I got this broken crate combo a while back, and I gutted everything out of it, so I now just have a chasis. What I want to do is make it kind of my breadboarding and experimenting central, and I just want to have a bunch of different potentiometers for different circuits. Anyways, the chassis now has 10 holes, but I can drill more in it. I'm just wondering what the 10 most commonly used potentiometers are. Thanks!
You can make clip on R's to lower the combined R value
say you might want 224k pot and all ya Gots a 400k...take a resistor [say about 400k] and add clips to each end...clip that on the outer lugs of the pot and this will give combined variable resistance of between Ok and 200k, unclip the added resistor and youre back to between 0k and 400k variable resistance. Then adjust to taste.
I'ts kinda fun to build resistance with different fixed resistors too, recently I've started getting very close to exact values [most of the time closer than that of a single fixed 5% tolerance resistor] combining a couple that are say 2x or half the value I need and paralleling or seriesing them to get close, then I take one 'about' say ~10x the value of the original called for and use that as a 'fine tune' ...good thing about perfing...you can take up board space and use up the resistors that come in long rolls...I've got about ten of these down there about half picked, nice to get it very close to the initial target R value and use up some odd value resistors...
1k, 2k, 5k, 10k, 20k, 50k, 100k, 250k, 500k, 1M.
for tubes, eliminate some smaller values and include 2M and 5M.