A slightly frustrating teardown (Patreon)

Published:

2024-04-18 16:48:22

Imported:

2024-05

Content

There's so much weird circuitry in this unit. Notably the strange dual base transistor drive, possibly for feedback of an overcurrent situation on the sensor. Initially I thought it was to detect when it had come up to temperature by a PTC effect, but that would have the opposite result. Unless the heater film has an NTC characteristic.

The rest of the circuitry seems to allude to using digital trickery to get an analogue reading. As if they used a digital-only chip.

https://youtu.be/AgMaUzxkeSI

Files

Airwick fart neutraliser - with schematic

Seriously... This unit was supposed to be able to detect farts and then quench them with chemical aroma on demand. Well it did until I broke the sensor (not with a fart). I'm not sure if these are still available in other countries, but they weren't on the shelves long here. The circuitry is interesting, but bizarre. In hindsight I could have emulated the sensor with a variable resistor and seen how it affected the other circuitry, but as it is probably only switched on briefly at an unknown timing it would have taken a long time to catch it in the act. It may also test in very short time bursts, so without a data logger it would have been tricky. The design of the circuitry is surprisingly complex and makes me wonder if they just squeezed the max out of a basic function chip to keep costs low. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators