Math was never my strong point lol
Then you need to start coming up to speed on at least basic math, such as algebra, as math is the language of both science and engineering. There's really no way around it.Math was never my strong point lol
So Rb is measured from collector to base?WBahn I disagree with your theory that Vcc should be made from Vbe + Vrb since Rc comes into play somewhere I would think? although I could be wrong....I didn't measure Vrc on my second test but maybe that voltage added to the Vbe and Vrb voltage = the Vcc supply?
I am using a craftsman digital multimeter 82082....love this little meter!
Yes the negative is what I am referring to as ground, I am using a bench power supply, not a battery.
Just as the height difference between two floors of a building can be measured either along the inside of a stairwell, up an elevator shaft, or up the outside of a building, so to can a voltage difference be measured by summing up all the voltage differences along any path between the two points of interest.WBahn I disagree with your theory that Vcc should be made from Vbe + Vrb since Rc comes into play somewhere I would think? although I could be wrong....I didn't measure Vrc on my second test but maybe that voltage added to the Vbe and Vrb voltage = the Vcc supply?
I am using a craftsman digital multimeter 82082....love this little meter!
Yes the negative is what I am referring to as ground, I am using a bench power supply, not a battery.
Then you measured a voltage that has NOTHING to do with the base resistor. You measured Vbc, the base-collector voltage.I used a single meter to take my readings and my base resistor voltage was measured from base of the transistor to the collector.
Double check the value of your resistors. The gain of the transistor is off by about a factor of 10.I used a single meter to take my readings and my base resistor voltage was measured from base of the transistor to the collector.
I am happy with what I achieved however and as far as I am concerned I have some decent numbers to put into a graph and study.
time to move on to transistor characteristic curves me thinks.
Neil.
The base resistor connects the base to the collector.....I measured across the base resistor directly.....from the positive supply to the base of the transistor....look at my circuit.Then you measured a voltage that has NOTHING to do with the base resistor. You measured Vbc, the base-collector voltage.
You need to decide WHAT you want to measure and then you need to set out to actually measure it.
Measuring across the base resistor gets the voltage between the base and VCC, which is proper. Base to collector doesn't get you much of anything of value.The base resistor connects the base to the collector.....I measured across the base resistor directly.....from the positive supply to the base of the transistor....look at my circuit.
The base resistor does NOT connect the base to the collector. Look at your circuit. The base resistor connects the base of the transistor to the Vcc supply rail. The collector is NOT connected to the Vcc supply rail, it is connected to the collector resistor and the other end of the collector resistor is connected to the Vcc supply rail.The base resistor connects the base to the collector.....I measured across the base resistor directly.....from the positive supply to the base of the transistor....look at my circuit.
I stand corrected sir.....my apology.The base resistor does NOT connect the base to the collector. Look at your circuit. The base resistor connects the base of the transistor to the Vcc supply rail. The collector is NOT connected to the Vcc supply rail, it is connected to the collector resistor and the other end of the collector resistor is connected to the Vcc supply rail.
No apology needed. You make mistakes, they get spotted, you make the needed corrections, then you move on having learned something valuable.I stand corrected sir.....my apology.
Petkan:Not really homework although I guess it is as i'm doing this at home lol
I am playing with transistors building really simple circuits and taking measurements so as to get some idea of how tthey function in a circuit, I have a transistor which is fully turned on and I have the expected Base emitter at 0.67v, how can I turn off the transistor slowely whilst taking the voltage reading at this point so I can watch it fall as the transistor turns off please?
Neil.
Petkan:ok I just been staring blankley at this circuit for a while and I can't get my head around why when there is no current flow as in when the transistor is switched off why there would be a voltage across the transistor since no current flow means there cannot be a voltage present?
can someone give me a blow by blow account of what is going on here please?
sorry for being so dumb but this is very interesting to me and I want to understand.
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