Re: [CAD_CAM_EDM_DRO] Re: Enclosures and Power supplies

On Thu, 02 Oct 2003 11:33:21 -0000, you wrote:

>Hello,
>
>As has been mentioned here recently, an LM317 regulator can work at
>these voltages...
>
>And I've mentioned a few times doing a two-step process using a 7824
>or first (running a fan from it perhaps), and feeding the 24 into the
>7805...
>
>Hope this helps,

I know the circuit involved, so the problem is not so much the input
voltage (max 35 volts for the chip) but the power dissipation.
Physically, it's a bit awkward to fit a heatsink on that chip,
although it can be done. A previous discussion included the
suggestion that if there was a 5 volt supply available, such as from a
computer power supply, the 5 volts from it could be used.

Personally, I like somewhat conservative designs, so the idea of
running the 5 volt chip from the regulated 24 volts, given no other
choice in the matter, would be reasonable, although I'd suggest an 18
volt regulator chip to spread the heat around.

Harvey

>
>Ballendo
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
>wrote:
><snip> The 30 volt supplies will be ok for the motors, voltage wise,
>but a
>> bit high for the 5 volt regulators, which would prefer about 8 to
>12.
>>
>>
>
>
>
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