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Old 26th December 2011, 12:52 AM   #2211
Salas is online now Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Great, will be BiB also like LV?
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LV = low voltage BiB regulators GB
You mean you like it in black too I guess.
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Old 26th December 2011, 03:33 AM   #2212
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my SSHV2 in progress (not yet complete)....seems I need a bigger sink on Q3???!!...all suggestion welcome...
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Old 26th December 2011, 03:39 AM   #2213
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IRF840 sink's too small.
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Old 26th December 2011, 03:40 AM   #2214
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same as Q1 OK or not??
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Old 26th December 2011, 03:40 AM   #2215
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Q1 DN2540 has OK sink if you will use ~20V drop Vin-Vout.
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Old 26th December 2011, 03:43 AM   #2216
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you mean IRF840 need a bigger sink than Q1??.....do you think a 20V drop enough for the board to work smoothly...or need a 50V drop better??
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Old 26th December 2011, 03:44 AM   #2217
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20V drop OK. More is just heat. IRF840 surely needs a much bigger sink than Q1. Watch other guys photos.
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Old 26th December 2011, 03:53 AM   #2218
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referring to post 2174...the sink he used on his Q1...is it big enough?? if not I may have to rework the board a bit....
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Old 26th December 2011, 05:07 AM   #2219
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How much current do you need for your application? Add around 30mA to set the current on your regulator. If more than 50mA then I think you will need a little bigger sink on Q1.
I tested until 100mA and Q1 sink was getting warm enough. Not good for long term reliability, especially if inside a box.
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Old 26th December 2011, 05:29 AM   #2220
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I am using only one SSHV2 at the moment to feed both channels...each channel with a CCS (C4S) set at 20mA loading the tube....looking only at these figures = 40mA....not counting heat and other things.... +30mA for the SSHV2....I don't know if I have missed anything else...
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