This Supply generates DC high voltage 40kV, with which you can make interesting experiments.
When approaching the grounded terminal to the output of high voltage to about 4-5 cm you can see corona at wire ends
and when you put the wire even a little more closer, you can observe an electric arc.
Experiment 1: Get you hand close to the electrode (about 15-10 cm). You can feel electric wind blowing.
Touch the output. Will feel weak static pulses. (It's not much worse than when you touch the sweater.) When the second hand grasps eg floors, will again feel the static. Different light objects (paper, fabric, different packaging, plastic, but even a plastic ruler) can be sticked to the wall or bottom of the table by the electrostatic forces. Some objects stick to hand. Human hair can stand up slightly, but not too noticeable (for that, Van de Graaf generator with a voltage of hundreds of kV is better). Perform only if you stand on the non-conductive floor and from all electrical appliances you have at least 0.5 meters away! Negative pole of circuit contact to the ground.
Experiment 2: Pu two squares of aluminum foil about the size of 10x10 cm on the floor, one connect to the supply output, the other do not. The gap between the squares leave about 5cm and into the gap put wooden pencil. Perpendicular to the first pencil put another pencil. When you turn the high voltage ON, the pencil starts swinging. (Attracted to the opposite charge and when it touches, and on the other side, as the charge equalises ...)
Experiment 3: Connect screw to the output (head down). Take a thin wire, shape it it according to Fig. 2. and put it on the screw. After turning on the power the wire spins (the one in the Fig. 2. will rotate counter-clockwise).
Circuit description 3: The principle is similar to the previous high voltage supply, but the oscillator is much simpler. It consists of a power transistor and a bulb that replaces power resistor and also serves as an signalisation of operation. The transformer we use with existing high voltage coil and coil with six turns (L1). In the picure below (Fig. 3), the pin 1 is the cold end of the HV winding, which is connected to the ground. Pin 2 is connected across the light bulb to the baser of the transistor. Pin 3 is connected to the positive pole. Main coil (3 turns) must be wound using wire with a cross section of at least 1.5mm2. If the circuit does not work, swap the main winding L2. coil inputs. If you can't identify the 6 turn winding (L2) in the transformer, wind your own. Oscillator frequency is about 25kHz. 60kV voltage is obtained using a tripler, which which is made of the two high voltage capacitors and three high voltage diodes. HV diode can be found in the old television and high voltage capacitor was produced from a glass test tube and a piece of aluminum foil - one pole occurs looping the aluminium around the tube and the second by inserting the aluminium foil into the tube. Between them must be about 4-5 cm space to prevent flashover. This high voltage power supply is powered by DC voltage of 12-15V supply and draws around 2.5 A.