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Results tagged with transistors
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user 36727
A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).
3
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3
answers
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MOSFET to run 12 V, 0.5 A door lock
After searching for a BJT solution, I decided to replace my Darlington pair with a single MOSFET transistor. I have a microcontroller with max I/O pin current of 4 mA at 3.3 V. I have a FQP30N06L MOSF …
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4
votes
2
answers
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NPN transistor to run 12V 0.5A from 3.3v 4mA
I assume this question is very common, because I read a lot of answers here, but I still missing somthing..
I have "Electric Imp" module, which have max I/O pin power output of 4mA, and its run on 3. …
- 343
1
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2
answers
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AVR to drive 12V 1A motor
I never used FET transistors, so I had may some newbie questions (and this is after reading the datasheet for several times and spending hours online reading about FET)
On one of the sites I saw this …
- 343
4
votes
1
answer
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Understanding hFE values in a datasheet to choose a proper BJT base resistor
I already read the post Which resistor for NPN transistor base? But I still cannot understand the base resistor calculation.
I need the transistor to be a switch to 5V 200mA relay. The base will get …
- 343
0
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2
answers
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Transistor to run relay
In addition to my last post I have more information and details.
I want to run 240V Relay (5V Coil) from my AVR chip (ATmega328P).
My EMR relay takes up to 200mA on it peak.
I have 2N2222 transis …
- 343
1
vote
1
answer
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Choosing a transistor to Relay
I am building new project, which I will power up the water tank heater from my smartphone.
I have few safety though I want to ask here to get your opinion.
I am going to use AVR to run a relay, that …
- 343