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river Forums Junkie Location: Land of Oz Registered: June 2004	Re: Electronic gurus Tue, 05 October 2004 12:19 Hi, Resistors are okay, but a little crude. They will get hot, unless you get a big wattage unit and consume power - ie generate heat. Better idea is to have a voltage regulator to supply lower voltage. You'll need a TO3-case regulator 'cos I'm sure the pump will pull a few amps. You can adjust the voltage output by changing the resistor values for the regulator. THese are just ordinary 1/2W resistors and won't run hot - though the reg will get warm under load, so better use a heatsink. The PWM idea is good also. I think Jaycar had a speed controller kit, based on PWM for electric drill motors and it handles a few amps. So, you could use that kit as is - just leave the speed knob (when you decide what speed you want the motor to turn) on the one setting, or replace the pot for the speed control with a fixed resistor - once you've established the speed you want. seeyuzz river [Report message to a moderator]

	Subject	Poster	Date
	Electronic gurus	TurboRA28	Tue, 05 October 2004 11:45
	Re: Electronic gurus	shinybluesteel	Tue, 05 October 2004 11:55
	Re: Electronic gurus	sideshow	Tue, 05 October 2004 12:00
	Re: Electronic gurus	river	Tue, 05 October 2004 12:19
	Re: Electronic gurus	Cool1	Tue, 05 October 2004 12:27
	Re: Electronic gurus	THE WITZL	Tue, 05 October 2004 12:35
	Re: Electronic gurus	mrshin	Tue, 05 October 2004 14:05
	Re: Electronic gurus	TurboRA28	Tue, 05 October 2004 23:43
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 05:38
	Re: Electronic gurus	TurboRA28	Tue, 05 October 2004 23:50
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 00:17
	Re: Electronic gurus	brett_celicacoupe	Wed, 06 October 2004 01:05
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:04
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 02:21
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:27
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 02:40
	Re: Electronic gurus	CrUZsida	Wed, 06 October 2004 03:04
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:50
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 03:00
	Re: Electronic gurus	M.W.P.	Wed, 06 October 2004 03:13
	Re: Electronic gurus	brett_celicacoupe	Wed, 06 October 2004 04:07
	Re: Electronic gurus	river	Wed, 06 October 2004 05:38
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 06:02
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 06:13
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 06:38
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 07:22

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