From: Mike Poulton
Subject: Re: 12 vdc to 6vdc @ 30amps
Date: 13 Sep 2002 15:32:50 GMT
Organization: MTP Technologies
References: <firstname.lastname@example.org> <email@example.com>
On 13 Sep 2002, "Spehro Pefhany" said:
> The renowned Winfield Hill wrote:
>> What!! No heat sink!! You wimps, my circuit dissipates heat
>> like a man's power regulator should, up to 325 watts!! Put
>> that in your pipe and smoke it! Or put your pipe on the heat
>> sink and it'll smoke, or ....
> I bow to your massive and manly heatsink festooned with 2N3055s and
> ballast resistors.
> By cross milling channels into mating halves of the heatsink, and
> hinging it, we could have a workable waffle maker. And the motor could
> be used to mix the batter. It's all coming together. A timer driven by
> a nice synchronous AC motor, some big oil-filled chassis mount
> capacitors for one thing or the other, terminal strips soldered with a
> 250W Weller gun. Yes! We have the technology.
> Best regards,
> Spehro Pefhany
Ha! Who uses semiconductors to regulate voltage? You don't need none
of that newfangled silicon stuff! A plain old variable resistor with a
servo drive will work just fine. I'd go with a 0.5 ohm wirewound
resistor on a huge ceramic tube form. Put 12V across the resistor.
Hook a big solenoid in parallel with the motor, from the resistor tap to
ground, and make it push against a spring to move the tap. Cool with a
leaf blower. :-)
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