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Old 2nd October 2012, 09:38 PM   #31
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what is your voltage drop across the regs? The LM317 performs best with at least 5V in to out difference if you don't have 10V to drop then make the voltage drop on the second one higher, making sure to at least have more than the drop out voltage on the first one (unless of course it doesn't matter in this configuration which I have not tried).

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Old 2nd October 2012, 09:49 PM   #32
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Voltage drop across current reg is 3.5V+1.24V across 1.22 ohm resistor+6.1V across filament equals 12.84V. So there is roughly 6V drop across TPR.
I must use heatsinks with lower C/W, I think. They are quite hot. I can touch it, but not too long. I guess they are about 50-60 C. I will try to measure temperature tomorrow.
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Old 5th October 2012, 08:04 PM   #33
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Old 6th October 2012, 12:36 PM   #34
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Measured or shall I say estimated* temperature of heatsinks of all regs - they are 65 to 75 deg C hot in open air. I guess regs themselves has higher temp. I will measure when the board is inserted into the enclosure.
Schottky diodes are mounted without heatsinks and the temperature is about 40 deg C.
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