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Repaired Harbor Freight digital caliper
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Winston
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Repaired Harbor Freight digital caliper
Bob Engelhardt wrote:
wrote:
...
D1
.--||--+-----+---- (+) to caliper
+ | | |
.------. + | |
| | --- ---
| ---- | --- \ / ~~
| | C1| ---
| ---- | | | LED (red)
| | | |
'------' | |
- | PV | |
'--------+-----+--- (-) to caliper
...
Doncha' need a current limiter on the LED?
Nup. It's a 'shunt regulator'.
http://en.wikipedia.org/wiki/Linear_...ener_regulator
--Winston
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