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Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
I have seen many articles detailing how to determine the pinout on a flyback with a 24v power supply...some range from "see which pin arcs the best" to specific settings on a multi...
Can this be done with a 9V battery, or a standard PC PSU type 12V power supply?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
A fresh alkaline 9 volt battery can damage some windings on a flyback by sending several amps DC through them. Use an old non alkaline one or a weak one..
Get a compass. Placing it near the core will tell you the polarity of the terminals (winding direction) and interconnection continuity. The compass deflection will also tell you magnetic efficacy of a terminal pair with a given current.
Get a neon tester. With it, you also do this. On pulses, one or the other of the electrodes glow.
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Ok, now I am confused...
the HV Wiki says to use 30V power supply to test a flyback...
"To identify the HV ground pin, a low voltage (~30V) power supply can be connected in series with the HV output lead, and a voltmeter can be used to test each pin individually to determine the ground."
What makes a 30V power supply ok to use, but not a 9V battey? (not being a smart-ass, seriously don't know)
Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
I would guess if they said a power supply it is current limited to around an amp or so. If you short a battery (you are by placing it across a winding which is really just one long wire) it will give as much current as it possibly can. Ever shorted a battery with a small wire? It will heat up and turn red even.
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Aha!
That makes sense...
So when the instuctions say to "test for the best spark" it means to hook the 12+ to the HV output wire and test the pins on the bottom with the ground from the power supply?
Registered Member #2648
Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
I've done this before.
What you do is put a voltage source is series with a DMM on voltmeter. The postive side goes to the HV out suction cup. The negative end is used to prode the Different pins at the bottom. If there is a voltage reading (not 0v, probaly 5v +) then thats the HV return pin.
The reason you need about 20v+ is to over come the voltage drop of the internal diode and have enough current for the DMM to get a reading.
I used a couple 9v batteries i had lying around in series to get about 27v. It worked fine and I found my HV return pin.
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
I did see that article, but the power supply I am going to be using is one I am building from a PC PSU.
I have seen a few references to folks using the +12 and -!2 to get 24V out of these, but from what I read it was not advised at all...would that be ok for testing the flyback pins using the methods on that page?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
You could look up the LOPT's number at HR Diemen and see if they have a data sheet for it, though it is not always easy to determine which of the number groups often found on LOPT is the actual part number.
HR Diemen is the world's number one supplier of replacement LOPTs, and their huge searchable inventory can be accessed either directly or via the Donberg Electronics site.
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testing flyback pinout with a 9V?
