Created through trial and error. The first voltage pulse is input manually with the button. This then controls a MOSFET, letting current go through a (step up?) transformer. On the secondary side of the transformer there’s a capacitor, forming a tank circuit. The sinusoid output of the tank circuit goes through a zener diode go keep the voltage regulated. This signal is sent to a BJT which operates as an inverter. (I also added a regular diode here to ”protect” the BJT). The BJT produces a square wave with the same frequency as the tank circuit. This square wave goes through a MOSFET which also acts as an inverter. Finally, this signal is sent back to the first MOSFET, producing a self-sustaining oscillation. I have no idea if this is a realistic circuit or if it’s a weird implementation of some very well known circuit that I should know about, but hey, I’m a biologist not an engineer. I also added a little voltage multiplier for fun.
