Low Voltage to 30 kV Out


Posted on Feb 5, 2014

The basic circuit described in this document is capable of generating up to 30 kilovolts or more from a low voltage DC source using the flyback (LOPT) transformer salvaged from a B/W or color TV or computer monitor. Typical output with a 12 VDC 2 A power supply or battery will be 12, 000 V. Maximum output current at full voltage is typically around


Low Voltage to 30 kV Out
Click here to download the full size of the above Circuit.

1 to 2 mA. Higher currents are available but the output voltage will drop. At 2 kV, more than 10 mA may be possible depending on your particular flyback transformer input voltage and current. Before thinking about experimenting with anything using or producing high voltages, see the document: Safety Guidelines for High Voltage and/or Line Powered Equipment. While the circuit described below isn`t likely to be lethal using the suggested input voltage and components, who knows how you might `enhance` it! :-) +Vcc Q1 +-+ o | ):: | B |/ C ):: | +-| 2N3055 ):: | | | E 5 T ):: +-|>|-o +HV | | | )::( HV Diode, usually | | -_- )::( built in. | | )::( +-|-+ ::( | | Q2 _-_ )::( | | | )::( Secondary (HV) winding, | | B |/ E 5 T )::( intact. | | -| 2N3055 )::( | | | | C )::( | | | | )::( | | | +-+ ::( | | | ::( | | -+ :: +-o -HV | | 2 T ):: | | +-+ :: | | | 2 T ):: T1 - Flyback transformer from B/W or | +-+ color TV or computer monitor. | | | R1 | R2 +-///-+-///-+ 110 27 _|_ 5 W 5 W - TO3Pn TO220 _ _ / | o | | O | View from front (label side). |-| |-| |Label| | | B = Base, E = Emitter, C = Collector. |_| | Label | | | | |_| If there is an exposed metal tab, that is | | | | | | the Collector as well. B C E | | | B C E A slightly modified version of this basic circuit which I use as an RF source to excite a glow discharge in helium-neon laser and other gas discharge tubes is shown in: Flyback Based RF Source. This one uses a flyback...




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