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'Voltage Requirements for ICD?'
1999\10\31@214320 by John Hansen

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<x-flowed>I noticed the Microchip ICD specifies 9 volts to power it.  I also noticed
that right next to the power jack, however, is a 7805 regulator, so I began
to wonder if I could run it off a standard 12 volt supply (I've been using
a 9 volt battery).  Checking the schematic, I see that 9 volts was indeed
drawn off before the regulator, but I can't find anywhere on the set of
schematics that actually uses this voltage level.  Has anyone tried running
an ICD from a standard 12-13 volt supply?

John Hansen

</x-flowed>

1999\10\31@225227 by paulb

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John Hansen wrote:

> Checking the schematic, I see that 9 volts was indeed drawn off before
> the regulator, but I can't find anywhere on the set of schematics that
> actually uses this voltage level.

 Probably for RS-232.  I haven't looked at the thing (haven't got one).

>  Has anyone tried running an ICD from a standard 12-13 volt supply?

 No, but put your finger on the 7812.  If you get burnt, bolt a
heatsink to it.
--
 Cheers,
       Paul B.

1999\10\31@234738 by Dennis Plunkett

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At 21:40 31/10/99 -0400, you wrote:
>I noticed the Microchip ICD specifies 9 volts to power it.  I also noticed
>that right next to the power jack, however, is a 7805 regulator, so I began
>to wonder if I could run it off a standard 12 volt supply (I've been using
>a 9 volt battery).  Checking the schematic, I see that 9 volts was indeed
>drawn off before the regulator, but I can't find anywhere on the set of
>schematics that actually uses this voltage level.  Has anyone tried running
>an ICD from a standard 12-13 volt supply?
>
>John Hansen
>
>

The 9V is just so that the cheap 7805 has enough headroom for voltage
dropout (Around 2V if I recall, and 7V wall warts are hard to come by,
where as 9 is not). The 12V wall wart will do the job. I don't think that a
heatsink on the regulator is required in this case

Dennis

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