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Old 25th September 2021, 04:37 PM   #5671
Signal lost is offline Signal lost  United States
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The diyAudio First Watt M2x
Just trying to help, so don't so don't read this if you do not want help.

I experimented with my boards. First checked continuity between the top of R11 and R12. It beeps. Then I installed a 220K resistor for R11 and a 100 for R12. Used my auto-ranging meter and 220 appears on the meter. But there is a little K down in the corner.
so 220K + 100 = 220.K on the meter. Then I repeated the test with a more simple meter. Set to 200 ohms. Shows 1 or over. Same for all the other setting until 2M. Ten it reads 220 with the little K in the corner.

So Craigl59 please verify that you have 221 ohm resistors not 221K ohm resistors. A simple test would be to twist the leads of a 221 and 100 together and then measure the open ends. If 321 does not appear on your meter you have found the problem.

Again I am just trying to help because my next project is the MX2 amp.
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Old 25th September 2021, 05:42 PM   #5672
stonegreen is offline stonegreen  Germany
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The wrong value at R11 also explains the smoke at R13 / R14. Around 30 amps then flow here.
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Old 25th September 2021, 05:46 PM   #5673
slk23 is offline slk23  United States
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Craigl59, if you don't have a component tester I would highly recommend getting one. For example:
https://www.amazon.com/dp/B01MS1FOYM...ing=UTF8&psc=1
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Old 25th September 2021, 05:50 PM   #5674
KevinHeem is offline KevinHeem  United States
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The diyAudio First Watt M2x
Should be popping fuses I would think.
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Old 25th September 2021, 06:06 PM   #5675
stonegreen is offline stonegreen  Germany
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Quote:
Originally Posted by KevinHeem View Post
Should be popping fuses I would think
Mmmh.. about 30 amps at R14 and about 1500 watts on the power supply (with LTSpice).

Last edited by stonegreen; 25th September 2021 at 06:12 PM.
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Old 25th September 2021, 09:00 PM   #5676
rollingtube is offline rollingtube  Germany
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Quote:
Originally Posted by Craigl59 View Post
Folks: Don't pay any more attention to my problems with the boards. Will continue to check out the various short possibilities and report should I find any issues. Thanks as always. Thanks, TA.

Would have helped if you had measured the board first without installing anything. Take it out of the package, and measure what you see across the two R11 pads. If it measures 0Ohms from factory without any soldering iron ever touching it, then we could assume a board problem (or a broken DMM
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Old 26th September 2021, 03:46 PM   #5677
Ryssen is online now Ryssen  Sweden
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The diyAudio First Watt M2x-m2x-fram-jpg

What do you guys think about Austin and Mountain view??
Attached Images
File Type: jpg M2x fram.jpg (303.0 KB, 335 views)
__________________
Regards Åke
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Old 26th September 2021, 03:52 PM   #5678
6L6 is offline 6L6  United States
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The diyAudio First Watt M2x
They are both fantastic!
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Old 26th September 2021, 05:02 PM   #5679
TungstenAudio is offline TungstenAudio  United States
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The Austin and Mtn View are my two favorite front end boards for the M2x. I liked the Austin so much that I adapted it to use as the front end buffer for my F6. Stay tuned, there is another adaptation on the way..
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Old 26th September 2021, 05:04 PM   #5680
RafaPolit is offline RafaPolit  Ecuador
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The diyAudio First Watt M2x
Well, I think there are great lessons to learn from Craig’s adventure:
- double checking values is never a wasted time
- ensuring letters of values on resistors are facing upwards is not just for “aesthetics” (or ensuring color bands all match the same orientation)
- when requesting measurements it would be ideal to post pictures of the ACTUAL moment of measurement
- it helps to keep the basic rules of series and parallel components at hand. 220k in series with 100R would, indeed just show as, basically, 220K.

With a properly oriented resistor and pictures of the DDM, I believe a lot of time and money could have been saved.

The good part is that, after a long drink sitting down and a couple of breathing exercises, you will get furious at the fact that you are just mad at yourself.

When that happens, please come back and thank all the community that spent so much time helping you troubleshoot!

I have bought the $13 part tester that Mark recommends everywhere, and I put every part that goes into the board first into the tester.

It really is a great investment! Worth the price of a burger!

Rafa.
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