Robot Platform

Simple Flyback Driver

Step 1 Mount the Transistor Onto the Heat Sink

Do not use this circuit on an unsuitable surface such as a metal table or flammable surface. Check to make sure that your circuit is connected up correctly. Secure an electrode of some sort onto the end of it, sharp pointed nails work well and will give slightly larger arcs than rounded electrodes.

Here is the truth table representing the functionality of this motor driver. Ok so you have made the circuit and it either does not work or it does not work very well. Do your homework and figure it out what exactly do you need. You can also make a small Jacobs ladder by placing two vertical pieces of bare wire close to each other with a small gap at the bottom that gets wider at the top.

Motor Driver - LD - 1

Did you make this project? As current is now flowing through the base the transistor is now forward bias which turns it on.

Yes, but you will have to reverse the collector and emitter connections in order for it to work. What if you want your motor to reverse its direction? Some enamelled magnet wire, single core bell wire also works well too for the primary and feedback coils. Disclaimer I am in no way responsible if you mess up with this circuit.

2n3055 Flyback Transformer Driver for Beginners

Bring the chicken stick close to the base pins on the flyback and go past each one individually. We are having a problem finding the flyback transformer. You should never touch the high voltage wire or any of the flyback base pins when the circuit is turned on. This entire process is done by what is known as a motor driver. Well some things you can do include soldering your driver components onto a single piece of strip-board or making a high voltage capacitor and getting loud sparks.

The process repeats its self thousands of times per second. Do you have anything to say? For robots to do work, you need to know how to control a motor. But how do we control the direction of these motors? This can be achieved by using four switches that are arranged in an intelligent manner such that the circuit not only drives the motor, but also controls its direction.

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Is the heatsink really needed? In the next section, we will start building the board. If you have some alligator clipped wires then you can use these for temporary connections whilst you familiarise yourself with the circuit. You can use a multimeter set to measure continuity or resistance to make sure that everything is making good electrical contact. This takes the voltage of the feedback coil down to almost zero and the transistor falls back into its linear region.

Step 1 Mount the Transistor Onto the Heat Sink

The heatsink is important as the transistor gets hot. You can use an insulator pad if you want but I just used a small amount of old thermal grease I had lying around. The resistor values do not have to be exact. To mount the transistor to the heatsink I just used some spare screws and nuts I had in the garage.

This means you do not have to worry much about voltage regulation. Connect all of the components together as shown in the images above. Even the cable insulation will burn if you draw the arc onto it. If it works but the arc is small try reversing both the primary and feedback coil connections. However, most small motors used in hobby robotics should work.

Bosch BIP Ignition Driver

To find the high voltage return first attach your chicken stick to the high voltage out the big thick red wire and turn the circuit on. Usually in open air, each mm of space needs Volts to make a spark jump.

Although this is not needed for the circuit to work, it protects the transistor from back emf spikes and can help prolong the life of the circuit. Voltage increase as current decreases. You should hear a high pitch noise. Keep any high voltage cables away from other parts of the circuit and low voltage cables.

The simple answer is to reverse its polarity. Generally, even the simplest robot requires a motor to rotate a wheel or performs particular action. This instructable will show you how to make a cheap and simple driver circuit in order to get high voltage arcs out of a component called a flyback transformer. For the high voltage experimenter they are used to make high voltage arcs, m audio fast track driver windows which is what this instructable will show you how to do with just a few simple electronic components.

Current will keep building up in the primary coil until core saturation occurs. Make sure that the transistor pins do not physically touch the heatsink and it is screwed in securely. Make sure that you can easily disconnect the power to the circuit.

As the transistor turns off the magnetic energy stored in the core from the primary coil rapidly collapses giving an even higher voltage pulse on the high voltage secondary coil. Can I use a different transistor? As you can see in the image, the circuit has four switches A, B, C and D. Usually this resolves that issue. Is there another transformer that would work?

Yes, if you are wanting to use this circuit for more than a few seconds the heatsink is vital as the transistor will get hot fast. Following those basic safety steps you will be fine. Disclaimer I am no way responsible if you mess up with this circuit. So be safe and research a bit more.

Simple flyback driver

Wood is fine too but when damp it becomes a good conductor at high voltages. So if you insist on burning pieces of paper or other objects take that into account and have some way of putting the fire out. Donation might help us keep all this information available for free and also pay for the resources. They are the ones that have a big heavy chassis.

In most cases, a transistor can act as a switch and perform this task which drives the motor in a single direction. The transistor heat-sink can get hot so watch out not to burn your hand on it.

If you have tried that and still nothing then you should check the circuit and make sure all connections are secure and nothing is shorting out. If you mess up you have no one to blame but yourself. Mount the transistor onto the heat sink. If this was a non-inductive load then the transistor turning on would effectively be shorting the power supply right now.

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