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Topic: Which transistors should i use? (Read 2964 times) previous topic - next topic

puelon

Mar 17, 2018, 03:48 am Last Edit: Mar 17, 2018, 04:18 am by puelon
Hey guys, Im doing a project that i need to turn on a mini fan that has 5v and the IC is 0,140A, i need a transistor is able to my arduino port from 20ma to 140ma, but i dont which one i should be looking for.

ted

Hey guys, Im doing a project that i need to turn on a mini fan that has 5
5 of ?

CrossRoads

You're looking to sink 140mA?
IRL540 is good, 0.063 ohm on resistance at Vgs = 4V.
https://www.digikey.com/product-detail/en/infineon-technologies/IRL540NPBF/IRL540NPBF-ND/812000
TO220 package, easy to work with.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

outsider

#3
Mar 17, 2018, 04:04 am Last Edit: Mar 17, 2018, 04:07 am by outsider
Like this?

puelon

#4
Mar 17, 2018, 04:26 am Last Edit: Mar 17, 2018, 04:31 am by puelon
You're looking to sink 140mA?
IRL540 is good, 0.063 ohm on resistance at Vgs = 4V.
https://www.digikey.com/product-detail/en/infineon-technologies/IRL540NPBF/IRL540NPBF-ND/812000
TO220 package, easy to work with.
Thank you for your time to read and help me, im looking to increment the output from the arduino pin that is by default 20ma, to 140ma. I was reading the datasheet it doesnt specify the collector, base and emitter currents. I am very sorry if i understood something wrong. Basically i am trying to do is make a 5v mini-fan work

@outsider i was thinking the same thing, to use a resistor and a NPN 2N2222 like in your schematics, but what would be output current and voltage in your schematics?

CrossRoads

MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

larryd

#6
Mar 17, 2018, 04:45 am Last Edit: Mar 17, 2018, 04:58 am by larryd
FYI
See Q3 circuit.
You replace the relay with your fan.
The 12v would be changed to 5v to match the fan voltage.



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No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
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raschemmel

Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

puelon

MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

Very interesting, i will try it, and will update the topic with the results, thanks for the help once again :)

ted

Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?

When I click the resolutions is worse,very good function concept.

raschemmel

I didn't know there was a "Resolutions" toolbutton.
That's a new one in me, but then I'm so old, everything is new to me. I went out to my car this morning and it looked new to me. All I did was wash it last week and it still looks new. Must be the rain here in California doing that. Beats ice and snow...
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

ted

#11
Mar 17, 2018, 08:42 am Last Edit: Mar 17, 2018, 08:52 am by ted
Ice in California ???
I am north of that 2000 km, almost spring.

raschemmel

High altitude gives me headaches.
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

larryd

#13
Mar 17, 2018, 04:11 pm Last Edit: Mar 17, 2018, 04:55 pm by larryd
Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?
Paul__B make a Macro that you can copy and paste, your URL entered as shown.
Code: [Select]
[center] [url= Your_URL ][img width=500] Your_URL [/img] [/url][/center] [center]
Click on the image for full resolution.[/center]




No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

raschemmel

It looks like a Link embedded in a Link
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

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