Electronics > Repair

Tear down of cheap Amazon decade resistor box

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RNA:
So I thought I would check out these cheap decade resistor box from Amazon £16.
I mean how bad could be?  :palm:

https://youtu.be/8_Qgr17ZWR0

TheMG:
Can't say I'm surprised. The switches are the most important aspect of a decade resistor box in order to yield reliable, repeatable results. Good switches of this kind don't come cheap.

Then again, they could have improved that design quite a bit without significantly adding much cost.

RNA:
What do you reckon about something like these
 https://www.mouser.co.uk/ProductDetail/Grayhill/50P36-01-1-10N?qs=ls7QRyWmRk4Syk7DsxOJAQ%3D%3D
One could make quite a neat compact pcb with six ranges of

100k
10k
1k
100 ohm
10 ohm
1 ohm

trobbins:
Why would you use Grayhill when imho the Alpha's likely suit the rest of the parts?  I don't recall seeing that you determined the nominal accuracy of the step resistors, or considered a max voltage/dissipation rating to suit their tempco and your application expectations.
https://au.mouser.com/datasheet/2/13/taiwanalpha_12112018_SR2612F-1509903.pdf

testpoint1:
if you need the accurate calibration tool, you can find a used "General Radio" kit, made in MA USA, but the factory already closed more than 30 years.

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