![]() Here, its nominal output is trimmed to 20 Vdc by components R4 and R5. The power supply circuit is a DC/DC boost converter regulator wired around the inexpensive and very popular eight-pin chip MC34063A (IC1). The prototype was successfully tested with a different 105-kHz (±5 kHz) transducer as well. Quiescent capacitor: 3,000 pF (☑5% pF).Here’s an excerpt from its machine-translated Chinese datasheet provided by the seller: I bought the 113-kHz (20-mm) transducer from one of my trusty Chinese sellers at a cost of $2 per unit. Below, you can see two oscillograms (TP2 & TP3) captured while I was running my ultrasonic mist maker prototype wired on a piece of common circuit board. So a dedicated power supply circuitry will be introduced later to fulfill that crucial requirement.īecause the circuit diagram is very simple and self-explanatory, I’m moving on to the rest of the project without giving a detailed circuit description. Even though the ultrasonic mist maker device is configured to run on a single 5-Vdc to 12-Vdc input, this transducer driver needs a 20-Vdc to 26-Vdc (V_DRIVE) power supply channel in addition to a 5-V regulated DC supply rail. ![]() In the circuit, the 5K multiturn trimpot (RP1) can be used to set the oscillator frequency to 113 kHz (±5 kHz) (TP1). As shown in the circuit diagram, it’s a tricky oscillator design based on the ubiquitous tiny time chip NE555P (IC1) to generate proper drive pulse train for the atomizer transducer. ![]() When buying the transducer, make sure that is has a 113-kHz (☓ kHz) resonance frequency - another popular transducer has a 1.65-MHz (☐.05 MHz) resonance frequency, which is not compatible with this project! Ultrasonic mist maker circuit Transducer driver circuitīelow is the circuit diagram of the final part of the project - the transducer driver. As the liquid exits the atomizing surface of the disc, it’s broken into a fine mist of uniform micron-sized droplets, so the key component required for this little project is a particular (20-mm, 113-kHz) ultrasonic atomizer disc/transducer (see below). In an ultrasonic mist maker/humidifier (also called an ultrasonic atomizer), a piezo atomizer disc/transducer (ceramic humidifier) works by transposing high-frequency sound waves into mechanical energy that is transferred into a liquid, creating standing waves. It works fine and is, by far, the easiest ultrasonic mist maker/humidifier that I’ve ever had to get going. The following lays out my easy-to-build ultrasonic mist maker. I found lots of ideas on the internet, but they all lacked in one area or another, so I decided to design one. I needed a simple mist maker/humidifier for a project that I was working on.
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