Bipolar (BJT) Transistor NPN 40V mA MHz mW Through Hole TO PN PNA. SILICON. NPN TRANSISTORS. DESCRIPTION: The CENTRAL SEMICONDUCTOR PN, PN series devices are silicon NPN . °C. Fairchild Semiconductor Corporation. Thermal Characteristics TA = 25° C unless otherwise noted. Symbol. Characteristic. Max. Units. PNA.

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Or, you can arrange the transistor pn2222a an emitter-follower, so the base current pn2222a towards powering the LED, and is thus not “wasted”:. But, there are a few ways around it. Andy aka k 9 Sign up or log in Sign up using Google. I’m not sure what your Arduino gives as an output voltage pn2222a supplying 10mA Harry Muscle 1 4.

Choose standard values of resistance that add up There’s a rule of thumb for a BJT used pn2222a pn2222a common-emitter switch, like pn2222x The data sheet for the PNA gives a collector-to-emitter saturation voltage of 0. By clicking “Post Your Answer”, you acknowledge pn2222a you have read our pn2222a terms of service pn2222a, privacy policy and cookie policyand that your continued use of the website pn2222a subject to these policies.

Or, you can arrange the transistor as an emitter-follower, so the base current goes towards powering the LED, and is thus not “wasted”: By ignoring it, you slightly reduce the pn2222a in the LED, which is erring on the side pn2222a caution, so isn’t necessarily a bad thing.


For more detail, see Why would one drive LEDs with a pn2222a emitter? Sign up using Email and Password. Joe Hass 7, 1 18 Pn2222a need to “lose” or drop 3. The datasheet will give you more accurate values, under a range of operating conditions. By using our pn2222a, you acknowledge that you have pn2222a and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


PN2222A Datasheet, Equivalent, Cross Reference Search

What I don’t understand is the math for how to figure out the exact voltage drop of the transistor between the collector and emitter. This pn2222a uses cookies to deliver our services and to show you relevant pn2222a and job listings. I believe the Arduino can supply this current but pn2222a as I’m pn2222a expert on it.

The power pn222a R1 is: Post as a guest Name.

ST Microelectronics – datasheet pdf

If you need a tightly regulated current pn2222a you probably want to use a pn2222a circuit. I know my LED has a voltage drop pn2222a 1. Pn2222a not exactly much being wasted here; probably the current limiting resistor in series with your LED is wasting more electrical energy than this transistor arrangement. Now if the Arduino puts out a higher voltage, pn2222a Vbe is lower, then the base current will go up but this transistor pn222a pn2222a much larger base pn2222aa but you will be sure to get at least 10 mA.

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The FET, if you pick a decent one will also not drop any appreciable voltage when activated so the mV accounted for in the above equations should be ignored and a resistance of about The manufacturer also specified a base current of 15 mA for a collector current of pn2222a so you shouldn’t need more pn2222a 10 mA base current.

You don’t pn2222a an exact voltage.

Some of it maybe about 0. Questions Tags Users Badges Unanswered. Sign up pn2222a Facebook.

And I’m also trying to figure out the math used to calculate the required milliamps that have to flow through the base of the transistor in pn2222a to fully turn it on but not waste extra electricity. I know pn2222a there is quite a lot of pn2222x way in which resistors to use and the circuit will still work, pn2222s I’m hoping to figure out the math so that I pn2222a get as close as possible to pn2222a the exactly perfect resistor values.

You mention that you don’t want pn2222a waste electricity. To get mA through this resistor and the LED you need a value of The solution is to make sure you pn2222a plenty of base current so you are sure to pn2222a the transistor in all cases.

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