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The BC is a general-purpose NPN bipolar junction transistor commonly used in European and American electronic equipment. It is notably often the first type. Features: • NPN general purpose transistors, especially suited for use in driver stages of audio amplifiers, low noise input stages of tape recorders, HI-FI. A BC transistor is a negative-positive-negative (NPN) transistor that is used for many purposes. Together with other electronic components, such as resistors, .

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BC Transistor: Pinout, Diagrams, Equivalents & Datasheet

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The siren needs 12V and consumes about mA. The Arduino output pin is 5V and can source 40mA maximum.

I would like to use a transistor to switch the siren on and off. Is this an OK application for a transistor?

I’d rather not transitor to use a relay or a SSR because I don’t have any on hand. I’m using Amps, Volts, and Ohms as units. I have found various calculations to determine what kind of transistor I need and I’m not quite sure which is the best one. One of them is like this:. This is where I get a little confused.

Transistor BC547

I have a few transistors and their datasheets but I’m not quite sure how to read them. I have read many resources and I am just as confused now as before. Do the same calculations apply?


I understand that the circuit changes, active high instead of active low, but are there any drawbacks to PNP over NPN? How would I go about choosing the right transistor for the job? I don’t want to overload the transistor.

When choosing the right transistor for this job, first I’ll eliminate the PNP transistors. They’re a bit more complicated to use in your case. As you said, for a PNP transistor, active high becomes active low, meaning the transistor will switch on when you apply 0V from your Arduino, but it won’t switch off when you apply 5V from the Arduino.

From the remaining 3 transistors, I’d choose the one that can handle the most current, just to be on the safe side. That would be the BC darlingtonwhich can handle a maximum of 1.

Only now you’ll have to worry about the gain of the BC If you chose to drive the base of the transistor with a 1KOhm resistor, you’ll have a 3. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. Choosing the right transistor for a switching circuit Ask Question. I want to control a siren speaker has a built-in driver with an Arduino. One of them is like this: Ricardo 4, 14 37 Probably a little late to matter, but there you go.


So the winner would be the BC Alin 7, 13 51 Ok that explains my question very well, thank you. I guess it’s better to have a much higher hFE than a marginal one and to err on the safe side of current load rather than cut it too close. I think I will need to explore this further and potentially look into PNP transistors despite what you mentioned. My siren actually has two positive leads, one for a steady sound and another for “yelp” sound.

They share a common ground.

Would this transisfor that I need the PNP configuration to be able to switch both positive leads? Do you trransistor a datasheet of your siren? Alin Mar 31 ’12 at Alin I proposed an edit but in trahsistor it’s rejected CupawnTae Of course, you’re right. Thank you for the edit: Alin May 11 ’15 at The BC’s datasheet uses a saturation mode beta of i.

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