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Subject: charger test results
From: Uwe Freese (mail_at_uwe-freese.de)
Date: 2002-08-29


Hello,

For improving the battery FAQ, I now made some tests with the charger
and have maybe interesting new results:

AJB model: Recorder 20
Archos charger model: "AC Adaptor, KA23D090060035G, 9,0V= 600mA Ext. 230 V~ 50 Hz"
Voltage of Batteries when tested: ~ 5,2 V (charging current depends on
battery voltage a little bit)

Archos charger tests

Connected to AJB Recorder, not charging: 13,7 Volt
Connected to AJB Recorder, charging: going down to 10,4 Volt,
                                     charging with 320 mA

External Adjustable Power Supply tests

Voltage charging current (limited only by the AJB)

7,0V 10 mA
7,5V 30 mA
8,0V 50 mA
8,5V 70 mA
9,0V 140 mA
9,5V 250 mA
10,0V 330 mA
10,5V 350 mA
11,0V 350 mA
11,5V 350 mA
12,0V 350 mA

So I guess the car charger is only a connection to 12 V with a fuse.

I personally would therefore use a 10V regulator 7810 (low drop,
because the voltage difference to the car battery voltage is low) with
a 500mA fuse, because the charging current is the same as at 12V, 10 V
is below my original archos supply and should be really safe. And with
10 V input, the DCDC regulator in the archos shouldn't get so hot as
with 12 V (but it should work, too).

Bye, Uwe.



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