This single transistor flyback driver topology was created in response to achieve higher efficiency and higher output voltages from ordinary crt television flybacks. This is efficient flyback driver circuit, a good and fairly efficient flyback driver circuit. This good detail both circuit diagram,pcb,part assembly,layout and show case in completed set that you can make with this information for 50 watts power amplifier. The heart of the circuit is a ferritecored flyback transformer. Probably the very first high voltage device built by any enthusiast. This one uses a flyback transformer without a high voltage rectifier or with the. While rated at 5 amps collector current they can provide the needed current gain and voltage isolation for the pnp mj2955. Mar 17, 2012 hi jozef, i have a cool update to show you and because of that you could add one more type of flyback transformer to the list a handmade flyback that i painstakingly made from an old recycled crt tv yoke that i first needed to take apart carefully, pulling the wire from it and winding it on a temporary cardboard toilet roll to save it for later use was pretty time consuming but it got a lot. Flyback transformer from an old computer monitor driven with only 1 transistor using a feedback from the flyback transformer. So for my first real flyback driver, i built a dual 2n3055 transistor based flyback driver. Flyback driver circuits high voltage with a television flyback transformer. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers.
Ultra simple single transistor flyback driver circuit. A half bridge flyback driver is a neat project for any beginner hv enthusiast, which reflects much of the way a commercial high voltage power supply might be made. A very simple road to your basic high voltage generator is the transistor driven flyback transformer. The circuit inside the enclosure comprises a lowvoltage, rawoutput dc power supply driven from a variac, and the resonant driver circuit shown in the following schematic diagram click to enlarge. Using a mosfet instead of a 2n3055 would allow you to use much lighter resistors, a 14 watt, and they could be 100 times their current resistance because a mosfet is essentially a transconductance amplifier while a 2n3055 is a current amplifier, hence the need for lower resistance values. Although you could use this design to deliver 20 amps with almost no modifications and with a proper transformer and a huge heat. The danger is minimal, as fly back transformers are intrinsically low power devices.
Zvs stands for zero voltage switching, which bascicly means that when there is zero volts across the mosfet it turns on and then lets current trough,this inturn causes very little heating, so for example if you ran it of 12volts the mosfets would only produce minimal heat. This driver is capable of pumping upto a kw of power, so impressive arcs can. This circuit uses a common flyback transformer you probably have more than one in your house right now to boost typical battery voltages up to the multi kilovolt range. This article describes you how to design a variable power supply circuit which will provide 0 to 28v at 6 to 8 amps. Sep 23, 20 homebuilt 30kv high voltage power supply. The 2n3055 is a silicon epitaxialbase planar npn transistor mounted in jedec to3 metal case. I used a long terminal strip to arrange the resistor components. It uses two 2n3055 power transistors in a pushpull oscillator configuration. Be aware of the capability of your flyback bw monitors up to 15 kv, color up to. This is an efficient flyback driver circuit, a good and fairly efficient flyback driver circuit.
Normal operation from 12v only results in about 100w, but thats still several times what the 555 drivers will process. This is probably the most well known flyback transformer driver circuit. You know you have found the right pin to which the anode makes a continuous arc. More importantly, the high voltagehigh frequency output from the flyback will instantaneously destroy any electronic equipment it comes into contact with. In some side notes the person said that instead they used a 2n6673 npn power transistor.
Internal schematic diagram october1995 absolute maximum ratings symbol. Variable power supplies are available in different ranges but they provide very low current of one or two amperes, they cant drive high power devices like motor or high power lamps. Universal resonant transformer driver highvoltage flyback. Simply take the hv lead and bring it near the pins on the bottom. Use a 3a symmetric power supply for mono application and a 5a for stereo power amplifiers. I was wondering, would just any power transistor work.
I recommend purchasing one of these completed, working units. Unlike a normal transformer which operates at 50 60hz, a flyback transformer is designed to operate at high frequency, so we cannot simply. Circuit diagram 50w70w power amplifier with 2n3055 mj2955. Higher currents are available but the output voltage will drop.
Mar 20, 2015 this is probably the most well known flyback transformer driver circuit. You can easily pump several hundreds of watts into the flyback transformer and the output current would be around 50ma to 200ma or even more, which is way above the lethal rate which is 10ma. This circuit, also incorrectly known as the 2n3055 flyback driver, bears some resemblance to the battery invertercontinuity tester which is published here. My 24kv high voltage jacobs ladder from diy flyback transformer driver using 555 timer. Mar 14, 2015 i have also included inductors used as chokes to suppress any voltage spikes from the driver circuit. Flyback driver circuit this is a instructable that contains scematic and pictures of a single transistor flyback driver. This is a very simple and cheap circuit to achieve around 20 kv high voltage, but where it excels in simplicity it lacks a lot in stability and. Pinout for those of you who have never seen a flyback transformer before, it may be a bit tricky to know where the primary, ground and other pins are. The arc is a hot plasma, never operate the circuit in presence of flammable substances. Solid state tesla coilhigh voltage generator thursday, april 07, 2011 4. Oct 17, 2019 efficient flyback driver high volts circuit using ic555.
Be careful if building any of these, high voltage can be dangerous. Sam goldwassers flyback transformer circuit don klipsteins. If you prefer text over video he was kind enough to share a schematic and. Even if you are designing your own custom circuit, it is worth observing the layout of a typical zvs circuit. Or you can use a secondary with only a few turns of tick cooper wire, to get a current so high, that can melt thin copper wires connected across the output. Oct 20, 2007 using a mosfet instead of a 2n3055 would allow you to use much lighter resistors, a 14 watt, and they could be 100 times their current resistance because a mosfet is essentially a transconductance amplifier while a 2n3055 is a current amplifier, hence the need for lower resistance values.
The problem is that the mosfet gets very hot in a few seconds. Internal schematic diagram august 1999 absolute maximum ratings symbol parameter value unit npn. The first and simplest driver designs generally consisted of a single silicon switch driving the transformer in flyback mode, which turns out as quite. I dont think that steven dufresnes flyback driver is. It consists cathoderay tube tv high voltage transformer driven by a high frequency inverter, in order to obtain hv output. Typically the circuit calls for the 2n3055 power transistor. It will make a several thousanddegree continuous 2 cm plasma arc.
Unlike a normal transformer which operates at 50 60hz, a flyback transformer is designed to operate at high. It is the same topology with almost the same efficiency, and its actually a nice. Flyback transformer driver for beginners electronic circuit projects. Circuit diagram page 6 of 14 static tesla coil using flyback. May 23, 2016 demonstration of a single transistor 20kv flyback driver. The power supply must supply at least 23 a if you want decent arcs 20000 kv dangers. You can use 2 x 2n3055 transistors in a better circuit that provides more power.
Highvoltage dc converter pcb flyback flybacktransformer highvoltagedc generator pcb modules these flyback transformer based highvoltage modules can generate a positive, highpotential from as little as 1. The resulting simplicity of this circuit pardons the low output efficiency schematic. Can a 07 npn transistor be used as a substitute for a 2n3055 in a flyback driver circuit. This project involves high voltages several 10s of kv, which creates electric sparks that. Finally, i have put two inline diodes to stop any ac currents flowing back up from the driver circuit.
Flyback transformer driver circuit diagrams, schematics. An excellent choice for a predrivers for both the 2n3055 and mj2955 are the tip120 and tip125 complementary darlington power transistors. Jul 20, 2008 so for my first real flyback driver, i built a dual 2n3055 transistor based flyback driver. The mazilli zvs flyback driver is wellknown throughout the high voltage community for its simplicity and ability to deliver 20 50 kv at high currents for a flyback transformer. High current lm317 power supply circuit making easy circuits. Alright so i am making a flyback transformer driver, however, in the schematic it asks for a 2n3055 transistor. Pdf static tesla coil using flyback transformer vijay badgujar. Efficient flyback driver high volts circuit using ic555. Introduction a flyback driver is a common amateur high voltage generator. Creating an electric arc ive always wanted to create an electric arc but dont know how. It is currently set to run between 1750 khz, which should be a large enough. High current adjustable power supply circuit using lm317. Standard monitor flyback transformer with new primary. Since the leakage inductance of the transformer provides the current limiting, and there is never dc component on the primary, arcs can be safely drawn from the transformer without.
Introduction the mazilli zvs flyback driver is wellknown throughout the high voltage community for its simplicity and ability to deliver 20 50 kv at high currents for a flyback transformer. In fact you can even use a 12w for the 27 ohm resistor, but it may burn out if it is left to run for a long time. At 2 kv, more than 10 ma may be possible depending on your particular flyback transformer input voltage and current. May 21, 2007 my 24kv high voltage jacobs ladder from diy flyback transformer driver using 555 timer. I was looking for newer flyback driver designs and came across this one after quite a bit of searching. Transistor driven high voltage flyback transformer page. Jan 10, 2018 the high current lm317 power supply circuit shown down the page makes use of an supplemental winding or possibly a independent transformer to deliver power to the lm317 regulator in order that the outboard pass transistors are able to work nearer to saturation and strengthen efficiency. The flyback driven in this way can supply a significant current, aldough the heart fibrillation starts at 30ma i recommend caution to avoid painful arcburns. A very simple audio power amplifier circuit built with 741, 2n3053, 2n4037, 2n3055 and mj2955 which deliver up to 50w on a 8.
The ground pin can be found by finding the pin the hv arcs to the most. Please take good precaution when use this audio amplifier. Ultra simple single transistor flyback driver circuit parts you will need, and how to get it working updated. Demonstration of a single transistor 20kv flyback driver. Mazilli zvs flyback driver kaizer power electronics. This circuit isnt precisely the 2n3055 driver you have seen on other websites, as the two highwattage resistors used in those schematics are.
Nov 17, 2010 this is the modified 2n3055 flyback driver, as you can see, it provides a good power supply for experimenting with very high voltages and lower currents for example, strong static fields or x. Here is a list of high voltage power supplies with schematics and construction details, going from simple to complex. Then i come across the theory that air breaks down at about 1mvm mega volts per meter 24kvin. I used a 9v battery to power the ne555 and a 24v 6a power supply to power the flyback. This simple driver circuit is quite efficient if tuned correctly, and in some cases quite. A transistor driven flyback transformer page angelfire. This circuit uses a common flyback transformer you probably have more than one in your house right now to boost typical battery voltages up to the multikilovolt range. Q1, q2 2n3055 or similar npn power transistors reverse polarity of vcc if. So, if you brush against the wire while youre operating an oscilloscope, or changing the channel on your tv who would watch tv with a flyback driver on. Not only the zvs flyback driver is powerful, but it is very dangerous.
These flybacks are the ones that are mostly used in todays tvs and such, they can usally output 50 60 kv without failing,but i have personaly ran one at 110kv. For example, a large color tv crt may require 20 to 50 kv with a horizontal scan rate of 15. It is the same topology with almost the same efficiency, and its actually a nice example what happens when a primitive circuit like this is used with slightly. Most of the others i had seen were simple 555 based drivers and ones similar to the single or double 2n3055 transistor design. The next flyback driver is by far the most powerful and efficient. That corona discharge between the highvoltage anode and a concrete wall is also spectacular. This driver is capable of pumping upto a kw of power, so impressive arcs can be made. Obtain flyback transformer with known good hv secondary winding. As you can see from the schematic below, it doesnt get much simpler than this. All parts can be obtained easily from radio shack, including the mosfet.
These drivers were prone to failure and had high losses in the switching devices. You may also use the zvs flyback driver with a ferrite core and a custom made hv secondary, see this article. This is an easy to make power supply which has stable, clean and regulator 028v 68 amp output voltage. Mar 21, 2015 a very simple audio power amplifier circuit built with 741, 2n3053, 2n4037, 2n3055 and mj2955 which deliver up to 50w on a 8. I build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. The gist of it is that while one 2n3055 overheats very quickly, 2 paralleled 2n3055s will be able to split the current load and avoid overheating too rapidly. Unlike a normal transformer which operates at 50 60hz, a flyback transformer is. Introduction a flyback transformer fbt, also called a line output transformer. So to get through such problems i introduce a high current variable voltage power supply circuit which can drive 10a of load, the current handling capacity can be increased simply by. Flyback transformer drivers uzzors2k hobby projects site. The last part of the circuit is the flyback driver circuit as seen previously and is separated form the dc supply via a switch. By using two 2n3055 transistors we become more then 2 times the amount of amps then the power supply delivers, making it real though to brake.