From: John Woodgate
Subject: Re: Triac Hack?
Date: Mon, 23 Sep 2002 16:50:53 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 23 Sep 2002 16:14:32 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that John Woodgate wrote (in ) about 'Triac
Hack?', on Mon, 23 Sep 2002:
>You need a lower resistance-value pot and two fixed resistors. The sum
>of the three resistances must be near the value of the original pot. You
>replace the original pot by resistor-new pot-resistor, keeping the pot
>slider connection unchanged. This reduces the speed range you can get.
>Without a LOT more information (some of which you are unlikely to be
>able to provide), one can't suggest resistance values.
>Just as an example, you might replace a 100 k ohm pot by a 47 kohm
>resistor, a 25 kohm pot and a 27 kohm resistor, totalling 99 kohms, and
>giving *very roughly* the middle quarter of the speed control range.
On reading your earlier posts again, you need a pot of around a quarter
of the value of the existing one, and a resistor of 3/4 value to make up
the rest. Make sure you put the resistor in series with the low-speed'
end of the pot.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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