So we need a resistor that is small enough to limit the current to 2.67 mA. And then you divide the 200 mA by 100 and that is 2 mA. So you take your load which is 200 mA max. The port that drives the basis is from an ESP device so this is 3.3V when the port is high. The voltage drop on base to emitter is always 0.6 to 0.7 V for silicon. For 2N2222A this would be something like 100 at a 200 mA collector current. Here you need to look at the MINIMUM value for the hFE. What is that? A transistor is saturated when the basis current is larger than the collector current divided by the DC current gain (hFE or beta). If find one that has max 0.2 V you should be good. But in practical life expect 0.05 to 1 V. In the ideal world this is 0 assuming that the transistor is saturated. The voltage is the voltage over the collector to emitter. This you need to calculate using the formular Power = Voltage x Current.
The Max Power Dissipation must be larger than the power that will be burned in the transistor. The max collector current must be larger than your load current. Just more than 5 V with some good margin. The Collector to Emitter voltage must be higher than your max voltage. To drive a load to ground with an NPN transistor you need to pick the transistor on the following data It would be supercool if someone can just tell me if the exchanged Transistor will work with the Diode, and which Resistor i should go for. But i never did it, and seriously, the more i read, the more i’m getting scared I know, this seems to the most basic Stuff. I’m starting with that Sketch, but as i need to exchange the Transistor to the availabe mentioned below, can someone with Experience please help me out with his Knowledge if this will work and be safe, and which Resistor/Diode i should go for? Though i’m a bit frightened, it should be doable, but before ordering all Parts i want to make sure that it basically will work. *This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information.I just started with ESP Devices recently, and now it looks like i have to do my first time soldering I would need just need to turn on/off a +5V Device by a GPIO.
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#Pn2222 transistor bs170 portable
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