Woodstock Low Power
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02-05-2018, 04:36 PM
(This post was last modified: 02-05-2018 04:38 PM by Maximilian Hohmann.)
Post: #93
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RE: Woodstock Low Power
Hello Bernhard,
(02-04-2018 06:01 PM)PANAMATIK Wrote: But it could be necessary to remove the ACT chip anyway, I got some feedback that it consumed 2 mA while in sleep mode when the ACT is not removed, drawn presumably via the keyboard lines. Mine drew almost 17mA when in sleep mode! I now proceeded and removed all easily accessible components from the board (namely the ACT and the RAM/ROM chips but also the remainder of the switching power supply). Only a few parts around the display now remain in place, some resistors and a diode I think. But it still draws constant 5mA in sleep mode. What can that be? I disconnected the hotwired "+" from both the GPS module (where it preserves the last position in memory and maybe also keeps the clock running I suppose) and the voltage converter but there was no noticeable difference. And I am still not able to get a GPS fix. I tried to keep it running for long enough but it always turned the GPS off by itself before it could get a valid position. To cope with the initial current draw of the voltage converter I even soldered a 5.5V 1F supercapacitor/"gold cap" across the battery contacts but this made no difference. For batteries I now use a pair of lightly used alkalines which the calculator itself measures with 2,9V. Anything else I can try here? Regards Max |
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