BC Rev. A BC NPN Darlington Transistor. • This device is designed for applications requiring . This datasheet contains the design specifications for. BC 2. Motorola Small–Signal Transistors, FETs and Diodes Device Data. ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted). BC datasheet, BC pdf, BC data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, NPN Darlington Transistor.

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Don’t try to switch the 12V, switch the GND and you are all set.

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I use supply with internal control voltage I think, so the first image. If its isolated and it provides its own power, you can very simply use an NPN to switch it. Project Would someone be interested why, I’m trying to control the solar panels at home to get them always at an optimal angle. Base resistor I calculated the 4K7 value with help from this post and otherswhich led me to believe that with a 5K resistor I’d get a base current of 1mA, which with a gain of I checked the datasheet on this would mean it would be able to saturate collector currents above mA, which is fine here.


Hi, This is what you are looking for.

Actual result Unfortunately the motor always starts when I connect the transistor, even if the base is connected to the Arduino ground. NEW Library to make fading leds a piece of cake https: So 20 indeed is a positive supply voltage pin, as it’s labeled Vcc. If it doesn’t provide its own power you have to provide at least 12V externally and high-side switch it.

MarkT Brattain Member Posts: Expected result There should flow current to the controller enable when the Arduino puts 5V on the transistor, and not so otherwise. Everything runs on smoke, let the smoke out, it stops running Now looking at the second picture, and there I can switch the connection to ground. PHPirates on Jul 13, TomGeorge Design and Repair of industrial control systems.

BC – BC NPN General Purpose Transistor

Possible problem points I thought about: Is it opto isolated? Q1 is PNP transistor Tom Is that the way to go?

The circuits look similar, although they use an extra diode because of the dc motor and the motor is on the other side of the transistor, which I think shouldn’t matter.

But now the motor doesn’t do anything MarkT on Jul 13, Transistor The first time I connected the transistor without the datashret resistor, xatasheet I don’t think I’ve blown it but who knows Android app included, hooray for ethernet shields.


Oh, hang on a second. When the Arduino pin is low, I measure around 14 volts across both transistors, which is fine.

You’ll have to find out whether the digital section is opto-isolated with a multimeter.

Thanks Tom, nice find, only one page further Where is the datasheet for this drive? I just bought some PNP transistors and made a high side switch now, using a circuit for example from Stackexchange. Circuit Of course I’ve googled around a lot, and found a lot of examples to control a dc motor with a transistor like this.

Test code I’m sure there’s nothing wrong with that because I tested the output with a multimeter, 4. We also replaced the transistor just in case it was broken, and tested some other crucial connections, although not all.

BC517 – BC517 NPN Darlington Transistor

So I’d need to figure out a 14V power supply Sorry for the bumping, but I just measured some things. Use fricking code tags!!!! So since I want to switch the ground, I need to intercept the connection somewhere right?