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    Simple serial to IrDa

    Hi, hope this is the right place to ask for advice. I use a GPS with my pocket pc via serial cable. It is a simple connection with only 3 cables. Now I moved to a Palm Tungsten T|X. By the documentation it seems the serial wiring is not that simple and not really a standard serial connection...
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    Electrostatic generator?

    Sorry if this is not the right place... I totally don't know where to put this. It is a mixed idea and question as I'm no expert in this field., Ok, so: 1. I have seen electrostatic generators claiming to generate lots of power (van de Graaf) The thing is this we can only get big sparks and...
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    Proximity alarm for camping

    Sometimes it is hard to find a nice and safe place to camp. I've been there... and while you need to rest, you pray to be aware when somebody or something is approaching to your tent in the wild. So I recalled this "burglar alarm" I saw on a electronic book years ago. Instead of using a battery...
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    Reducing 6.4V 2,700mah for a pda (ext battery)

    Audioguru, Ante, Thanks guys! I tried with 4 diodes in series and, even that the multimeter reported 5.2+V, didn´t work to charge the PDA (it has a LED indicating "charing"...), I tired with less diodes and it worked, but didn't charge while using the PDA. So, I used only ONE diode...
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    Reducing 6.4V 2,700mah for a pda (ext battery)

    ;D LOL, thanks, I will try today how it works
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    Reducing 6.4V 2,700mah for a pda (ext battery)

    By the way, the diodes didn't get hot at all. From what I have read, the diodes should take like 0.7V, but when I test it (I tried with 3 dif types) it took only 0.3V each So, the Mah indicates how long the battery will last? So, I wouldn't have to worry about, per example 5V 3,500mah?
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    Reducing 6.4V 2,700mah for a pda (ext battery)

    Thanks. Sorry, I have found dif informations about this. Serious and reliable sources mention 6V as the maximum. Some users tested 7V with no problems (but there wasn't enough info for me to trust). I don't have the external adaptor (I found it on the web and it reported 5.9V), it is the model...
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    Reducing 6.4V 2,700mah for a pda (ext battery)

    Hi, I'm new here and found a post (in this forum) about using diodes to reduce the current but couldn't understand it quite well as others suggested other ways and putting some capacitors on the system (  ???  ) I have a PDA which uses an external folding keyboard. I use it to write when I...
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