12A switching load and EMC - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 19, 2023, 07:12:51 pm
content: Hi,Is our 12A switching load going to give us any issue with radiated or conducted EMC testing?LTspice and jpg attached.

author: f4eru
author_rank: Super Contributor
timestamp: April 19, 2023, 08:12:26 pm
content: Will not only scare mice, but also HAMs.

author: temperance
author_rank: Super Contributor
timestamp: April 20, 2023, 12:55:04 am
content: AYK, it dp's on the switching sp...AYK, it can be adapted in this cir. bc the per. is 10ms. AYK, it dp's on the loop A of the 2m cable. AYK, sometimes its not the attached circuit causing problems but the power supply itself. AYK, you should always check how they were certified. AYK, you can play a little with the setup. YK nothing it seems AYPK.

author: Faringdon
author_rank: Super Contributor
timestamp: April 20, 2023, 05:48:56 am
content: Thanks,Also, the duty is 50% with period 10ms to 4sec repeatedly sweeping up and down. Willw e get flicker problems.?

author: Zero999
author_rank: Super Contributor
timestamp: April 20, 2023, 07:19:45 am
content: I doubt it will do much to scare mice away. Search for Mouse Trap Monday YouTube channel. Mice invariably get used to things designed to scare them. Flashing lights and loud noises do nothing.Invest in some decent traps. Don't use poison. It can kill predators which eat the poisoned mice.

author: Stray Electron
author_rank: Super Contributor
timestamp: April 20, 2023, 12:58:07 pm
content: I will second the statement not to use poison. If a mouse dies somewhere in your building it will stink like hell until you find it and dispose of it. And if it's dies inside of a wall or some other in inaccessible place then you'll have to live with the stink for weeks. Also use the "rat" traps not the little dinky "mouse' traps. The mouse traps are too small and very often it won't outright kill large mice and other critters and they will struggle until they escape from the trap. I've found that it's usually worthwhile to set two traps next to each other. Quite often a mouse will trip one but will jump out of the way of the striker and won't be caught. But if you put out two traps, they will often land on the 2nd trap. Also if the first trap catches them but doesn't kill them they will struggle and often escape, but if you put out two traps they will often flail around until they land on the 2nd trap and they will usually finish them off.Even if it worked, the flasher isn't adequate to deal with rodents. They breedfastand will quickly overwhelm your defenses. Catch and release doesn't work either, they will soon be back. You need to kill them.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 20, 2023, 10:29:33 pm
content: I'm going to suggest designing a high voltage rat killer. More entertainment for us when he invariably runs into problems trying to design it. For extra credit, add an electromagnetic cannon to launch the dead rat where predators would be fed. And don't forget a camera to catch the action and automatically post it online.

author: Faringdon
author_rank: Super Contributor
timestamp: April 21, 2023, 06:06:08 am
content: Thanks, and would you agree, we are talking shielded cable for that 2 metre bit that goes from PSU to LEDs?Plus common mode chokes.And we would earth the secondary of the SMPS....and continue that earth shield on the cable shield, right up to the leds.Though i dont see us filming the rats, as they wont dare come near our light flasher......they will be freaked out by it.We prooved it by leaving cheese there all night, and it was untouched come the morning.

author: Zero999
author_rank: Super Contributor
timestamp: April 21, 2023, 07:41:04 am
content: Quote from: Stray Electron on April 20, 2023, 12:58:07 pmThe downside to using a rat trap for mice is, the trigger is less sensitive, so might not reliably trigger. Another option is to put the trap between two planks of wood, or bricks, so it's more enclosed and the mouse is directed straight to the trigger.Quote from: Faringdon on April 21, 2023, 06:06:08 amMice aren't too fond of cheese. Try nuts or sunflower seeds.

author: Faringdon
author_rank: Super Contributor
timestamp: April 29, 2023, 10:59:17 am
content: Thanks, and please may i ask, would you agree, we are talking shielded cable for that 2 metre bit that goes from PSU to LEDs? (Pse see top post)Plus common mode chokes.And we would earth the secondary of the SMPS....and continue that earth shield on the cable shield, right up to the leds?