An easy to build resistor box.

Thread Starter

Wendy

Joined Mar 24, 2008
23,320
I had an idea how to build a resistive box that won't break the bank,bought 2 packs of 1Ω 5% 5W resistors and 10Ω 5% 5W resistors. The rest will be 1/4W 5% carbon resistors here is the proposed schematic I haven't started building it yet :

Resistor box.png

the smallest increment is 1 ohm the largest is 19 MΩ. When I get to that point I will print a 3D box for it and post it here.
 
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SamR

Joined Mar 19, 2019
4,911
I have a couple of these. I couldn't buy the parts for what they sell them for. Only 1% resistor instead of high precision but good enuff for most of what I do. They use standard dual pin jumpers instead of switches.
1691277692657.png
 

MrChips

Joined Oct 2, 2009
29,832
I have a variety of resistance boxes.

The two I use mostly are this Model 236A from Phipps & Bird,

1691277442025.png

and this variable twin pot I made from two 10k 10-turn pots with digital knob,

Dual pot.jpg
 

Thread Starter

Wendy

Joined Mar 24, 2008
23,320
Why buy when you can build. I use 5 watts for the lower resistances because I was thinking of power supply loads.
 
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Jerry-Hat-Trick

Joined Aug 31, 2022
446
I’m thinking, the cost of switches is typically high compared to the cost of resistors and whilst selecting the right switches in a binary fashion will allow you to select any resistance you want the simplicity of a conventional rotary switch arrangement has a lot going for it
1691310796436.jpeg
 
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