From: Lizard Blizzard
Subject: Re: V regulator input cap size?
Date: Tue, 22 Oct 2002 12:19:16 -0700
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> On Tue, 22 Oct 2002 09:39:51 +0100, John Woodgate
>>I read in sci.electronics.design that DaveC wrote (in
>><0001HW.B9DA3AFA00342030163F7590@news.covad.net>) about 'V regulator
>>input cap size?', on Mon, 21 Oct 2002:
>>>How about a simple voltage divider across the 35vac liine? Say, divide such
>>>that one of the resistors has 20 volts across it. It won't be the example of
>>>efficient use of energy, but the circuit doesn't use more than about 300mA at
>>>Is this a do-able solution?
>>Well, sort of, but you get lots of heat. Is the 300 mA constant? If so,
>>you can simply put a resistor in series with the bridge rectifier, on
>>the AC side. This also changes the operation of the rectifier to more
>>nearly a current-fed type. You would need to drop 20 V at around 500 mA,
>>which is 40 ohms, 10 W. Not elegant, but possible.
> If it's a constant current why not use a suitable 24volt automotive
> globe? - gives you a visual indication of On/Off as well!
If the light runs bright enough to be seen easily, then it will
eventually burn out.
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