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4hv.org :: Forums :: High Voltage
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Flyback transformer help.

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cowana
Sun Aug 17 2008, 09:56PM Print
cowana Registered Member #1641 Joined: Sun Aug 17 2008, 09:46PM
Location: Wimbledon, UK
Posts: 11
 		Hi all.

This is my first experience with flyback transformers, and I am a bit confused.

I have just removed the pictured one from an iMac, and I want to connect it to an oscillator and make high voltages (for sparks etc).

I have read I can find the high voltage return by seeing which pin at the bottom has infinite resistance to other connections.

However, I have no idea on how to find which are the pins for the drive circuit. What are the red wires?

Thanks,

Andrew
1219010071 1641 FT0 Pict2170

1219010071 1641 FT0 Pict2172

1219010188 1641 FT0 Pict2171
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TheMooseGoesMoo
Sun Aug 17 2008, 10:12PM
TheMooseGoesMoo Registered Member #1576 Joined: Sun Jul 06 2008, 12:48AM
Location:
Posts: 13
 		Wind a new primary coil on the core if possible, and once you have it hooked up to a driver circuit bring the HV line to the bottom of the flyback to find which pin is the HV return.
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Proud Mary
Sun Aug 17 2008, 10:21PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		I have a good number of flyback data sheets, so if you can find the make and model number from the case, there is a chance that I will be able to find the pin outs and other data for you.

In the simpler type of flyback, the primary usually has a resistance of about one ohm, but often primaries have one or more taps, and are configured as auto-transformers - so making sense of them with an ohmmeter is not always easy.
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cowana
Sun Aug 17 2008, 10:22PM
cowana Registered Member #1641 Joined: Sun Aug 17 2008, 09:46PM
Location: Wimbledon, UK
Posts: 11
 		Thanks.

On the subject of datasheets, the label says:

6174Z-1017H
2UJ14

It is made by LG, and F899 is moulded into the top. Tj74 and SJH16 are stamped on the side.

How many turns/what type of wire should I use for my new coil? Also, do you have a driver circuit you can recommend?

How many volts do you think I can get out of this?

many thanks,

Andrew
1219011720 1641 FT52376 Pict2173

1219011720 1641 FT52376 Pict2174
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aonomus
Sun Aug 17 2008, 10:31PM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
 		If you have a variable power supply, set it at about 24-30V and read this guide Link2 (popup warning).

Once you have identified the HV ground pin, read up on different kinds of drivers, there is the basic 2n3055 driver, and the more powerful ZVS driver.

For your first driver, consider: Link2
And for ZVS you really should do some reading and understand that the extra power is a bit more dangerous:
Link2
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cowana
Sun Aug 17 2008, 10:40PM
cowana Registered Member #1641 Joined: Sun Aug 17 2008, 09:46PM
Location: Wimbledon, UK
Posts: 11
 		Thanks! The transformer in that first link seems to look identical to mine, indicating the pinout is the same.

Andrew
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Proud Mary
Sun Aug 17 2008, 11:29PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Andrew, the HR Diemen equivalent of your 6174Z1017H APPLE/IMAC 350 is part number HR 46177.

This flyback is designed to operate at 32kHz, and outputs 30.6kV DC. I have posted the pin out data for you here:


Link2
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cowana
Mon Aug 18 2008, 08:47AM
cowana Registered Member #1641 Joined: Sun Aug 17 2008, 09:46PM
Location: Wimbledon, UK
Posts: 11
 		Thanks Harry.

Does anyone have any ideas on what the two red wires coming out of it could be?

Am I right in saying that you put voltage in between pins 1 and 2, and the high voltage comes out between the HV ouput (the thick wire), and pin 9? Or is it pin 7?

Thanks again,

Andrew
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Steve Conner
Mon Aug 18 2008, 09:00AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		The red wires could be a 1 or 2-turn winding that connects to the power supply, to sync it with the flyback and prevent audible whistles. Or they could just be some winding that they ran out of pins for.
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Dr. Dark Current
Mon Aug 18 2008, 09:20AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		I think one of the red wires is focus, the other may be screen.
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