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Old 11th March 2014, 04:43 PM   #3951
6L6 is offline 6L6  United States
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Use two closely matched pair, BUT put one pair in the "upper" position of each channel, (signal device) and the other pair in the "lower" (current source) position.
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Old 11th March 2014, 04:53 PM   #3952
cwtim01 is offline cwtim01  Hong Kong
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Thanks 6L6 for the answer. Just to be sure I understand properly, do you mean it would be something like:

Left channel: signal - 15.90, ccs - 15.81
Right channel: signal - 15.91, ccs - 15.81
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Old 11th March 2014, 04:58 PM   #3953
6L6 is offline 6L6  United States
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Yes.
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Old 11th March 2014, 05:00 PM   #3954
cwtim01 is offline cwtim01  Hong Kong
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Got it, thanks
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Old 11th March 2014, 09:51 PM   #3955
Salas is offline Salas  Greece
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Watch the dissipation as BF262 chance more like 2SK170V for IDSS.
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Old 12th March 2014, 12:43 AM   #3956
cwtim01 is offline cwtim01  Hong Kong
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Thanks Salas, Andrew mentioned the same before. I'll probably stick a small piece of copper foil on them with thermal glue.

@18 degC room temperature and open space, running them @12V and idss for an hour, they aren't even warm. But it's probably very different in the summer, in a small case together with a shunt regulator.
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Old 12th March 2014, 01:14 AM   #3957
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If they are not even warm then adding 30 degrees of summer heat is only going to make them warm.
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Old 12th March 2014, 08:43 AM   #3958
spiri is offline spiri  Austria
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150mW on a BF862 with 1mm traces and Pads from the resistor nearby heated to 25C above ambient. Should be no problem even in a chassis.
If you have this power in a TO92 it runs hotter.
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Old 12th March 2014, 07:03 PM   #3959
cwtim01 is offline cwtim01  Hong Kong
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Quote:
Originally Posted by KatieandDad View Post
If they are not even warm then adding 30 degrees of summer heat is only going to make them warm.
Quote:
Originally Posted by spiri View Post
150mW on a BF862 with 1mm traces and Pads from the resistor nearby heated to 25C above ambient. Should be no problem even in a chassis.
If you have this power in a TO92 it runs hotter.
Thanks both
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Old 16th March 2014, 09:52 PM   #3960
feds27 is offline feds27  United States
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Default AULT / SL POWER / RESPIRONICS MEDICAL POWER SUPPLY

FYI, the Ault 18V 90W medical power supply model MW116 is now the SL Power MENB1090 also sold as Philips / Respironics 900-150.
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File Type: pdf MW116MA2403F01-Ault.pdf (123.0 KB, 39 views)
File Type: pdf MENB1090_DS.pdf (236.3 KB, 32 views)

Last edited by feds27; 16th March 2014 at 10:03 PM. Reason: Added spec sheets
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