LM317 tracking pre-regulator and current regulator - Page 3 - diyAudio
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Old 1st October 2012, 09:26 PM   #21
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Four 10mF/25V caps added. B540 replaced with Schottky PBYR1025 in TO220 to save space - a bit hot. Vripple = 0.7mV rms @ 9.2 ohm load

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Old 2nd October 2012, 11:42 AM   #22
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Yet, there is a difference between attached schematic and tested circuit, i.e. values were measured with one LED setting reg2 voltage. Need to add another one.
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Old 2nd October 2012, 04:27 PM   #23
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Output voltage ripple. 2 mV/div @ 10,13V DC and 9,3 ohm load.
C6 has no significant effect on ripple voltage.

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Old 2nd October 2012, 05:51 PM   #24
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Same condition, except rectifiers changed to Schottky 1N5822 (was PBYR1025). Darn!

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Old 2nd October 2012, 06:01 PM   #25
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Same condition, rectifiers are Schottky SB540. See for yourself, I go back to 10A 25V PBYR1025 in TO220.
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Old 2nd October 2012, 06:55 PM   #26
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Back to PBYR1025 Schottky in voltage doubler.
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Old 2nd October 2012, 07:00 PM   #27
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So some more testing: BY229/800.
20mV/div. Just for fun and reference.
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Old 2nd October 2012, 07:24 PM   #28
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Back to PBYR1025. Added 2200uF || C8 (10uF).
Scale: 2mV/div
Enough. Now I can tune output current and connect a tube.
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Old 2nd October 2012, 08:37 PM   #29
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Tube 6C4C filament connected with 2200uF || C8 - oscillations. .5us/div
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2200uF removed. 5 ms/div
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Tube 1. Uf=6.10V so far, so good.
Tube 2. Uf=6.18V
Tube 3. Uf=6.15V

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Old 2nd October 2012, 09:11 PM   #30
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Note 2 LEDs at left - seems they have different specs. Brightness and voltage drop are different, 1.9V and 1.6V.
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