Author Topic: Help with component maths  (Read 372 times)


  • Diode Destroyer
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Help with component maths
« on: July 30, 2020, 04:19:13 AM »
Hello everyone.

I am looking to use this chip as a DC-DC boost to take my battery voltage to around 9V to use in some of my pedal projects but its been a while since my highschool electronics classes (I'm 40 in 3 weeks :) )

The maths to get to Vout is:

Vout = 1.23V*(1+r1/R2)

Which should be simple enough but the "1.23V" is confusing me. I would have that that means 1.23*V but if thats the case I dont know what V is, and why would it use the * on the next multiplacation.

If would be great if one of you clever people could help

Thanks in advace.



  • Electron Doctor
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  • Jon P
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Re: Help with component maths
« Reply #1 on: July 30, 2020, 08:09:59 AM »
V is volts. It's a unit.

Nothing cancels it, which is why you get volts on the left hand side.
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