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audioguru said:I use Microsoft Paint program for schematics.
There is free drawing software available.mybuickskill6979 said:nope no drawing programs other then a cad type deal called sketchup but its more 3d type drawing!!
i'm looking at the sheet and the drawing(the first one from len. to see how the math works !
Just look at the graph of its current gain in the datasheet.mybuickskill6979 said:whats the mathematics to from .250v @100mA With a Ib of 5mA, and a Vce of 90mV@10mA with a IB= .5mA
You cannot feed 4A to the base without blowing it up. You probably mean 4ma which is 1000 times less.to a Ib of 4A and a VCE of 80mV @40mA i know where the 40mA comes from but how about the 80mV?
Vce in the active region is the sum of voltage across the resistor (which = Ic * R1) and the voltage across the LED (assumed to be 3.6 V @ 40 mA) subtracted from the supply voltage, ie. Vcc - Vled - Ic * R1.mybuickskill6979 said:okay i have a question about the mathematics.
the VCE Grows or decays in relation to the current supplied to it right? and Ib is very much decided by the VCE and ICE correct? i'm looking at the first drawing by len and the sheet for bc547b!
This is Vce sat at a collector current of 10 mA and a base current of 0.5 mA (not 5 mA). A typical transistor will have a Vce sat of 90 mV under these conditions. But the worst case will have a Vce sat of 250 mV.mybuickskill6979 said:whats the mathematics to from .250v @100mA With a Ib of 5mA, and a Vce of 90mV@10mA with a IB= .5mA
As Audio said, you mean 4 mA, not 4A.mybuickskill6979 said:to a Ib of 4A and a VCE of 80mV @40mA i know where the 40mA comes from but how about the 80mV?
Current gain is called either Beta or hFE.mybuickskill6979 said:okay how does the current gain work? is it max current through collect plus max current through the base? thats been confusing me for a minute!!