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Return to top of page · Post #: 16 · Written at 6:33:46 AM on 8 December 2012.
	Brad Administrator Location: Naremburn, NSW Member since 15 November 2005 Member #: 1 Postcount: 7303
There is a good website cool386 (sorry don't know how to paste links) which has a lot of useful info on vibrators. Just copy/paste or type the link. I'll change it to a hyperlink once I pass by it. The new forums will do this automatically. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ A valve a day keeps the transistor away...

Return to top of page · Post #: 17 · Written at 6:36:12 AM on 8 December 2012.
	Simplex Location: Bathurst, NSW Member since 7 August 2008 Member #: 336 Postcount: 391
In the Ferris there is a tuned RC seris network, a 0.1μF and a 20 ohm resistor across the contacts. The parts list specifies a 200v rating cap. I used 630v rated metallised polyesters, the yellow ones from Evatco which I generally use in rebuilds. Thanks for the tip on links, will try it out. Cheers

Return to top of page · Post #: 18 · Written at 11:02:06 PM on 8 December 2012.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5254
That may be a way of quenching the spark & lowering the back emf? Generally the back emf of vibrators & kettering ignition can be hundreds of volts. This is quite often not realised. That spike in an ignition is not going to damage a globe but can damage solid state stuff. Marc

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