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

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Antonio
Sat Apr 04 2015, 01:57PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
 		Try to revert both windings. If the transformer has a built-in diode, only one polarity works. The oscillator may be working, but the HV output is blocked by the diode. Don't connect regular meters to this device. If it happens to work, the meter may be immediately destroyed.
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Sat Apr 04 2015, 04:16PM
Registered Member #54664 Joined:
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Posts: 0
Antonio wrote ...

Try to revert both windings. If the transformer has a built-in diode, only one polarity works. The oscillator may be working, but the HV output is blocked by the diode. Don't connect regular meters to this device. If it happens to work, the meter may be immediately destroyed.

Still no sparks and no voltage between the HV cable and the 0 V pin. I don't understand where the problem could be.
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Ash Small
Sat Apr 04 2015, 05:34PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
jaggions wrote ...

Still no sparks and no voltage between the HV cable and the 0 V pin. I don't understand where the problem could be.

Have you tried testing the 2N3055 as I described above?

Something like a brake light bulb or indicator bulb from a car is ideal for this.
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Sat Apr 04 2015, 05:37PM
Registered Member #54664 Joined:
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Posts: 0
Ash Small wrote ...

jaggions wrote ...

Still no sparks and no voltage between the HV cable and the 0 V pin. I don't understand where the problem could be.

Have you tried testing the 2N3055 as I described above?

Something like a brake light bulb or indicator bulb from a car is ideal for this.
I haven't, but I'm pretty sure it works since it becomes very hot.
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Patrick
Sat Apr 04 2015, 06:11PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		Getting hot and working are very different especially with a 2N3055.
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Sat Apr 04 2015, 06:14PM
Registered Member #54664 Joined:
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Patrick wrote ...

Getting hot and working are very different especially with a 2N3055.
Well, I'll check it. Thank you.
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Patrick
Sat Apr 04 2015, 06:46PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		i like the 555 timer, but that may be too advanced at the moment.
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Antonio
Sun Apr 05 2015, 01:27PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
 		If something is too hot to touch, it's too hot, and possibly damaged. It's easy to test a transistor with a ohmmeter, and some even have specific tests for diodes and HFE.
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Sun Apr 05 2015, 01:54PM
Registered Member #54664 Joined:
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Posts: 0
 		I just did a quick test using an ohmmeter, and Emitter results shorted with Collector (with about 5.5 ohms resistance), so I guess it is damaged. But how could I have damaged it? Is it possible that it came already broken when I bought it? I'll buy a new one and I'll be more careful this time.
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mister_rf
Sun Apr 05 2015, 02:53PM
mister_rf Registered Member #4465 Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
 		In order to avoid any damages during preliminary tests, I’ll suggest you to improvise some sort of protection, using power resistors series on the power supply bus. For that purpose you need to have on hand few resistors, let’s say values of 2.2- 4.7 ohms /10W-25W (you may use also any available 12Vdc car headlight bulb). An electrolytic capacitor, large values 1000-2200uF/25V-35V will be required, “to filter” the power supply near to the flyback input. See the attached photo.
This circuit must be used for test purposes only, as the power dissipated in the resistors greatly reducing the output flyback voltage.



1428245279 4465 FT1630 Protection Circuit 1
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