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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
I have a couple of "sealed" devices that apparently have negative temp coefficient devices inside of them that are placed between a power outlet and the lights. The lights start out at 1/3 normal brightness and come up to full level in 5-10 seconds. Soft turn-on means less light failures. I would like to have/make several of these, but I don't know what is inside the boxes and don't really feel like tearing them apart if I don't have to.
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#2
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Need Negative Temp Coefficient Component for Xmas Lights SlowTurn-on
On 12/09/2014, 2:10 PM, wrote:
I have a couple of "sealed" devices that apparently have negative temp coefficient devices inside of them that are placed between a power outlet and the lights. The lights start out at 1/3 normal brightness and come up to full level in 5-10 seconds. Soft turn-on means less light failures. I would like to have/make several of these, but I don't know what is inside the boxes and don't really feel like tearing them apart if I don't have to. Suggestions! Research Thermistors. John :-#)# -- (Please post followups or tech inquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#3
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
I was being lazy, had hoped for some part numbers g.
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#4
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
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#5
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
wrote:
I have a couple of "sealed" devices that apparently have negative temp coefficient devices inside of them that are placed between a power outlet and the lights. The lights start out at 1/3 normal brightness and come up to full level in 5-10 seconds. Soft turn-on means less light failures. I would like to have/make several of these, but I don't know what is inside the boxes and don't really feel like tearing them apart if I don't have to. ** The devices are probably "NTC thermistors". http://www.ampron.com/UploadFiles/Ot...0338_50489.jpg They come in a range of sizes and resistance values. You need to measure the cold resistance value to establish the latter. Last time I needed some, I found them on Ebay from dealers in HK. .... Phil |
#6
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
Thanks for the info, I'll measure the cold resistance tomorrow, right now the lights are all on.
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#7
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Need Negative Temp Coefficient Component for Xmas Lights Slow Turn-on
Is this what you want?
http://www.ermag.com/index.cfm?v_lin...tail&v_key=325 http://www.ermag.com/index.cfm?v_lin...tail&v_key=326 If you Google "inrush currebnnt limiter", you can also buy the key component form Digikey or Mouser for less than $5. |
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