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Topic: A couple of questions on the 2N2222 transistor (Read 6 times) previous topic - next topic

charis

Thank you all! Just for reference, i eventually used 10kOhm in the base and 100 ohm as a current limiting resistor, for ~100 ?? base current and ~11 mA through the LED :



https://www.circuitlab.com/circuit/gmmqaq/2n2222-led/

Papa G

I'm curious why OP chose to switch the high side instead of using the original circuit. With this setup, the transistor is operating in the linear region and will never reach saturation.

CrossRoads

Yeah, but with that freaking fritzing program you can't tell that - have to go look up the parts and see which pins are B, E, C - which was totally obviouse in the original post.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Papa G


Yeah, but with that freaking fritzing program you can't tell that - have to go look up the parts and see which pins are B, E, C - which was totally obviouse in the original post.


The link goes to a CircuitLab page that makes it easier to evaluate.

retrolefty


Yeah, but with that freaking fritzing program you can't tell that - have to go look up the parts and see which pins are B, E, C - which was totally obviouse in the original post.


Hey Bob, why are you not out shoveling snow off your drive way.  ;)

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