Join Date: Sep 2003
Location: Enfield, Connecticut
Driver circuit for an ultrasonic fogger
I am only partially sure about this reply...
A simple 555 timer should be able to be used to drive a low power pizoelement.
However, these are not standard pizoelements... I asume that you found a place that sells replacement pizoelements. The circutry of the 555 timer uses a relay and a capacitor to trigger an endless loop with a fixed delay, allowing a specific frequency to be achieved. There are several sites that have 555 timer calculators to help you get the frequency that you want. Most timers can drive small devices directly, others may need an additional transistor to boost the power to the pizoelement.
If this sounds complicated to you... then buy a full setup. I don't want you getting zapped. The circuit isn't the expensive part of the fogger, it is the metal case, powersupply, and the novelty. In reality, these things only cost about $15.00, if they have a good powersupply. Most do not, and you get a cheap powersupply that burns out after 30 days.
The terra foggers that I have, have giant power supplys that get real warm, and will last for years. They are also as large as a computer power supply, which tells me that they are real inefficient power supplys, the more heat a power supply gives off, the more power that is wasted. However, a small wall blister power supply will fry quite quickly.
20Gal. Long (Green-House) and 55Gal. Tall (Primary Tank)
4 Fire-Belly Toads, 2 Fire-Belly Newts,
2 Giant Black Millipedes, 1 Grey Tiger Salamander