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[aprssig] Positive Earth RC-D710?

Earl Needham needhame1 at plateautel.net
Tue Sep 30 02:11:16 UTC 2008


Robert Bruninga wrote:
<snip>
>> Positive Earth RC-D710? 
>> www.aprs.org/D710-HT.html Does not have a diode in the supply.
>> www.ew.usna.edu/~bruninga/aprs/RC-D710-connx-pwr.GIF Has a
> diode in...
> 
> Thanks Dave!
> 
> I have now added the reverse diode protection  to protect the
> Display Head if you connect power up backwards.  (Always use a
> fuse, otherwise the diode gives no protection).

	If you were to use a full-wave bridge rectifier, you could connect the 
power either way and operate just fine.  Might lose a little voltage, 
though...

	7 3
	Earl
-- 
KD5XB -- Earl Needham
Clovis, New Mexico DM84jk
http://groups.yahoo.com/group/cw_bugs
Quoting from the Coast Guard: ZUT




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