High Voltage

Kirlian Photography power supply

This device is essentially a high-voltage variable-frequency ac supply. ? CD4049 IC multivibrator circuit drives a Darlington connected transistor pair, which drives TR2, an ?? transformer...

13KV High voltage power supply

This high-voltage power supply has an inverter around Q1 that supplies 150-V pulses to the converter of SCR1 and C2. The output of ?2 is a 4.5-kV pulse that is multiplied by the voltage-tripler network (right) to produce 13.5 kV. ?1 is a 3-k? to 500-? CT transistor audio transforfiler, ?2 is a flash tube trigger transformer with a 6-kV secondary. ..

12V DC to 85V DC Converter

The circuit below is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator. The circuit is not very efficient but will produce a high voltage usable for low power applications. The input battery voltage is raised by a factor of 10 across the transformer and further raised by a voltage tripler consisting of three capacitors and diodes connected to the high voltage side of the transformer. ..

Capacitor Discharge Ignition

The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and MOSFET (IRF510) are used to drive the low voltage side of a small (120/12 volt) power transformer and a voltage doubler arrangement is used on the high voltage side to increase the capacitor voltage to about 340 volts. ..

Flyback Transformer circuit with 555

The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a 2N3904 and a 2N3906, which are cheap, and easy to find. The totem pole ensures the gate being charged and discharged very fast (approx 50nS i think). The IRF840 is a cheap (i found it for 4euros) reliable and powerful power mosfet, it has current capability of 8 A continuous and 32A pulse, 800V drain source voltage, protecting internal zener diode...

Tesla Coil schematic

Similar to the two transistor solid state Tesla Coil already on this site, this solid state Tesla Coil design uses a normal flyback transformer to generate it's high voltage output. Unlike the other circuit, this one does not use two huge power transistors and high wattage resistors. Instead it uses a 555 timer to more efficiently drive a single MOSFET. It's waveform has adjustable off and on time, making for an efficient circuit with little waste heat. It can be adjusted to drive most commonly found flyback transformers and can operate from a 12V to 18V supply. HV output can reach 60KV or more depending on the transformer and supply voltage...

Tesla Coil using 555

Single transistor flyback driver caused many problems due to it's operating principle. I received e-mails from people who were unable to get it functional even when they are sure that their flyback and transistor is OK. In addition, since it's resonance frequency is determined by every part of the system, when you try to draw an arc from the transformer, it changes dramatically in most of the cases. Just because the operating frequency is important for the safety criteria, (both for mine and power transistor's), I decided to make it run on a constant frequency and built up another simple circuit, trying to stay in the specified limits of the 555 timer...

High Voltage power Supply

A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of fences. Here the current requirement is of the order of a few microamps. In such an application, high voltage would essentially exist between a live wire and ground. When this live wire is touched, the discharge occurs via body resistance and it gives a non-lethal but deterrent shock to an intruder. The circuit is built around a single transistorised blocking oscillator. An important element in this circuit is the transformer. It can be fabricated on easily available ferrite cores. Two E sections of the core are joined face-to-face after the enamelled copper wire wound on former is placed in it. The details of the transformer windings are given in the Table...

The first 5 circuits described in the following sections were reverse engineered from commercial HeNe power supplies. There may be errors in transcription as well as interpretation. In many cases, the transformer secondary voltage was not marked and where the actual hardware was not available for testing, an estimate of its value was made. Many of these designs are quite old since modern commercial units tend toward inverter designs since they can be more compact and have higher efficiency. Unfortunately, these are nearly always potted in Epoxy and impossible to analyze. ..

30KV Power supply / Generator

Easy to build, this high voltage generator is capable of generating up to 50KV but the breakdown voltage of the coil limits the voltage to a value somewhat lower. T2 is the ignition coil of a car and also the 0.5µF capacitor comes from the same place: actually I suggest using only this type of capacitor. T1 is a small transformer with a laminated iron rod, with a square section of 7x7mm, 57mm long with 75 turns on the collector side and 25 turns on the base side made with a 1mm enamelled wire. Its implementation is not critical and I expect that the circuit will work with a wide variety of transformers including ferrite ones. ..

Electric Fence circuit

A circuit design, based on a C-mos chip to Drive a Car Ignition Coil. This is a Very Simple and Efficient Design for an Electric Fence. It puts out a Very high Voltage Current pulse, yet it draws a very small average Current from the battery or supply. As Accurate as I can Measure, the "AVERAGE Current Draw" varies between: 20 uA at at Slow Pulse setting to about 85 uA at the fast pulse setting. So Battery life is "Really Good" and this makes a Good Electric Fence. Due to a High Peak Current Draw, this Fencer will NOT work properly, just running from a Power Adapter or a work-bench power supply. This Electric Fence Should be powered by a 12 Volt Battery and this battery. Should have a Trickle Charger on it. ..

HV Ignition Coil Driver using 555

A Simple design based on a 555 to Drive a Car Ignition Coil. I Designed this for a Small Electric Fence to Protect my Vegitable Garden from some Small Animal called a Marmots. Last year they ate one of my crops entirely before I could install this device. A Few Shocks and No More Probem. My Garden is on Raised beds and the High Voltage wire is just 3 inches above the wood frames on homemade PVC Pipe Insulators. Could be Quite useful for persons that have Rabbit Problems also, with the wire raised a bit higher, But Read Warning Below. Definately Makes a STRONG Electric Fence. However, because it is a Continuous pulse output, ..

5000 Volts arc supply

A Very Low Current, High Voltage Spark, that is "Manually Triggered". Although its not easily Measured, the Peak Ouput voltage will be over 5,000 Volts. T1 is a small audio transformer and it steps up the voltage to about 500 Volts at Point "X" on the schematic. The main power limitation to this device is T2. It can be a Standard Trigger Coil, like those used on Strobe Kits, or a Custom made Trigger Coil. For A Custom coil, You can wind one Simular to those in my Stun Gun Write-ups. Which-Ever Coil you use for T2, If you try for Too long of an Arc, It will Arc Internally, Permanently Shorting itself Out. So Start with a Small Arc and Slowly Increase it to try and find the Maximum Distance. Than Reduce it Slightly to give a small Safety Margin...

Car Ignition Coil Driver gives 15kV

This Spark Can Be Very DANGEROUS, So BE CAREFUL. WARNING: FAILURE TO DO SO: WILL CAUSE THE CASE OF THE COIL TO ALSO BE ELECTRIFIED! NOTE You MUST have a LOAD on the High Voltage Output. With NO LOAD, you have a High Risk to "Damage the Ignition Coil". Either a Spark Gap or a High Resistive Load is suitable. A 220 or 240 VAC @ 50 Hz Version is Definately Possible. Sorry but I don't have that AC power source to test one out. Lastly, If you Build this circuit, Its at your own Risk. I Will Not accept responsibility for what you do! ..

Stun Gun with 555

This stun gun is powered by a 9V battery. The transformer steps up the voltage to about 1800V (but with very low current). A 555 timer IC is used to generate a high-frequency output. A 1 MEG variable resistor can also be used at the output to drop the voltage, but this is optional. If you build this circuit, be careful, as it outputs a high voltage. Touching the output leads will induce a painful shock. ..