Help with choosing resistors

[Johadart]

Hi, I don’t have a 240 ohm resistor, I’m building a power supply, didn’t come with the kit, any suggestions on what to use in place please?

[connectTek]

A 240 ohm resistor of course, a couple of cents.

[magic]

Either that or a different resistor or a pair of resistors

What are the tolerance and power rating specs of the part you want to replace?
For example, 220+22 is 242, which is less than 1% off. 220 alone is 10% off.
In a pair, the 220 will carry most of the load, so its power spec should match the original part.

[JohanH]

The easiest is soldering two resistors in parallel. Use this calculator to calculate parallel and series resistances. You can set it to output values based on resistor series you have.

https://www.qsl.net/in3otd/parallr.html

For 240 ohm in total, select for instance (based on which resistors you have) 270 in parallel with 2200, which makes it more or less exactly 240 ohm.

[Johadart]

Thanks everyone for your answers 🤙🏼

[gbaddeley]

Or two 120 ohms in series. Perfect power sharing.

[themadhippy]

, I don’t have a 240 ohm resistor, I’m building a power supply,

sounds suspiciously like it could be based around something like a lm317? is so  you can change the 240 ohm to something else and recalculate the other resistor

[JohanH]

sounds suspiciously like it could be based around something like a lm317? is so  you can change the 240 ohm to something else and recalculate the other resistor

There are online calculators for that, too! https://circuitdigest.com/calculators/lm317-resistor-voltage-calculator

[Johadart]

Thanks for all your help, got it done. Cheers 🤙🏼🇦🇺

[Terry Bites]

I think themadhippy is right on the money here. If its for a regulator feedback divider just use 180 to 330 and recalculate. www.omnicalculator.com/other/lm317
If it doesn't carry more than few mA any series or parallel combo will do. 2 470s in II will give you 235. Good enough?