knew I should have used gloves ... Dave