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Interior LED conversion.

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Old Nov 17th, 2018, 15:23   #11
SwissXC90
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any ebay link to these resistors please?
Example:
https://www.ebay.co.uk/itm/Carbon-Fi...eLew:rk:2:pf:0
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Old Nov 19th, 2018, 09:47   #12
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Thank you, I have placed some on order from that link.

will update
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Old Nov 19th, 2018, 10:47   #13
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any ebay link to these resistors please?
http://spiratronics.com/0.25w-carbon...istor-4k7.html

There you go, pick your quantity, you get price breaks for 10 or more.
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Old Nov 19th, 2018, 11:52   #14
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http://spiratronics.com/0.25w-carbon...istor-4k7.html

There you go, pick your quantity, you get price breaks for 10 or more.
I ordered some 4.7 from that ebay link, x20 for 99p
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Old Nov 19th, 2018, 11:53   #15
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Do these have to be fitted a certain way round or can they go in any way?
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Old Nov 19th, 2018, 12:41   #16
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I ordered some 4.7 from that ebay link, x20 for 99p
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Do these have to be fitted a certain way round or can they go in any way?
That wasn't actually an ebay link, it's a direct link to the seller so is usually cheaper than buying from their ebay shop.

Resistors aren't polarity conscious, no.

I just hope someone has done their maths correctly because those resistors only add about 3mA into the circuit and an extra 40mW of power - not what a ballast resistor would usually be. A 470 Ohm resistor would add about 30mA of current and about 400mW which might be more like it.

Time will tell!
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Old Nov 19th, 2018, 16:26   #17
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It's not a ballast resistor.
It's there to sink the leakage current which occurs in electronically switched lighting systems when you do not use an incandescent bulb.

So you just need to provide a resistive pull-down path to ground, and it doesn't need to be much.
You could probably get away with 10kOhm

You definitely do NOT want anything like 470 ohm which would start to get warm.

The goal here is to pull-down with the least amount of current possible, and thus the least amount of power dissipation.
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Old Nov 19th, 2018, 17:46   #18
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Quote:
Originally Posted by SwissXC90 View Post
It's not a ballast resistor.
It's there to sink the leakage current which occurs in electronically switched lighting systems when you do not use an incandescent bulb.

So you just need to provide a resistive pull-down path to ground, and it doesn't need to be much.
You could probably get away with 10kOhm

You definitely do NOT want anything like 470 ohm which would start to get warm.

The goal here is to pull-down with the least amount of current possible, and thus the least amount of power dissipation.
Define "ballast resistor" please?
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Old Nov 19th, 2018, 18:23   #19
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Quote:
Originally Posted by SwissXC90 View Post
It's not a ballast resistor.
It's there to sink the leakage current which occurs in electronically switched lighting systems when you do not use an incandescent bulb.

So you just need to provide a resistive pull-down path to ground, and it doesn't need to be much.
You could probably get away with 10kOhm

You definitely do NOT want anything like 470 ohm which would start to get warm.

The goal here is to pull-down with the least amount of current possible, and thus the least amount of power dissipation.
Guys, so I have orders 4.75k resistor.

Is this the correct resistor???
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Old Nov 19th, 2018, 21:03   #20
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Guys, so I have orders 4.75k resistor.

Is this the correct resistor???
Yes it will be fine. Anything from 4k to 10k will be fine.
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