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Flyback issues... I THINK

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twist2b

Wed Apr 22 2009, 11:44PM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
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Posts: 117

Ok, awesome thanks!!!

I will experiment MORE :)

if you don't HAVE to ground it, then thats good, but I think I will after my experimenting just too see if that gives better results for the singing. :)

Antonio

Thu Apr 23 2009, 12:07AM

Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644

The sizzling is corona. Look in the dark and you will see brushes of violet light coming from the hv terminal. Searching the ground pin by making it spark to the hv terminal works, but may destroy the insulation of the other windings if you try the wrong pin... The ground pin is the one in the arc of pins below that doesn't show a low resistance to one or more of the others.

twist2b

Thu Apr 23 2009, 12:19AM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

Antonio wrote ...

The sizzling is corona. Look in the dark and you will see brushes of violet light coming from the hv terminal. Searching the ground pin by making it spark to the hv terminal works, but may destroy the insulation of the other windings if you try the wrong pin... The ground pin is the one in the arc of pins below that doesn't show a low resistance to one or more of the others.

Oh.... Now you got me scared to check for it :P
I am going to be safe for NOW.... but yeah, if its better for it, I will deff head towards that goal.

One last question,
The audio modulation part.... if I wanted to put an IPOD connected to it, would that be safe??? Most have said that its not smart, cause you never know.... but is there any safety precaution I do so that I can use an iPod instead of a cd player?

Myke

Thu Apr 23 2009, 12:25AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

If you are afraid of high voltage signals coming back to the music player, you can stick two signal diodes in antiparallel in parallel with the input. So you have two diodes going both ways across the input. The voltage output of the music player should be low enough so that the diodes don't have much current flowing through them. If you are unsure, you could connect the output to a oscilloscope (if you have one) and look at the peak voltages.

twist2b

Thu Apr 23 2009, 12:52AM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

Excuse the fact that I have NEVER worked with any audio before....

This is the jack I have.... so, do I only need to put 2 wires to the jack... one from the input and one to the ground.... So I put them on pin 6 and 7????
Myke, I have an idea of what your saying, but can you show me a schematic if you don't mind? I have never built a circuit like that before.

Antonio

Thu Apr 23 2009, 01:33PM

Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644

Pin 3 is ground. 6 and 7 are the two channels of the stereo system. Choose one.
For safety, ground the circuit. You don't want a random voltage of several kV between you and the IPOD.

twist2b

Thu Apr 23 2009, 03:54PM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

Thanks Antonio (and everyone)
So the jack already has a natural safety feature.... I am comforted.

I got arc at pins 8 and 11.
Pin 8, that makes sense!
THere is no information on that schematic about pin 11, but obviously pin 11 is where I should ground, since its connected to the HV via a capacitor.

Thanks for ALL the help guys, I had alot of fun with this project!

twist2b

Sat May 02 2009, 02:50AM

Registered Member #2086 Joined: Tue Apr 21 2009, 02:33AM
Location:
Posts: 117

New issue guys -_-
So it was running REALLY well for a little while, been getting large arcs (well, like 1-inch about, more or less)

Recently it died :o

no arcs!!!! after tons of troubleshooting I found a bad resistor, replaced it only to find that I only get 1/4 of an inch arc, and the audio SUCKS. I can't really hear the music.

Do these symptoms lead you to any suggestions???

Argh, just want this thing to work dammit :P

Proud Mary

Sat May 02 2009, 05:27AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

twist2b wrote ...

New issue guys -_-
So it was running REALLY well for a little while, been getting large arcs (well, like 1-inch about, more or less)

Recently it died :o

no arcs!!!! after tons of troubleshooting I found a bad resistor, replaced it only to find that I only get 1/4 of an inch arc, and the audio SUCKS. I can't really hear the music.

Do these symptoms lead you to any suggestions???

Argh, just want this thing to work dammit :P

At the expense of stating the obvious, flybacks aren't designed for producing arcs, and I expect you have overloaded it, and something has failed.

Antonio

Sat May 02 2009, 03:57PM

Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644

Never let the system generate arcs for more than a few seconds without strong current limitarion. Make a series association of several large (3W) 1MOhm resistors and put it in series with the arc.
Or better, add a circuit to control the average arc current.

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