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author | Uwe Freese <thebreaker@rockbox.org> | 2002-12-10 23:14:04 +0000 |
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committer | Uwe Freese <thebreaker@rockbox.org> | 2002-12-10 23:14:04 +0000 |
commit | c9743e2c18b2c39cd8de9a3db909e129df4d904d (patch) | |
tree | d68d1f7026d453fb74258124737e1a30304fd052 | |
parent | b17fe5a72722352747111bcb188b4821135ce0b6 (diff) | |
download | rockbox-c9743e2c18b2c39cd8de9a3db909e129df4d904d.tar.gz rockbox-c9743e2c18b2c39cd8de9a3db909e129df4d904d.zip |
changed answer about using other chargers
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2969 a1c6a512-1295-4272-9138-f99709370657
-rw-r--r-- | docs/BATTERY-FAQ | 44 |
1 files changed, 34 insertions, 10 deletions
diff --git a/docs/BATTERY-FAQ b/docs/BATTERY-FAQ index 29a1add634..07a7e3784b 100644 --- a/docs/BATTERY-FAQ +++ b/docs/BATTERY-FAQ | |||
@@ -105,21 +105,46 @@ A10: The short answer is: Using a different charger will void your warranty | |||
105 | with similar specifications as the stock charger. The charger must | 105 | with similar specifications as the stock charger. The charger must |
106 | have the same kind of connector with same polarity (center positive/+). | 106 | have the same kind of connector with same polarity (center positive/+). |
107 | The charger should supply at least 7-8 volts, and if it provides | 107 | The charger should supply at least 7-8 volts, and if it provides |
108 | more than 10V, it probably should be regulated to 9V (do not | 108 | more than 10V, it probably should be regulated to 10V (do not |
109 | directly plug it in your 12V car battery or it's charger!). | 109 | directly plug it in your 12V car battery or it's charger!). |
110 | The universal travel charger sold by Archos is specified at | 110 | The universal travel charger sold by Archos is specified at |
111 | 12V, 1.2A so that's probably the maximum rating you should use. | 111 | 12V, 1.2A so that's probably the maximum rating you should use. |
112 | A good circuit for powering from a car battery or other source | 112 | A good circuit for powering from a car battery or other source |
113 | with a higher voltage would be a 600 mA fuse and a 9V regulator like | 113 | with a higher voltage would be a 600 mA fuse and a 10V regulator like |
114 | a 7809 of your favourite manufacturer in series. | 114 | a 7810 of your favourite manufacturer in series. |
115 | 115 | ||
116 | Using lower charging voltage will slow down the charging, and using | ||
117 | higher voltage will cause a higher charging current, more heat, | ||
118 | and too much heat and current can damage the batteries or the unit. | ||
119 | Inside the Jukebox there is a regulator which limits the charging | 116 | Inside the Jukebox there is a regulator which limits the charging |
120 | voltage applied to the batteries (which in turn limits the current | 117 | current applied to the batteries. The higher the input voltage, the hotter |
121 | - the usual ohm's law applies: current = voltage / resistance) but | 118 | this IC gets. Don't use an input voltage above 12V. |
122 | if a high input voltage is applied, the regulator will heat up a lot! | 119 | Using lower charging voltage < 10V will slow down the charging. But the |
120 | rockbox charging algorithm should work then, too. | ||
121 | |||
122 | These are the output voltages of an original archos power supply: | ||
123 | - connected to AJB Recorder, not charging: 13,7 Volt | ||
124 | - connected to AJB Recorder, charging: going down to 10,4 Volt | ||
125 | |||
126 | Here is how changing the input voltage changes the charging current: | ||
127 | |||
128 | voltage charging current (limited only by the AJB) | ||
129 | ------------------------------------------------------ | ||
130 | 7,0V 10 mA | ||
131 | 7,5V 30 mA | ||
132 | 8,0V 50 mA | ||
133 | 8,5V 70 mA | ||
134 | 9,0V 140 mA | ||
135 | 9,5V 250 mA | ||
136 | 10,0V 330 mA | ||
137 | 10,5V 350 mA | ||
138 | 11,0V 350 mA | ||
139 | 11,5V 350 mA | ||
140 | 12,0V 350 mA | ||
141 | |||
142 | To summarize: | ||
143 | |||
144 | - do not use an input voltage > 12V | ||
145 | - optimal input voltage is 10V (regulated) | ||
146 | - use a fuse of ~600mA | ||
147 | - using a different charger voids your warrenty | ||
123 | 148 | ||
124 | Many people are happy using an external quick charger which | 149 | Many people are happy using an external quick charger which |
125 | is specified to work with NiMH batteries. This is completely safe | 150 | is specified to work with NiMH batteries. This is completely safe |
@@ -137,7 +162,6 @@ A11: The FAQ on the Archos web site and the top of the charger both read: | |||
137 | Chargers with similar (or user-adjustable) properties are available | 162 | Chargers with similar (or user-adjustable) properties are available |
138 | at shops selling consumer electronics. | 163 | at shops selling consumer electronics. |
139 | 164 | ||
140 | |||
141 | Q12: I often need to stop my player for about 15 minutes or so, and when I do | 165 | Q12: I often need to stop my player for about 15 minutes or so, and when I do |
142 | it runs off it's batteries. I was wondering, which is best: shutting the | 166 | it runs off it's batteries. I was wondering, which is best: shutting the |
143 | player down completely and rebooting it when I want to listen again, or | 167 | player down completely and rebooting it when I want to listen again, or |