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Old 11th July 2012, 04:15 PM   #1641
Salas is offline Salas  Greece
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SSLV1.1 builds & fairy tales
1. Yes for filtering effect. Noise knee 1/F point is defined by the semis physics.
2. I had kills of 25V JXXX JFETs at the base of Vref in high Vo & high cap experiments.
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Old 11th July 2012, 08:24 PM   #1642
schubert is offline schubert  United States
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Quote:
Originally Posted by Salas View Post
First you got to get rid of the cables to the Mosfets. Only local PCB fit. You got wrong shape sinks for easy side or bottom fit I see.
OK I changed them - mosfets are soldered right to the board, but no change - now I get 3.6V instead of 3.7V. Any other ideas?
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Old 11th July 2012, 08:31 PM   #1643
Salas is offline Salas  Greece
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That had to be done, OK. 3.6V spells VGS potential only. See if you got any voltage drop across the outermost trimmer pins.
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Old 11th July 2012, 08:40 PM   #1644
schubert is offline schubert  United States
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That had to be done, OK. 3.6V spells VGS potential only. See if you got any voltage drop across the outermost trimmer pins.
Only 0.189V, which at the current trimmer position gives about the same 0.1mA through the trimmer as I had through R103 before.
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Old 11th July 2012, 08:42 PM   #1645
Salas is offline Salas  Greece
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What happens if you will short the trimmer with a wire for a test?
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Old 11th July 2012, 08:51 PM   #1646
schubert is offline schubert  United States
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What happens if you will short the trimmer with a wire for a test?
Still 3.6V.
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Old 11th July 2012, 09:03 PM   #1647
Salas is offline Salas  Greece
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Is Q304 a BC550? Is it flanked by a couple of 2SK117s?
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Old 11th July 2012, 09:11 PM   #1648
Salas is offline Salas  Greece
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If yes, does Q304 measure ~0.6V Vbe? Is R304 1 Ohm and not 1 kOhm by mistake?
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Old 11th July 2012, 09:12 PM   #1649
schubert is offline schubert  United States
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Yes on both counts for the parts. The "1 ohm" resistors from Teabag's kit measured 1.2 ohms, but I figured they were close enough. I'll check Q304.

Last edited by schubert; 11th July 2012 at 09:14 PM.
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Old 11th July 2012, 09:28 PM   #1650
schubert is offline schubert  United States
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Vbe for Q304 is only 0.026V, which appears to be the difference between Vce and Vbc (both around 4V) - is that correct?
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