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Started My Transistor Tester
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Old 12th November 2017, 01:45 AM   #11
MadInventor is offline MadInventor  United States
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Quote:
Originally Posted by nigelwright7557 View Post
Its hard to get all the functionality into one system.
That is one reason why I'm looking at a higher current version for power devices.

MI
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Old 12th November 2017, 05:31 AM   #12
anatech is offline anatech  Canada
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Started My Transistor Tester
The problem with high current is that you generate heat everywhere. Connections become very important and voltage drops generated by the high current are big sources of error. This is true even if the test is a pulse type (except heat is less of an issue).

-Chris
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Old 12th November 2017, 10:04 PM   #13
MadInventor is offline MadInventor  United States
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Originally Posted by anatech View Post
The problem with high current is that you generate heat everywhere. Connections become very important and voltage drops generated by the high current are big sources of error. This is true even if the test is a pulse type (except heat is less of an issue).

-Chris
Chris,

Like they say in the movies, I got to try. Found a 300 mA buffer for drive and a high voltage opamp. Probably will not use DMosfet current limiting, resistor plus fuse instead. Will tailor for 2-2.5 A max. .25 A/V current sense. Have an idea about mounting heatsink with TO-3 and terminal block for TO-3P-247 on top of pcb and configure with jumpers instead of switches.

MI
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Old 13th November 2017, 12:37 AM   #14
anatech is offline anatech  Canada
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Hi MI,
That is more than fair enough. At least you are moving ahead with these thoughts in mind.

-Chris
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