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Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
I can likely scare up an old CRT PC monitor...was thinking a flyback circuit to start off with, but was concerned it might be a bit strong for my first project. Will see if I can find a pic of a CRT monitor's guts with the components labeled so I can get a better idea of the bits and pieces first.
Dave...wow, thanks for the offer! If I don't find a monitor in the attic (I think there's an old 14" one up there somewhere), I will take you up on that. Any interest in putting together a "stupid beginners" box of parts from whatever you have in junk parts? Maybe enough odds and ends to build a simple flyback circuit? Will gladly pay for the stuff, and it would be a good starting point for me I think...
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
I imagine I could probably scrounge up a couple power transistors, a big honkin' heatsink and some magnet wire to go along with that flyback. If you're using a single transistor driver, it doesn't take much more than that. I'll let you know what I find as I dig through the last few boxes this week.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I'd stay away from anything connected to the mains right now. Wait until you shock yourself first. Then you'll do everything in your power to prevent it again.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
You could build a decent HV supply. Use a computer PSU as your power source. They are electrically isolated from the mains power. Often the DC output from two can be put in series for more voltage.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
This flyback driver I'll send you the parts for will run best on about 24vDC. Two SLA batteries, car batteries, or a beefy transformer will work just fine.
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Guys, I really do appreciate the help...I know what I am working on isn't big or exciting, but it's really important to me and I want to learn this stuff the right way. You taking your time to help and advise me on my lowly first steps is very, very cool in my book
I have been reading over the wiki here and the flyback page Grenadier linked, as well as the wiki entry on FBT's...
So, if I understand correctly, what I have here is a FBT that contains a transformer, voltage multiplier, and rectifier built into the unit. Looks like I will need to get it off the board by using a soldering iron to heat up the flux under the board. This unit takes the incoming AC power and converts it to DC (am I close here?)
If I am right on the function of the FBT and it eats AC and outputs DC, I am still trying to figure out how to use this with a DC output from a PC PSU?
It's baby steps for me guys...four days ago, I didn't know any of this...
Here's the board (I have left it slid in the base for ease of handling at the moment). Anyone care to point out the parts on here (other than the FBT) that I can make use of?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Most everything on there can be used for something. A blowtorch works wonders for desoldering en-masse BTW.
Yes spot on. The flyback requires AC, but at a frequency of 60-120khz for a monitor one. The computer PSUs supply power for the driver circuit that turns the DC into high frequency AC.
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things I have laying around...
