On 12/27/2010 12:40 AM, Jim Thomson wrote:
> ## Kilovac engs told me years ago, If you are limited with vdc...and you
> want to speed up a 26.5 vdc relay.... then simply
> use the 12 vdc version instead. With 24-30 vdc applied with a simple drop
> resistor..they operate blazing fast. If you want em still
> faster, then use a small 50 uf lytic across the drop resistor, then it
> becomes a 'RC hot shot circuit' . If you have +48 vdc available,
> you are laughing.
The drop resistor with 2X voltage only gives half as much
speed up as the K6XX circuit I cited. However, you cannot
speed it up by going to still higher voltages because
it is limited by contact bounce at that point.
> ## I had no problems with building a +120 vdc supply, using a FWD..for use
> with speeding up a 26.5 vdc vac relay. I use a
Rich Measures assumed the user would have a 90V grid bias supply for
free. I don't have that but I already have 12V in the shack.
> Later.... Jim VE7RF
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