I'm working on a circuit to monitor battery voltage. In order to test the circuit it seemed wise to add a pot to vary the battery level and this in fact did work for a minute or so. But then it all went dead ....
What happened was the wiper on the pot opened up. At 1st I thought it was just because it was a cheap Chinese pot from the Shack, but now I think yours truly did it in himself because I didn't check the power req.
It "was" a 15 turn PCB mount that's rated .75 watts. My DMM says my circuit is 143 ohms from supply to gnd. 12v/143 and I get 84 mA. 12v times 84 mils gets me just at a watt.
Was it me? LOL! Well, at $2 it was a cheap lesson.
SP
What happened was the wiper on the pot opened up. At 1st I thought it was just because it was a cheap Chinese pot from the Shack, but now I think yours truly did it in himself because I didn't check the power req.
It "was" a 15 turn PCB mount that's rated .75 watts. My DMM says my circuit is 143 ohms from supply to gnd. 12v/143 and I get 84 mA. 12v times 84 mils gets me just at a watt.
Was it me? LOL! Well, at $2 it was a cheap lesson.
SP