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Old 14th February 2020, 08:23 PM   #511
Nelson Pass is offline Nelson Pass  United States
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It's in series with a pot that is set at 0 ohms clockwise. You can take the
series resistor to 2.2K easily
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Old 14th February 2020, 08:41 PM   #512
Antoinel is offline Antoinel  United States
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Quote:
Originally Posted by andy20060 View Post
Thank you for the reply.


I think its R13 and R16 but not 100% sure would reducing these to @ 3K give me the extra 0.9V.


Andy
Hello andy20060. I only see R13 [3.32K] in the schematic of the original H2 which has only one LM317.

I suggest that you leave R13 in place and parallel a 6.8K across its leads. The resulting value of the two parallel resistors is 2.23K; as suggested by Mr. Pass. The PCB traces are fine/delicate. I am weary of desoldering and soldering components to the PCB.

Best
Anton
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Old 15th February 2020, 03:02 PM   #513
Antoinel is offline Antoinel  United States
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Hello andy20060.

Please lookup the LM317 datasheet, and find the equation which calculates its output voltage.

The equation says that the sum value of R13 [3.3K] and the adjustment pot [max 1K] must be increased so as to increase Vo.

You have H2 V1 which has twin LM317s. It follows that the above fully applies to the branch of R16 twin [3.32K] and its 1 K pot.

Best
Anton
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Old 15th February 2020, 05:50 PM   #514
Nelson Pass is offline Nelson Pass  United States
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Obviously my error. It looks like a conventional feedback loop, but it's not....
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Old 15th February 2020, 06:56 PM   #515
andy20060 is offline andy20060  United Kingdom
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Hi there,
I changed R13/R16 to 2.6K which i had on hand. The max voltage @T2 went down to 14.2V .

I then added two smaller resistors in series to R13 to bring it up to 4.36K and I did the same to R16. The max volgate @T2 went up to 19V which I was then able to adjust to 17.4V .


Job Done.
Andy
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Old 16th February 2020, 09:58 AM   #516
yoshida is offline yoshida  Japan
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I put the 2019 christmas gift H2 in a small wooden chocolate box.
I am happy with the cute appearance and the scent of cacao.
Of course for sound quality!
Thank you Jim, Nelson, all.
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File Type: jpg H2-02.jpg (980.4 KB, 206 views)
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Old 16th February 2020, 11:38 AM   #517
dewdrop is offline dewdrop  Singapore
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It is so beautiful. One of a kind.
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Old 16th February 2020, 02:46 PM   #518
6L6 is offline 6L6  United States
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Absolutely wonderful! Thank you for sharing the photos!
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Old 16th February 2020, 03:08 PM   #519
Dennis Hui is offline Dennis Hui  Canada
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Beautiful! Also, it must be very special chocolate.
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Old 16th February 2020, 03:10 PM   #520
ItsAllInMyHead is offline ItsAllInMyHead  United States
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Thanks so much for posting the pictures! Gorgeous. Now, I need to get creative and see how I can nab a few boxes that my wife has set aside...
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