MOC 3023M - Page 1
Forum section: electronics / beginners

author: ASHU
author_rank: Contributor
timestamp: July 11, 2015, 04:24:01 pm
content: Can I directly provide 240Vac to MOC 3023M or should I use a resistor before that?also will a Zero crossing optocoupler like MOC 3042M work on the same voltage?I have read the datasheets but I don't understand every part of it (Still learning)Thanks in advance.Datasheets:MOC 3023M :http://www.farnell.com/datasheets/1806097.pdfMOC 3042M :http://www.farnell.com/datasheets/1639837.pdfSorry for creating a New Poll at the first place but I have no clue why the new topic link wasn't opening up.(Guess something was wrong on my end only)

author: mauroh
author_rank: Frequent Contributor
timestamp: July 11, 2015, 07:40:27 pm
content: If you look at pag 6 and 7 of the DS you provided, you will find the application circuit.Follow that an you will be okBoth devices can handle 250/400 V peak and the resistor will limit the current.Mauro

author: mauroh
author_rank: Frequent Contributor
timestamp: July 11, 2015, 07:51:00 pm
content: Just to be safe, do you want apply the 240Vac to the optotriac side or to the led side?What you want obtain exactly?Mauro

author: ASHU
author_rank: Contributor
timestamp: July 11, 2015, 08:07:12 pm
content: I only want to make an electricity sensor kind of thing with load connected in parallel.If their is electricity flowing through the wire then then IC should detect it.I'am using it after a switch, i.e if the switch is ON, then MOC3023 should send a signal to my micro-controllerSo will this work? plus are resistors necessary if I'am connecting it in parallel?

author: mauroh
author_rank: Frequent Contributor
timestamp: July 11, 2015, 08:48:08 pm
content: What about this?Of course you need resistors, the poor led will handle only 1.5V.This circuit will give you a LOW lever if the main is present.Mauro

author: ASHU
author_rank: Contributor
timestamp: July 11, 2015, 09:32:47 pm
content: Hmmm thanks 😄Will try it out

author: rs20
author_rank: Super Contributor
timestamp: July 11, 2015, 09:50:56 pm
content: Quote from: mauroh on July 11, 2015, 08:48:08 pmSo that won't work with an optotriac like the MOC3023 because the optotriac would never de-latch, right? That'd be worth mentioning!Or are you sneakily using that capacitor to turn the whole system into a monostable of sorts, i.e. have you select the 10k resistor such that it can't provide enough holding current to keep the triac triggered? In that case, clever, but worth calling out

author: mauroh
author_rank: Frequent Contributor
timestamp: July 11, 2015, 11:34:14 pm
content: rs20 is right I didn't mention that i replaced the optotriac with an optotransistor.I don't think to use the optotriac was a requirement.As soon as I got the purpose of the request I proposed an easy solution.Surely it can be achieved in several different ways and this is why we love electronics.BTW removing the capacitor this is just a zero cross detection circuit that will provide a pulse every 10ms (if main is 50Hz). This will be also fine to detect the presence of the main.The capacitor will "smooth" the pulseas and the output to the Micro will remain LOW as long as the main is present.The capacitor can be placed instead between + and - of the bridge...Mauro

author: wraper
author_rank: Unknown
timestamp: July 12, 2015, 07:20:30 am
content: Quote from: mauroh on July 11, 2015, 08:48:08 pmBetter to use H11AA1 and omit the rectifier.

author: LukeW
author_rank: Frequent Contributor
timestamp: July 12, 2015, 10:48:24 am
content: This thread may be of interest:https://www.eevblog.com/forum/projects/isolated-voltage-detector-(ac-mains)/msg696133/#msg696133

author: ASHU
author_rank: Contributor
timestamp: July 12, 2015, 11:46:56 am
content: Thank you very much everyone