High-power 555 Flyback Driver For Mac
I have acquired a flyback transformer from my brother's Broken TV, and I would like to know how to drive it with a VERY simple Circuit, preferably a 555 Timer. I understand the danger's involved, but nevertheless I would still like to complete this project. This is for personal entertainment, not for a class assignment or university.
I know that a flyback transformer requires 12VDC pulsed at around 15khz or 25khz, but I don't know how I would build such a High Frequency circuit, since my hobby had consisted of playing with 555's and the occasional MOT fun. It looks like Heatsink No 4. I found it in the TV my brother had. The screen was about 26 inches wide I would guess.
Yes, MOT Does stand for Microwave Oven Transformer. Nigel Goodwin, I had it running for about 5 minutes straight, so that may also be the reason.
The IRF540 Limits the amount of power that the FT gets, to around 1 amp I Think? It runs nice and cool also, after fixing a few connections that were stray, and recoiling the Exposed Ferrite Core, I am now getting sparks in 1cm+ Lengths. I believe they are around 10kV? If I had more Amps running through the coil, could I get better sparks?
I am glad to hear it worked for you! On mine, I didn't have to worry about the FET heating too much because it was rated to 40 amps or so and it was on a massive heatsink. Lol it was overkill. I did have to worry about the 10 ohm 10W snubber resistor heating.
After about 30 seconds I could have cooked an egg on it. The FET will limit the average power the transformer gets over time (by PWM), but it won't limit the instantaneous current. The amount of current that will be drawn will depend on your flyback and the voltage you are giving the primary. If you are running it at 12V, I would imagine it would be in between 1 and 2 amps. It also depends on what your supply is limited too. What are you using for the voltage supply for the FT?
To have longer sparks give it more voltage and current. I found that around 15-18V at 2.5A was relatively safe and produced inch long arcs. With 12V at 1A I would only get about a centimeter like you reported.
I tried doing a search to no avail, and have been searching any and all media for an answer to what must be a simple question since everyone seems to understand but me. The circuit I am trying to build requires a power source for the 555, and a secondary source to drive the flyback primary with much more power than the timer can handle. I have built ZVS drivers, 555 drivers, 2n3055 drivers, you name it. I even have a wonderful resonant MOT setup. For the life of me, however, I don't seem to grasp how exactly the second supply is to be wired in. It seems you disconnect the primary from the 555 positive supply, and connect it to the second power source, but I have found no details on it. Where does the negative of the primary supply go?
It shows ground, but I have had no success with this. It simply tries to destroy my variac at anything over 12v. From what I can tell, the positive from PS2 goes to the primary and resonant cap, to the the drain and ground, and source goes to ground and in some schematics has a couple caps and a diode on ground side, but I must be wiring it wrong because its simply not working whatsoever, If I omit a second source and limit it relative to the 555 it works, but only just barely, not reaching anywhere near the ZVS levels of power. I'm trying to build a plasma speaker using this, but I can't seem to figure it out and have found no information or anyone willing to even reply to my requests. Can anyone here help me understand what I'm doing wrong? I'm working mainly off the schematic provided by Jozef Bogin, the 'moster 555 flyback driver', but when he mentions the second supply he says to just 'disconnect the primary from the 12v rail', which is exactly zero help at all.
Alright so it's essentially assumed that these are going to a negative rail as well as ground then? My confusion also stems from the fact I could in theory power the 555 timer with a 9v, the FET I'm using (IRFP250N) might make that impossible due to it's minimum working voltage, but if using a 9v battery, I'd be using a much higher power source on the primary side, so I'm curious as to how this will affect the battery if they share a negative rail. Edit: It seems I should brush up on my schematics reading skills. I don't suppose it would be untoward of to ask why it would have no effect on the battery though? Fell free to tell me to do more research,I understand this maybe be all common questions around here, judging by the number of 'flyback' posts I see. In fact, any materials that could be suggested for their efficacy in order for me to gain a better theoretical understanding of these basics would be appreciated, I think the first project I worked on was with a disposable camera cap charger cicuit and several electrolytic caps in series.
Once I started learning more safety was the obvious priority so I've done quite well but there are some chapters I missed, such as powering sectional circuits with different sources at different power levels. The whys of things sometimes elude me. I do plan on being formally educated in all this, but for now I just enjoy it so much I learn constantly on my free time.
I plan on assembling a signal jammer soon, not for use but to better understand RF circuit receiving and transmission. I've obviously like many others been more attracted to the applications of the science rather than the theoretical academic portion, hehe. Well thank you all for your help, it is very much appreciated, and I apologize if any (or all) of my questions were run-of-the-mill annoyances, I didn't expect to have so much trouble finding an answer to that particular question in searches. I'm glad for that though as it seems this site is a very valuable resource for everything electronic! Edit: And going back to my first post. Yeah a schematic would have been nice, I don't know why I assumed anyone would have a frame of reference to what I was talking about, sorry for my noobishness!
High-power 555 Flyback Driver For Mac Free
And just to update/finalize, it turns out I was dumb. The second build I did didn't have the rest of the circuit in series with the capacitor connected to DC input, mistake #1. Then, I had attempted to alter the way the negative rail off the second PSU would connect, mistake #2. The actual fixes were incredibly simple, after what you all helped me to understand. I rebuilt the circuit, put the smoothing cap first, then in series connected the rest off of that (well those, I don't have a 6800uF 18v cap, or even a 6800uF cap at all of any voltage tolerance so I used three 2200uF 18v caps in parallel) then disconnected the primary and resonant cap from the 12v rail running the 555 circuit, connected that to my rectified variac input and used a wall wart smps to run the 555 and simply connected the variac negative to the common negative and hot damn it works fantastic! Now all I need to do is find some decent components for audio input which is simple enough.
High-power 555 Flyback Driver For Mac
Are there any ways to decrease electrical noise from input devices? An iPod does in fact generate a ton and it makes it almost impossible to hear any audio, wondering if anyone has any tricks or insight on this?