I'm trying to build a driver circuit for an ultrasonic transducer for fog making. The circuit is required to generate a 1.6 MHz signal to drive the ultrasonic transducer.
I have found a circuit which seems to be working from here. The author of the video claims that he designed the circuit. Here is the circuit, ( The buzzer symbol is used for the ultrasonic transducer)
The circuit generate a good 1.7 MHz sine wave. However, I am unable to understand what type of oscillator is this. It seems to be a Colpitts oscillator, but I cannot find how to match this with a Colpitts oscillator.
I need to understand the operation of the circuit and how to change/calculate frequency values.