Inside a Phytosun ultrasonic oil atomiser - with schematic

They seem to be dumping these things on eBay at the moment. I wonder if that's due to poor sales or technical issues. During the exploration of the product I found two issues that were not microcontroller friendly. One was a lack of power supply filtering (it literally just needed another resistor and capacitor) and the sharing of a track between a high current switching circuit and the power pin of the microcontroller. Both pose a slight risk of causing processor instability, with the risk of a drive transistor being left powered in the event of a crash.

Much of the negative feedback suggested that the users may not have fully understood how to use the units, not helped by the instructions being in French, but with a reasonable image guide too.

The circuitry consists of a microcontroller controlling two transistors that push and pull the primary of a small step-up transformer. The output then drives a very neatly designed piezoelectric atomiser with a novel self levelling support system.

In use, the unit squirts out two fine jets of oil every 10, 30 or 60 seconds, depending on the setting.

The use of atomised essential oil for air sterilisation seems to be a common French thing. I bought an air powered oil nebulizer from a pharmacy while working near Paris.


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