The Ultimate 12vdc power supply reviews

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leolaushman asked What size resistor for a simple circuit do I need?

I have a 12vdc power supply powering a 12vdc bulb and I would like to maximize the bulbs life by adding a resistor yet still keep it bright enough to visibly see. I purchased a 270 ohm, 1/2 watt, 5% tolerance package of 5 resistors just in the hopes of getting close to right but I don't really know for sure anything about resistors. Can you help? The resistors are returnable if they are the wrong size.

And got the following answer:

Without knowing the current rating of the bulb it is really hard to call. 1resistor will give you 40 ma of current which is pretty low. I would suggest that you check on the current rating of the bulb because most places won't want an open pack of resistors back. The trick with a parallel circuit with multiple identical resistors is that each will supply the same amount of current so the for each resistor you parallel you will get 40 ma. So start with one resistor and add, one at a time until the lamp is bright enough. If you are wondering, parallel means that the resistors a side by side hooked to each other. The battery goes to one end of the bundle and the lamp goes to the other end.


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Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-300R8A - Condition: New - Packaging: Retail


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Dynapower TC-650RVN2 650W ROHS Dual AC Inlet EPS 12V Redundant Power Supply

Dynapower TC-650RVN2 650W ROHS Dual AC Inlet EPS 12V Redundant Power Supply

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Dynapower TC-1U40-TH 1U 400W ROHS w/ Thermal Control EPS 12V Short Depth Power Supply

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Dynapower TC-2U40-TH 2U 400W ROHS with Thermal Control EPS 12V Short Depth Power Supply

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Dynapower TC-2U35-TH 2U 350W ROHS with Thermal Control EPS 12V Short Depth Power Supply

Dynapower TC-2U35-TH 2U 350W ROHS with Thermal Control EPS 12V Short Depth Power Supply

Dynapower TC-2U35-TH 2U 350W ROHS with Thermal Control EPS 12V Short Depth Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-2U35-TH - Condition: New - Packaging: Retail


Dynapower TC-1U35-TH 1U 350W ROHS w/ Thermal Control EPS 12V Short Depth Power Supply

Dynapower TC-1U35-TH 1U 350W ROHS w/ Thermal Control EPS 12V Short Depth Power Supply

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Dynapower TC-400R2U 2U 400W Active PFC ROHS EPS 12V Redundant Power Supply

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Dynapower TC-400R2U 2U 400W Active PFC ROHS EPS 12V Redundant Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-400R2U - Condition: New - Packaging: Retail


Dynapower TC-500R8A 500W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

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Dynapower TC-400R8A 400W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

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Dynapower TC-400R8 400W ROHS Single AC Inlet EPS 12V Mini Redundant Power Supply

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Dynapower SS-2U60EL 2U 600W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

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SPI R-FSP1000-50TGM 10000W ATX EPS 24PIN 13CM BB FAN APFC 10*SATA PCI-E 80Plus Power Supply

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XIGMATEK NRP-HC1001 1000w ATX 12v v2.2 / eps 12v v2.92 80 plus & sli ready modularized w/ active pfc power supply

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XIGMATEK NRP-HC1001 1000w ATX 12v v2.2 / eps 12v v2.92 80 plus & sli ready modularized w/ active pfc power supply - Manufacturer: Xigmatek - Mfg Part Number: NRP-HC1001 - Condition: New - Packaging: Retail


Dynapower SS-1U60EL 1U 600W Active PFC EPS 12V Short Depth 80Plus Bronze Certified Server Power Supply

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Dynapower SS-2U50ES 2U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

Dynapower SS-2U50ES 2U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

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Dynapower SS-1U52ES 1U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

Dynapower SS-1U52ES 1U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

Dynapower SS-1U52ES 1U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply - Manufacturer: Dynapower - Mfg Part Number: SS-1U52ES - Condition: New - Packaging: Retail


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