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EEVblog #35 – Inside the Varta 15 minute NiMH Battery Charger
Posted on October 3rd, 2009 10 commentsDave cracks open the Varta 15 minute NiMH battery charger, what will he find?
10 responses to “EEVblog #35 – Inside the Varta 15 minute NiMH Battery Charger”

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So where’s pt 2?
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Hi David, I love the eps where you actually open something up and give a brief description, would you mind giving a short description of how diodes can be used to detect temperature?
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Lionel October 15th, 2009 at 01:46
With silicon diodes, Vf changes with temperature in a very predictable way, so they make a great “poor mans” temperature sensors. They’re not so good for measuring absolute temperature, but they’re very reliable for measruing temperature differentials (eg; ambient vs local). Check the data sheet for a 1N4148 or 1N4001 for details.
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eydryan October 9th, 2009 at 06:28
I love your shows, great fun
Esp loved the one with audiophoolery
your stuff is really great, keep making them , first one i saw was about capacitors and it was really interesting.
can’t wait for pt2
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Hi Dave. Well done on the blogs. I especially loved the rant 3:00 minutes into #35 with the Star Trek & Stargate references as did my 17 year old son. More of these humorous bits please

Anyway great job, keep them coming!Jon
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Bought a Varta 15 minute NiMH Battery Charger and got to say maybe I should not have purchased one. The leds are shining in red with the batteries it came with.
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most battery chargers do not have an automatic termincation if the batteries are fully charged already ‘
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“Problems with Varta 15 minute charger”
http://www.flickr.com/groups/strobist/discuss/72157623742663830/
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none October 4th, 2009 at 08:27