On 1 May 2006, at 20:58, Declan Moriarty wrote:
>> 9V is perfect for feeding a 7805 but it's an 'odd' voltage for a
>> switch to run
>> on directly, so worth checking.
>> Is this still going around?
>> 7809s are rare & old.
Oh dear - so my electronics knowledge is getting obsolete - bummer.
But why did you mention this? You're the first to mention 7809s in
this discussion.
> They standardised on 7805, 7808. Get the 7808, put approx 500 ohms
> (some) or 1K (the rest) in the GROUND pin and you have 9V.
That's cute - how are you meant to know which to to use? Put in two
1Ks || and measure the output, and if it's not 9v, snip out one of
the 1Ks ?
Niall
P.S. I know it was marked [OT] from the start, but this has gone so
far OT it's in danger of straying back ON topic somehow.
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