| Trim Pots? [message #1465] |
Fri, 28 July 2006 19:12  |
 spaghettiwestern
Messages: 5
Registered: July 2006
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Junior Member |
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I have the 2.3 PCB and on the bottom there is a row of 8 holes all named TP_something and one more in the clean blend section. I'm assuming these are trim pots, but each one only has the one hole, and I can't find any info about it in the wiki (the parts list doesn't mention anything needing to go there) and the only completed board pics I've seen are of the 2.2 PCB which don't seem to have them. I'm building this with all the mods and I was just wondering what, if anything, I needed to do in these spots.
Otherwise the board looks great and I'm almost ready to start the wiring.
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| Re: Trim Pots? [message #1466] |
Mon, 31 July 2006 00:24  |
dann
Messages: 820
Registered: December 2002
Location: Austin TX |
Senior Member |
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T.P. stands for "Test Point"! These correspond to the Test Points on the Tweaking Guide (Tests 1-5 = TP_1 - TP_5). Step 7: Output Test" in the Guide also applies to tweaking pcb v2.3.
Notice there's an extra Test Point: "TP_6_noisevol".
Put the scope on this test point and you should see the waveform go from zero (when Noisevol is at Min) to fully clipping, approx 6-8V p-p (when Noisevol is at Max).
There's also a test point for the LFO: "TP_LFO", which should show a varying triangle wave that goes from fast (50-100Hz?) to slow (0.5 Hz or less) as you turn the LFO Speed knob. Make sure the LFO on/off switch is set to "ON". Also do a visual test to make sure the LFO LED is flashing.
And there's a test point for Low Power "TP_low", which should vary the voltage from 9V to anywhere below 6V as you turn the Low Power knob. It's normal to see oscillations at this test point.
And the final test point is "TP_clean" which should show a clean-ish signal that varies in amplitude from zero (when Clean Volume is at Min) to 2-4V p-p (when Clean is at Max). Really, a better test is using your ears to make sure you can get a good mix between the clean and noise using the Clean Vol and Noisevol controls.
I'm linking this article to the wiki, under the pcb v2.3 heading
Good luck!
Dann
[Updated on: Mon, 31 July 2006 00:33]
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| Re: Trim Pots? [message #1472] |
Mon, 31 July 2006 02:21 |
spaghettiwestern
Messages: 5
Registered: July 2006
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Junior Member |
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Yeah, I thought about it some more and that's what I figured it might be. Thanks for the reply though so I know for sure.
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