Golborne Swapmeet 7th April

[ppppenguin]

Another useful tutorial. This is possibly for next time but is something that needs to be known by people very early on when working with bipolar transistors. It's that current gain (beta or hfe) is a horribly unreliable quantity that isn't very useful in circuit design. It just needs to be sufficient. The parameter that's consistent and easy to work with is transconductance: a BJT is really a voltage operated device that happens to need some current input too.