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Old 21st April 2013, 12:42 PM   #191
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
measure the voltage across it (Vds)
measure the current through it (Id).
multiply the results to get the power (Pq).
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 22nd April 2013, 04:59 PM   #192
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I plan to build it. I have not yet built it, so I don't have what to measure.

Last edited by george_ct; 22nd April 2013 at 05:03 PM.
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Old 22nd April 2013, 07:57 PM   #193
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Location: Near Dallas Texas USA
Originally Posted by georgesco View Post
I plan to build it. I have not yet built it, so I don't have what to measure.
Judging from the voltages on the schematic the idle dissipation is under 250mW so a heat sink is not required.
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