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How do you measure bias with no source resistors?
How do you measure bias with no source resistors?
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Old 14th November 2019, 09:56 PM   #21
damuffin is offline damuffin  Canada
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If your really lazy and In a fiddling mood you can use a laser temperature gauge on your big heat sink. I don’t recommend this method for first time bias, but if you think it’s a little hot or a little cold this is by far the easiest.
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Old 14th November 2019, 10:15 PM   #22
Mark Johnson is offline Mark Johnson  United States
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How do you measure bias with no source resistors?
FLIR camera is even easier, and it gives you a softcopy record (photograph) of the reading.
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Old 14th November 2019, 10:15 PM   #23
wrenchone is offline wrenchone  United States
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A while ago, I nabbed a Fluke Y8100 clamp-on DC current probe on E-pray. This is what we used at my last job for power supply current measurements without breaking the line to insert an ammeter. It plugs into your standard DVM and outputs a voltage that is a function of current.
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Old 15th November 2019, 12:55 AM   #24
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by GKTAUDIO View Post
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one resistor is fine; don't need two.
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Old 15th November 2019, 01:11 AM   #25
GKTAUDIO is offline GKTAUDIO  United States
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Perfect, thank you. I suspected that after posting the image, figuring placement might depend on enhancement vs. depletion mode FETs (d vs. s).
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