![]() Sadly, I couldn’t find a DSLR camera to make a good movie of the test moments. The near-final prototype has been tested inside my lab and worked well over the water’s surface with finer particles and a higher spray level, as expected. Note that when you push and hold S1, the final output voltage (V_DRIVE) will raise up to 26 Vdc until it gets released. The optional momentary push switch (S1) in association with the 2K7 resistor (R6) lets you hike up the mist density for a short time only if desired. It accepts DC input in the 5-V to 12-V range from any another power source, such as a proper battery and/or wall adapter. Note that the power supply section is tailored deliberately to power up the entire ultrasonic mist maker comfortably from an external USB standard power supply. A small heatsink is necessary for the logic-level power MOSFET IRLZ44 (T1). This circuit strictly follows the application example given in the datasheet, so you can tweak it if necessary.Īll electrolytic capacitors in the above two circuits are 40-Vdc–rated, while the 180-µH (180 µH to 220 µH) inductor (L1) is a 1-A “drum core”-type one. 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |