Summary of High voltage supply (10-30kV) made from CRT television flyback transformer
This article describes a DIY high-voltage generator using a flyback transformer salvaged from an old CRT monitor or TV, producing 10-30kV output. The circuit utilizes two transistors and a feedback coil to oscillate energy between magnetic and electric fields. Strict safety warnings highlight risks involving high voltage, toxic gases, radiation, fire hazards, and potential CRT implosion.
Parts used in the High Voltage Generator:
- Flyback transformer
- High voltage transistor (Q1)
- High voltage transistor (Q2)
- Resistor R1
- Resistor R2
- Coil L1 (feedback generator)
- Coil L2
- 9V power source
Old CRT monitor or TV is a great source of electronic components that can be used in DYI constructions. One of them is a flyback transformer that can provide 10-30kV output. The input voltage can be in a range from a couple of volts to over a dozen of volts, power consumption is a couple of watts. In my construction input voltage is 9V, power consumption is 5W.
Waring! The device uses high voltage that can lead to injury or death when used inappropriately. Don’t touch it when power is on.
Waring! The device produces small amount of toxic ozone and nitrogen oxides, don’t use it in closed rooms.
Waring! The device produces small amount of UV rays and X rays, don’t look into the arc for a long period of time.
Waring! The device produces an arc that can ignite surrounding objects, don’t use it near to flammable substances.
Waring! Cathode ray tube present in CRT monitors or TVs can implode if physically damaged, be careful not to break or harm it during extraction of any electronic components like flyback transformer.
The electronic circuit
When current flows though L2 (Q1 is opened) then flyback transformer collects energy (as the magnetic field). When current stops flows (Q2 is closed) magnetic energy transforms into electric energy. Q1 opens and closes periodically because it’s base is driven by a generator made from R1, R2 and L1.
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What is the primary purpose of extracting a flyback transformer from a CRT?
To create a construction that can provide a 10-30kV output with low power consumption. -
Can standard transistors substitute the ones extracted from the TV?
No, the device requires specific high voltage transistors that are hard to substitute and expensive to buy separately. -
Does the device produce harmful byproducts?
Yes, it produces small amounts of toxic ozone, nitrogen oxides, UV rays, and X rays. -
How does the circuit generate high voltage?
Current flows through L2 while Q1 is open to collect energy, then stops when Q2 closes to transform magnetic energy into electric energy. -
What causes the transistors to open and close periodically?
The base of the transistors is driven by a generator made from R1, R2, and L1. -
Is it safe to use this device in a closed room?
No, you should not use it in closed rooms due to the production of toxic ozone and nitrogen oxides. -
What happens if the cathode ray tube is physically damaged?
The CRT can implode if physically damaged during the extraction of components. -
Why should the arc not be looked at for long periods?
The device produces UV rays and X rays which are dangerous to eyesight.
