24-04-2022, 07:54 AM
It isn't difficult to check the current gain (hfe) of a transistor with a couple of power supplies and meters. Crudely speaking, you vary the base current by a measured amount and see how much the collector current changes.
I'm glossing over the differences between small signal gain and large signal gain but don't think this matters here. At high frequencies, it's almost irrelevant whether hfe is high or low. Any well designed circuit should be able to cope with wide variations in hfe since it's highly variable.
As always, the ultimate test is how well the device works in circuit.
I'm glossing over the differences between small signal gain and large signal gain but don't think this matters here. At high frequencies, it's almost irrelevant whether hfe is high or low. Any well designed circuit should be able to cope with wide variations in hfe since it's highly variable.
As always, the ultimate test is how well the device works in circuit.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
