LooseCannon wrote:Hey guys,
I'm looking for a way to measure hfe on silicon NPN transistors (I don't have an HFE function on my DMM).
I've searched all over the web but only found ways to measure Germaniums which includes voltage leakage.
I did find this page: http://sound.westhost.com/project31.htm
Will the circuit on figure 1 work? He doesn't state the value of the resistor and what power supply should be used.
LooseCannon wrote:Thanks for the info DrNomis!
So again regarding the figure 1 schematic, what resistor value should I use?
I've seen the schematic for the power supply but there's no way i'm gonna build that for this little tester
Would a 9v battery work as a power supply?
LooseCannon wrote:OK I replaced a fuse in my DMM and now it's ok.
So when testing with a 1M resistor I get a mA reading of 00.15 for a sample transistor, and with a 2.2M resistor I get a reading of 00.39.
So which resistor would give me the right reading?
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