rwilsford07 @ instructables.com:
A boost converter works in two stages, ON and OFF. In the ON stage the Semi-conductive Switch is conducting and current builds up in the inductor producing an electromagnetic field, this field stores energy. In the OFF stage the Semi-conductive Switch does not conduct and the electromagnetic field collapses. When the field collapses the energy stored in it can not escape through the Semi-conductive Switch so it goes through the diode and into the load/Capacitor at a much higher voltage. This happens several thousand times a second via the pulses from the NE555 Timer Chip and the result is being able to charge a high voltage capacitor from a low voltage source. Below is some aid for those of you who do not know electronics well.
DC-DC HV Boost Converter - [Link]
I found some old pictures of me playing around with a flyback, and I wanted to test out this awesome gallery thing I found, so I mushed them together, and well, here they are!
High-voltage arcs using a flyback transformer from a monitor - [Link]
Teravolt.org – DIY High Voltage Capacitors… [via]
Sure making a cap out of paper is fun and all, but making a high voltage one is even more fun!
You don’t need lots of money to make high voltage capacitors, in fact some pretty decent ones can be made with some cheap and readily available materials. This is because capacitors are very simple devices; consisting only of a dielectric and two plates. Most often a capacitor’s plates are just aluminum foil, and reynold’s wrap is easy enough to obtain, but what about the dielectric?
Enter the overhead projector sheet. Transparencies as they are commonly known as are nothing but acetate film, and while this is not the ideal dielectric for a capacitor it still does quite a good job. Typically a four mil OHP sheet can withstand 14kV before breaking down. As for obtaining them, the cheapest I have found these sheets is $10 for a box of 100, enough for about 16 capacitors.
How you make the capacitors is a rather trivial task, all that needs to be done is some cutting, flattening and rolling. Below I have an image that explains the process. Multiple sheets of OHP sheet are used to increase the capacitor’s voltage rating, and two sets of sheets are used so the capacitor can be rolled up.
DIY High Voltage Capacitors – [Link]
rsdio writes: Although this circuit does not directly show how, you can use the same idea to make a 3.3 V tolerant I/O pin control an LED with a much higher voltage. The caveat is that all of the current still passes through the I/O pin, but at least you can control several LEDs in series to get more brightness without the necessary higher voltage posing a problem.
A Darlington transistor pair should allow the current to be increased beyond the I/O pin limits, thus breaking free from both voltage and current limits. The latter is left as an exercise well beyond the app note’s content. [via]
Although many LED-driver ICs operate at relatively low voltage, this application note shows how to operate the MAX6974 at higher voltage by adding a common-base-transistor level shifter, allowing it to drive multiple LEDs in series.
Control high-voltage LEDs with low-voltage pins - [Link]
Mark Rehorst build his own Van de Graaff generator and documented the procedure on the article below. Van de Graaff generator is a device capable of producing high voltages by collecting electrostatic charges on a large metal sphere. The high voltage generated is able to make peoples hair stand up! Check the article below for construction details. [via]
DIY Van de Graaff generator - [Link]
This SMPS boosts low voltage (5-20 volts) to the high voltage needed to drive nixie tubes (170-200 volts). Be warned: even though this small circuit can be operated on batteries/low voltage wall-worts, the output is more than enough to kill you!
EagleCAD CCT & PCB files
MikroBasic Firmware Source
High Voltage Switch Mode Power Supply (SMPS)/Boost Converter for Nixie Tubes - [Link]
Steve creates a high voltage flyback transformer driver for a computer CRT flyback transformer. While the schematic and code for driving the transformer are extremely straightforward and simple, finding and obtaining a high quality solid state flyback transformer can be difficult. Please note that the voltages generated by the flyback transformer are potentially very dangerous, so extreme care must be exercised when building and/or using the schematic presented in this project. Diode split flyback transformers (like the one used in this project) can output 25kV or more.
PIC12F683 High Voltage Flyback Transformer Driver - [Link]
If you are a fan of AVR and you need to disable RESET pin and use it as regular pin you will need a High-Voltage programmer of AVR microcontrollers.HVProg is a nice High-Voltage parallel programmer.It is a redesign of the original STK500 without all components of a development board. It is based on the original ATMEL schematics that are freely available on the net (i.e at avrfreaks.net). The main target was to keep all nessecary functionality to programm all available AVR controllers in every programming mode that the STK500 supports. [via]
HVProg-High-Voltage programmer for AVR – [Link]
OK, maybe rolling your own vacuum tubes was a bit difficult? Why not start out by trying to make your own plasma globe? It uses an off the shelf 250 mL flask, saving you the difficult glass blowing parts. This isn’t a step by step like instructables, but it is a great starting point with a bunch of useful information. It would be a great addition to your Jacobs Ladder. [via]
Make your own plasma globe - [Link]