https://stream.echo6.co/videos/watch/82089059-0d5c-4cb0-8aaf-3b91c572f9b3 This is an interesting twist. This air aroma unit has been completely redesigned to be more compact. I was expecting the circuitry to also have been minimised, but in reality it's similar to the original version with some interesting twists. The power supply for the chip was a bit of a mind bender. I've not see this approach taken before. The unit will operate down to about 3V so is suited for use with rechargeable AA cells. It's been pointed out that the parasitic diode in the MOSFET will bridge the current limited microcontroller supply to the battery voltage with a typical diode voltage drop. That means the microcontroller will only see the full 5V when the batteries are new. That voltage nudge will still potentially extend the run time on a set of batteries though. In hindsight, the crystal will also be providing accuracy to the 8 hours on - 16 hours off timer that this unit uses. The image on the non-track side of the PCB was reversed to aid reverse engineering, and yes their code name for the design seems to be maltesers. Candy codenames are a good way to go. Current draw while actively atomising is:- 400mA at 3V 340mA at 3.5V 280mA at 4V 250mA at 4.5V Standby current at 4.5V is less than 70uA Standby current at 3.5V is less than 30uA If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. #ElectronicsCreators Mon, 13 Apr 2026 16:44:14 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/82089059-0d5c-4cb0-8aaf-3b91c572f9b3 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.