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Old 25th April 2005, 10:54 AM   #1
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Default Need help quick please! P101 bias related

Hi all!

I'm just about to test my P101 that I've finished constructing.

Problem us I'm unsure as to whether or I have the bias set to min or max pps:
Rod says to set resistance to minimum on the 20k pot, I have installed it in the same orientation as shown below:

Click the image to open in full size.

Do I turn fully clockwise or anticlockwise as you look at the board in the picture above for min resistance?

Help please, and thanks.
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Old 25th April 2005, 11:09 AM   #2
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Morning!

Use your meter set on ohms to find out which pin is the wiper on the preset, (usually the centre), then with your probes across the two other pins alter the setting until you get minimum resistance.
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Old 25th April 2005, 11:12 AM   #3
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Also where does the '-' from the speaker go to?

Is it P-GND?
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Old 25th April 2005, 11:14 AM   #4
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The speaker ground returns to the star point at your PSU caps.
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Old 25th April 2005, 11:14 AM   #5
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Star ground.
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Old 25th April 2005, 11:14 AM   #6
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Snap!
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Old 25th April 2005, 11:14 AM   #7
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Quote:
Originally posted by pinkmouse
Morning!

Use your meter set on ohms to find out which pin is the wiper on the preset, (usually the centre), then with your probes across the two other pins alter the setting until you get minimum resistance.
Morning to you good sir!

Thanks I'll try that.
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Old 25th April 2005, 11:18 AM   #8
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Quote:
Originally posted by richie00boy
The speaker ground returns to the star point at your PSU caps.
Cheers PM and Rich, what a helpful bunch.

Only problem is I don't have a starground on my PSU, here take a look:

Click the image to open in full size.

Hmm what do I do?
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Old 25th April 2005, 11:42 AM   #9
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One of the 0V tags should do.
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Old 25th April 2005, 12:03 PM   #10
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Quote:
Originally posted by pinkmouse
One of the 0V tags should do.
Choose the one located most central on the trace. Look on the copper side.
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