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oneplustwo F5 build thread
oneplustwo F5 build thread
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Old 1st April 2012, 06:19 PM   #111
Woody1911a1 is offline Woody1911a1  United States
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Originally Posted by 6L6 View Post
They are genuine Bourns pots, yes? Start with them fully CCW

hmmmm doesn't the direction depend on which way you put them in ?
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Old 1st April 2012, 06:24 PM   #112
AudioSan is offline AudioSan  Norway
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yes it does
you want to see 0ohm over R3/R4

Last edited by AudioSan; 1st April 2012 at 06:27 PM.
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Old 1st April 2012, 06:28 PM   #113
6L6 is offline 6L6  United States
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oneplustwo F5 build thread
Well, it only sorta depends on which way they were put in - the PCB does 'key' the pot in a certain direction. And CCW is CCW regardless of which way you look at it, or which way the pot is oriented.

Anyway, as Andrew said, if the light bulb rig glows really bright they are all the way the wrong way, or you have other problems.

You do have a Lightbulb rig, right? If you don't, you need to make a run to the local hardware store before you do anything else.

Click the image to open in full size.
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Old 1st April 2012, 06:36 PM   #114
AudioSan is offline AudioSan  Norway
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ehm. point being that it depends on witch way the pot is, if adjustment gonna be CW or CCW.

Last edited by AudioSan; 1st April 2012 at 06:45 PM.
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Old 1st April 2012, 06:44 PM   #115
Woody1911a1 is offline Woody1911a1  United States
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Originally Posted by 6L6 View Post
Well, it only sorta depends on which way they were put in - the PCB does 'key' the pot in a certain direction. And CCW is CCW regardless of which way you look at it, or which way the pot is oriented.
not trying to make an issue out of this , but the pot can go in either way . the wiper ,pin 2 ,center pin will always go towards pin number 1 ccw and pin 3 cw . if you have the pot in one way ccw will decrease resistance . turn the pot 180 deg and ccw will increase resistance .

that's why you ALWAYS need to check with a meter . NOT by just turning it all the way any one way .

cheers Woody
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Old 1st April 2012, 07:24 PM   #116
oneplustwo is offline oneplustwo  United States
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Quote:
Originally Posted by Woody1911a1 View Post
not trying to make an issue out of this , but the pot can go in either way . the wiper ,pin 2 ,center pin will always go towards pin number 1 ccw and pin 3 cw . if you have the pot in one way ccw will decrease resistance . turn the pot 180 deg and ccw will increase resistance .

that's why you ALWAYS need to check with a meter . NOT by just turning it all the way any one way .

cheers Woody
Exactly. Which brings us back to the issue of why my resistance number increases with time? Takes about 10 seconds till it reads open. If I read voltage for a little while it sort of resets. Weird.

Also, any comments on the psu PCB connection would be appreciated.

Thanks!
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Old 1st April 2012, 08:21 PM   #117
Andersonix is offline Andersonix  Sweden
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oneplustwo F5 build thread
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Originally Posted by oneplustwo View Post
Exactly. Which brings us back to the issue of why my resistance number increases with time? Takes about 10 seconds till it reads open. If I read voltage for a little while it sort of resets. Weird.
Maybe the thermistors (TH1, TH2) are warming up and affecting the R?
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Old 1st April 2012, 10:36 PM   #118
oneplustwo is offline oneplustwo  United States
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Maybe the thermistors (TH1, TH2) are warming up and affecting the R?
Doubt it. They would warm up from what the DMM puts in? Also, shouldnt it just read what's going across the pot?
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Old 1st April 2012, 11:01 PM   #119
Andersonix is offline Andersonix  Sweden
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My suggestion was based on your latest pics which appears to be a completed F5, so measuring across the pot will read everything that's across the meter probes -- which is the entire circuit...
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Old 1st April 2012, 11:19 PM   #120
oneplustwo is offline oneplustwo  United States
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Unfortunately, far from complete!

But you're right, it should measure everything in the completed circuit on the board. But not powered up as of yet.



Quote:
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My suggestion was based on your latest pics which appears to be a completed F5, so measuring across the pot will read everything that's across the meter probes -- which is the entire circuit...
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