Comment on Virgin Physicists
Venus_Ziegenfalle@piefed.social 3 weeks ago
The humble potentiometer:
The least reliable resistor. Not to mention the trial-and-error getting it close enough to the target value.
linear potentiometer 100% pain, but Multi meter and rotary or digital potentiometer could be simple enough.
Nope, same problem as linear. Can you get angle correct to 4 decimal places and prevent the contact from oxidation?
“Digital potentiometers” are rotary encoders, which are switches, not resistive dividers.
Another option is a multi-pole rotary switch with selectable resistors in each position, but that only gives you the available values.
They are all larger and more expensive. Just use two E12 resistors in parallel or series, you can always get within 1 %. They cost a dime a dozen.
Good info. Cheers mate!
ChaoticNeutralCzech@feddit.org 3 weeks ago
The least reliable resistor. Not to mention the trial-and-error getting it close enough to the target value.
Spacehooks@reddthat.com 3 weeks ago
linear potentiometer 100% pain, but Multi meter and rotary or digital potentiometer could be simple enough.
ChaoticNeutralCzech@feddit.org 3 weeks ago
Nope, same problem as linear. Can you get angle correct to 4 decimal places and prevent the contact from oxidation?
“Digital potentiometers” are rotary encoders, which are switches, not resistive dividers.
Another option is a multi-pole rotary switch with selectable resistors in each position, but that only gives you the available values.
They are all larger and more expensive. Just use two E12 resistors in parallel or series, you can always get within 1 %. They cost a dime a dozen.
Spacehooks@reddthat.com 3 weeks ago
Good info. Cheers mate!