Discussion in "Project Help" started by    neo_himura    Sep 2, 2008.
Tue Sep 02 2008, 06:33 AM
referring to the design on http://www.8051projects.net/downloads196.html. I would like to know if i can change the relays with any mosfet or igbt. i cant seem to find a suitable type of mosfet/igbt to control an AC 240V 2kW heater. can anyone help me?
I really appreciate your help. Thanx
Tue Sep 02 2008, 08:29 AM
instead of searching for MOSfets , i would suggest u search for solid state relays which contain the MOSfet and due driving/isolating ckt inside it. Ask for a SSR with an overrated current rating ( as ur load current is around 8~9 A, ask for a rating of about 15~20A). the SSR usually operates on a dc voltage from 3V to 30V.
but they come much costlier than relays.
 neo_himura like this.
Wed Sep 03 2008, 01:57 AM
Hello Neo_himura,

you can make your own SSR with an Optocoupler and Triac, i have made many to control AC loads without use of Relays.

you can use MOC3021 opto and BTA16 Triac, but note that you have to use suitable heatsink for triac (General thumb rule is triac dissipates 1 watt for every 100watt load).

if you can get MOC3041opto it will be still better bcoz it has Zero cross detector.

 neo_himurapdi33nischay kumar and 1 other like this.
Tags zero crossing opto-triaczero crossing detector
Wed Sep 03 2008, 04:49 AM
Thanx for the quick reply. i will try both methods. !dance
Fri Sep 05 2008, 04:34 PM
BTA16, BTB16 and T16 are not available in my place. What other triacs can i replace it with?
Fri Sep 05 2008, 04:46 PM

you can use BTA12, if you can't get that one, you may have to use 2 SCRs - TYN612 connected back to back ( two SCRs will make one Heavy duty Triac !)

All the Best !


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Fri Nov 15 2019, 08:19 AM
Allison Wink
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Sat Oct 12 2019, 10:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 10:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Thank you for your time,
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 04:33 PM
Ismail balghmi
Hello. Please I won't download
Wed Jul 24 2019, 12:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 06:13 PM
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html



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