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RE: OT: Electronics advice needed to make a combined eme rgency
charger / USB supply lead for my PDA
- Subject: RE: OT: Electronics advice needed to make a combined
eme rgency charger / USB supply lead for my PDA
- From: "Ward, David" <DAvid.Ward@xxxxxxxxxx>
- Date: Thu, 15 Jul 2004 08:40:34 +0100
Doh!
Good point Jon!
/ahem/ deliberate mistake ;-)
Dave
-----Original Message-----
From: Jon Whiten [mailto:jon@xxxxxxx]
Sent: 14 July 2004 20:01
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] OT: Electronics advice needed to make a combined
emergency charger / USB supply lead for my PDA
Just butting In....
Would this not work better if D2 was moved form the joint of D1-R2 to the
joint R2-Fuse so as not to have the charging resistor in the circuit path
when using the PDA on battery power?
Regards
Jon Whiten
http://www.whiten.co.uk
-----Original Message-----
From: Ward, David [mailto:DAvid.Ward@xxxxxxx]
Sent: Wednesday, July 14, 2004 5:46 PM
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] OT: Electronics advice needed to make a combined
emergency charger / USB supply lead for my PDA
just a couple of small changes
+-------------------[D3]--+
----------+-[D1]-+------------[D2]--+
[R1] [R2]
+5V [LED] [FUSE]
>From
USB (+)
4x 1.2v (+4.8v) (+)
Rechargeable PDA
AAA (-)
(-)
Common
----------+------+------------------+
<snip>
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