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-   -   Need help quick please! P101 bias related (http://www.diyaudio.com/forums/solid-state/56063-need-help-quick-please-p101-bias-related.html)

ShinOBIWAN 25th April 2005 11:54 AM

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 :opps:
Rod says to set resistance to minimum on the 20k pot, I have installed it in the same orientation as shown below:

http://www.sound.westhost.com/p101-pic.jpg

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

Help please, and thanks.

pinkmouse 25th April 2005 12:09 PM

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.

ShinOBIWAN 25th April 2005 12:12 PM

Also where does the '-' from the speaker go to?

Is it P-GND?

richie00boy 25th April 2005 12:14 PM

The speaker ground returns to the star point at your PSU caps.

pinkmouse 25th April 2005 12:14 PM

Star ground.

pinkmouse 25th April 2005 12:14 PM

Snap! :)

ShinOBIWAN 25th April 2005 12:14 PM

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! :D

Thanks I'll try that.

ShinOBIWAN 25th April 2005 12:18 PM

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:

http://www.bmm-electronics.com/image...q/2010r1-3.jpg

Hmm what do I do?

pinkmouse 25th April 2005 12:42 PM

One of the 0V tags should do.

richie00boy 25th April 2005 01:03 PM

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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