[GreenKeys] Fw: Fw: model 15 motor curiosity

[Bruce Gentry]

R/C arc supressors are often used to allow a switch rated for 60 cycle 
AC to be used for DC or 25 cycle AC at a reduced current from the 
rating. A switch intended for 120 volts DC has to have some sort of  
magnetic blowout or a very long contact travel to snuff the arc when the 
switch opens unless other external methods are used. For 60 cycle AC, 
the R/C network can be disconnected, but it is still best to use it 
because it greatly reduces wear on the switch contacts. If you want to 
keep the supressor, use a quality mylar condensor rated for at least 600 
volts DC   and a flameproof resistor  to replace the original ones.

       Bruce Gentry, KA2IVY

On 8/28/16 10:03 AM, Thomas Tillson via GreenKeys wrote:
> Strange as it may seem, the same thing happened to me.
> As stated, I clipped the wire from the switch on the resistor taped it 
> and tucked it away.
> Works fine now.  :-)
> TT
> In a message dated 8/28/2016 9:37:54 A.M. Eastern Daylight Time, 
> epvgk at limpoc.com writes:
>
>     Same here, I removed those on mine after the cap had a slow
>     meltdown while powered offs. Probably safest to remove or replace
>     to avoid potential fire hazard, too.
>
>     On August 28, 2016 9:15:48 AM EDT, JC White <jcw1231 at pacbell.net>
>     wrote:
>     >Yes that cap being shorted could allow sufficient current to flow to
>     >cause the motor to hum.  The cap and resistor are for spark
>     suppression
>     >when the switch is opened with current flowing and is probably not
>     >necessary so the pair can be removed...  they do not exist in any
>     of my
>     >four 15s...
>     >
>     >
>     >
>     >----- Forwarded Message -----
>     > From: simon <simski at dds.nl>
>     > To: JC White <jcw1231 at pacbell.net>
>     > Sent: Sunday, August 28, 2016 12:47 AM
>     > Subject: Re: [GreenKeys] Fw: model 15 motor curiosity
>     >
>     >well, that is the strange part. according to the schematic in
>     >2217wd.pdf, there is a 5ohm resistor and a 1uf capacitor in series,
>     >across the switch contacts via one of the 300ohm resistors. I
>     have no
>     >idea of their function, but my suspect is that the 1 uf is
>     shorted. i
>     >will take it out of the wiring and see what happens...
>     >
>     >
>     >
>     >
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