Very small AC/DC converter - Page 1
Forum section: electronics / projects

author: webtop
author_rank: Contributor
timestamp: November 03, 2017, 06:34:25 pm
content: I'm looking for component recommendations for building a 110VAC to 5VDC circuit, that needs to be very small. The circuit will be used to drive an ESP8266 housed inside a wall socket. I've seen similar projects were people just use a USB charging device, but I'm not sure how safe that really is, to be inside of a wall.I know, also, that most of the parts used in these devices are bought in the 1000's, and I only need about 10 circuits.Product recommendations, circuit design recommendations, product purchase location recommendations...all are welcome.Thx

author: Mjolinor
author_rank: Frequent Contributor
timestamp: November 03, 2017, 06:40:35 pm
content: If it is entirely shut away from anyone then you can just drop the AC supply with a couple of capacitors and a couple of resistors then rectify it and if you need it to be accurately regulated then put a 7805 on it or similar. Fuse it to be safe and for sure if it is accessible at all then do not do it this way, use a proper isolated supply.I am thinking maybe wifi repeater where nothing connects physically.

author: Ice-Tea
author_rank: Super Contributor
timestamp: November 03, 2017, 08:18:03 pm
content: Quote from: Mjolinor on November 03, 2017, 06:40:35 pmUnless you have tons of electronics experience and/or like a good house fire: please don't stuck any DIY self made offline PSU in your wall?One of these would be marginally better:https://www.tracopower.com/products/browse-by-category/show/ac-dc-power-supplies/encapsulated-modules/tmsb-2/1/

author: edavid
author_rank: Super Contributor
timestamp: November 03, 2017, 08:30:35 pm
content: If you only need 10, you are going to be better off reprogramming a Sonoff.https://www.itead.cc/smart-socket.htmlhttps://www.itead.cc/sonoff-s30.html

author: webtop
author_rank: Contributor
timestamp: November 03, 2017, 08:39:27 pm
content: I looked at that as a way to go at first, but where is the fun in that?I like to build stuff, to learn how it works, then I can use that knowledge in the future. If I didn't care for knowledge I would just have someone come in and wire a home automation system for me. I'm a maker, a hacker, someone who loves learning how things work, so just buying a solution is not what I'm looking for.thanks

author: webtop
author_rank: Contributor
timestamp: November 03, 2017, 08:41:50 pm
content: I saw some buck converters from Hi-Link that purportedly take a 125VAC line and output a 5VDC line. I ordered a couple to dismantle and test. I imagine they are similar to what you're talking about

author: edavid
author_rank: Super Contributor
timestamp: November 03, 2017, 08:53:11 pm
content: Quote from: webtop on November 03, 2017, 08:39:27 pmIn the softwareWhere is the fun in hooking up a power supply module and a relay to an ESP8266 board?

author: ivan747
author_rank: Super Contributor
timestamp: November 05, 2017, 02:00:03 am
content: Quote from: webtop on November 03, 2017, 08:39:27 pmDude, houses in your country are made out of wood... Just don't... At least make something external.