No 470k resistor how do I sub?

[kweefthief]

I got a space heater board from @vigilante398 at sushiboxfx! I was so excited to build it but realized I don't have a 470k resistor. I have most other common values. I know you can run resistors together but I'm not sure how and which values to use together. Please help

 

[Locrian99]

Any 2+ resistors whose sum is 470k would be fine. Or you could run two 1M in parallel to get 500k. I would shoot for within 5% since you likely won’t be able to get there with just two unless you have a 390 and an 82

 

[vigilante398]

Yup a pair of 220k in series or a pair of 1M in parallel would get you to the same place.

Alternatively you could swap the other resistor in that voltage divider (that's all the 470k is for) and change both to keep the same ratio. Per the schematic it's a 220k over a 470k, so you could get pretty well the same results with a 100k over a 220k. Just make sure you're swapping the 220k from the voltage divider, not the one from the power supply.

 

[kweefthief]

I did 240k 220k and 10k in series! Couldn't find anything on the internet after a quick scan so I coiled the leads around each other and soldered them! Looks wonky but in theory it should work i think

 

[vigilante398]

I did 240k 220k and 10k in series! Couldn't find anything on the internet after a quick scan so I coiled the leads around each other and soldered them! Looks wonky but in theory it should work i thinkView attachment 37426

Should be fine. As I said the exact value isn't super critical in that position, but that should definitely do it.