Ok found the DRO deal, now one thing I would like to change if possible. The scales and a display unit all take 1.5 v batteries. Is it possible to take a pc power supply(which I know has 5v and 12v) and reduce the voltage to 1.5v? If yes , how?
Thread: 5 volts to 1.5 volts?
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08-17-2006, 06:40 AM #1
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5 volts to 1.5 volts?
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08-17-2006, 09:16 AM #2
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I would use a voltage regulator chip (LM117 or LM317). If you do not need adjustment, use 280 ohm for R2.
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08-17-2006, 10:50 AM #3
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In the previous example, there will be less heat dissipated if you use a 5v power supply.
BTW, is it 1.5V "batteries" in PARALLEL or SERIES????.
2 in series give 3 volts and the above circuit will need to be reworked.
Simply leave in the variable resistor and dial in the voltage (1.5 or 3.0v) that you need.
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08-17-2006, 11:22 PM #4
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Assuming this is powering calipers, where are you putting the LM317?
Suspect since they are designed to run on batts they have low noise immunity on the power rail , suggest a few uf paralle with a 0.1uf at the caliper end.maybe...
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08-18-2006, 01:21 AM #5
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Its just the cheaper digital scales , I believe they use just one battery. I just hate batteries and would rather have it powered by a power supply.
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08-18-2006, 11:18 AM #6
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Why not use a Duracell AA battery (or larger) - will last for YEARS !
Phil.
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