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Old 24th Oct 2017, 12:28 pm   #46
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
Default Re: Variac help please

Quote:
Originally Posted by Argus25 View Post

One trick, if you want to get fancy, is to have a timer with a relay contact that shorts the NTC out a few seconds after switch on. You can make a timer just from a diode, resistor, capacitor and a relay, no semiconductors needed.

Only if the diode's thermionic!


And if it is indirectly heated, it'll do a delay on characteristic all on its own
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