RadioLocman.com Electronics ru
Advanced Search +
  
Go Back   RadioLocman Forum > Electronics and ... > Beginners

Beginners Questions from beginners.

Reply
 
Thread Tools Search this Thread
Old 05-12-2016, 05:56 PM   #1
onklen
Junior Member
 
Join Date: May 2016
Posts: 1
onklen is on a distinguished road
Default Relay or MOSFET for 24V and 2A

I'm working on a small project where I want to use my Raspberry PI to turn on/off a power resistor for temperature control. I'm looking at a maximum of 50W and I have a 24VDC power supply so I will be looking at approximately 2A through the power resistor.
Would this design be best by using a MOSFET to activate a 24VDC relay or would it be fine to simply use a MOSFET that would be rated for 2A and skip out on the relay?
I'm hoping that I can drive it directly from the Raspberry PI so naturally the gate current would need to be kept low as well as the gate voltage as I won't have more than 5V.
Any good advices on a specific MOSFET that might be handy?
onklen is offline   Reply With Quote
Old 06-03-2016, 09:01 AM   #2
DRN_231
Junior Member
 
Join Date: Aug 2015
Posts: 15
DRN_231 is on a distinguished road
Default

A simple N MOSFET will do.
there are thousands.

Look for:
* VDS > 30V (better 40V)
* V_GS_TH < 3V
* R_DS_ON < 50mOhms (At 4.5V V_GS or below)
DRN_231 is offline   Reply With Quote
Old 06-13-2016, 08:41 PM   #3
symbol
Senior Member
 
Join Date: Oct 2013
Posts: 123
symbol is on a distinguished road
Default

If you planned to supply the relay coil with the same voltage already used by logic devices, I agree to prefer an N-Mosfet. Relays in general generate expressive spike on power bus during On/Off switching.
symbol is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SOI MOSFET Radiation at High Frequency ravicoolit Beginners 0 01-20-2016 05:05 PM
Regulating transistor mosfet Jon Beginners 2 08-06-2015 01:56 PM
Discussion: Robot shield for Arduino. Part 1 - Hardware and Schematic Radiolocman Robot Microcontrollers (MCU) 1 05-13-2014 05:17 PM
Construction of schemes for audio and video inputs eletmoraes Projects and Advices 1 11-05-2013 04:04 PM
Discussion: 300 Watt MOSFET Real HI-FI Power Amplifier Radiolocman Robot Projects and Advices 1 03-28-2012 07:55 AM

All times are GMT. The time now is 03:33 PM.




Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Slices ↓
Radiolocman facebook Radiolocman twitter Radiolocman google plus