Where does high voltage come from?

Question

Arduino

There is a scheme. I can't draw, so it's on my fingers.
The arduino is connected through a separate PSU, it produces PWM at a frequency of 122Hz. Next comes the mosfet and a resistor between its drain and + 17V. then a complementary pair, followed by a lower-level mosfet. load - 12V incandescent lamps, 4 pieces of 21W each. Lamps just in case of shunting with a Schottky diode. In order not to burn the bulbs with high voltage, I use a PWM duty cycle of no more than 60%.
At 32kHz, it was not possible to get rid of the heating of the mosfet, I left it to work at the least unpleasant low frequency. Everything works fine, nothing is heated, the arduino is not buggy.
But I accidentally discovered that if you touch a 5V contact or transistors, or even diode contacts, then your finger tingles decently, it’s impossible to hold it.
There is no oscilloscope. Where is there where there should be a constant 5 or 17V - pulsed? I can only guess that light bulbs play the role of inductances and form high voltage pulses. And sometimes they are, and sometimes they are not)
Can this be, or did I mess up something else?) The
bulbs are connected to a 24V power supply with an interior type adjustment of 17-30.

Answer 1

Most likely a PSU without a transformer.

Answer 2

Where does high voltage come from?

from outlet!!1

Answer 3

I will assume that due to resonance, yet the circuit itself has inductance and capacitance.

Answer 4

A light bulb cannot play the role of an inductor

Answer 5

Keep in mind that the resistance of the skin drops with the frequency of the voltage that is applied to it, the lower the resistance, the less voltage is needed for the current that you feel to go through you.
Although there may be a joint in the circuit, life is difficult without an oscillator

Answer 6

The PSU does not have galvanic isolation, so it beats.