Mini High-Voltage Generator

Posted on Feb 6, 2014

Here`s a project that could be useful this summer on the beach, to stop anyone touching your things left on your beach towel while you`ve gone swimming; you might equally well use it at the office or workshop when you go back to work. In a very small space, and powered by simple primary cells or rechargeable batteries, the proposed circuit generat

Mini High-Voltage Generator
Click here to download the full size of the above Circuit.

es a low-energy, high voltage of the order of around 200 to 400 V, harmless to humans, of course, but still able to give a quite nasty poke` to anyone who touches it. Quite apart from this practical aspect, this project will also prove instructional for younger hobbyists, enabling them to discover a circuit that all the oldies` who`ve worked in radio, and having enjoyed valve technology in particular, are bound to be familiar with. As the circuit diagram shows, the project is extremely simple, as it contains only a single active element, and then it`s only a fairly ordinary transistor. As shown here, it operates as a low-frequency oscillator, making it possible to convert the battery`s DC voltage into an AC voltage that can be stepped up via the transformer. Using a centre-tapped transformer as here makes it possible to build a Hartley` oscillator around transistor T1, which as we have indicated above was used a great deal in radio in that distant era when valves reigned supreme and these was no sign of silicon taking over and turning most electronics into solid state`. The Hartley` is one of a number of L-C oscillator designs that made it to eternal fame and was named after its invertor, Ralph V. L Hartley (1888-1970). For such an oscillator to work and produce a proper sinewave output, the position of the intermediate tap on the winding used had to be carefully chosen to ensure the proper step-down (voltage reduction)...

Leave Comment

characters left:

New Circuits



Popular Circuits

Micro-Cap 9
Ready set goi
Quality Stereo Wireless Microphone or Audio Link
Driving a buzzer
Scheme research and design of the ultrasonic range measurement system
thermometer circuit using lm335
Audio Oscillators
General purpose RF receiver
TDA Amplifier Circuits
BCD to Seven Segment Decoder IC description
Pultec EQP1A Equalizer
Metal detector 8