0

Log potentiometers were the mainstay for volume controls in radios .I have seen values of 5 to 10K in early solid state radios .Valve radios would use 250K to 1 meg .Crystal cartridge record players would use 1 to 3 meg.Sure these ballpark values reflect the impedance levels .Given that impedance levels can now be easily dealt with by active means there is a choice of resistance values .What log pot resistance values give the best reliability? 10K? 100k ? 1K ?

Autistic
  • 14,616
  • 2
  • 28
  • 65
  • 1
    Probably 100k because there is less likelihood of it overheating on standard/normal/average electric circuits. Other than that MIL-HDBK-217 gives numbers but i didn't remember it saying the value was a factor in reliability. – Andy aka Jun 21 '19 at 11:34
  • I strongly doubt there's any significant difference in reliability, assuming they're used in the same conditions. – Hearth Jun 21 '19 at 13:35
  • For extreme reliability, nothing can be moving. I'd use digital pots, with light-beam interruptions that indicate "less" or "more", the human-hand doing the light-beam interruptions. – analogsystemsrf Jun 21 '19 at 16:29

0 Answers0