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Registered Member #3076
Joined: Fri Aug 06 2010, 07:45PM
Location: San Francisco CA
Posts: 18
Hi all...
I have a built a 555 circuit for a computer monitor flyback and trying to make two things in particular work...
I made a rotor for a an ion-motor demo. It did what I expected only once.
Firstly, there seems to be a capacitor in the flyback. I can hear it hssing when the power is off and sometimes the arc is small then becomes stronger between arcs...
When I boost the voltage of the supply to around 12 VDC there is an arc between pins of the flyback. The arc is between I think of as 'Capacitor pin' and the ground pin.
I am wondering if cutting the non ground pins short and covering in RTV Silicon will help....?
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
If it is indeed the ground a cap pin that is arcing, connect them together if you do not mind not being able to draw an arc and getting a spark instead. Otherwise, you could use RTV, i have used it for ignition coils plenty of times. As for the other pins, you should ground them. Do not short any internal primarys. So, basically, ground every pin on the bottom other than those that would short a winding in your flyback, and other than the capacitor's pin if you do not want a cap on the output. A simple ohmmeter is all you need to figure out which pins are internal secondaries.
Registered Member #3076
Joined: Fri Aug 06 2010, 07:45PM
Location: San Francisco CA
Posts: 18
Thanks Arcstarter...will look at it and report back...
I have been a bit confused about what to ground.
I have my building copper grounding rod in my yard some what close to my work bench in basement. I am thinking about running a wire to this rod for my flyback project and future TC project.
Registered Member #3076
Joined: Fri Aug 06 2010, 07:45PM
Location: San Francisco CA
Posts: 18
I tried a few things and didn't have very good results.
After looking at Arcstarter's suggestions, I decided to cut short all flyback pins except the main ground and put RTV on them.
I also ran a ground wire to my buildings ground spike in my garden. I did this by wrapping three turns of bare wire around the metal conduit which protects the wire inside. The conduit appears to connect to the ground spike as well throught he metal connectors. I attached it with foil tape used for exhaust ducts.
I connected this ground to the FB ground pin. The HV output is on a rotor.
I hit the power switch on my PS and got a small shock and heard a buzzing inside the PS. This seemed very bad to me .... I suspect since the arc couldn't break out anywhere, back emf went to my PS.
I tried to connect the new ground wire from outside, to the PS ground and saw sparks, so I didn't connect it. So far, my PS has been floating with no ground. I thought it would be better to ties off the black terminal to the middle white ground terminal. I am afraid to do so now.
I saw a youtube video where someone put a large tank cap in parallel with their PS to protect it from back emf. I'm not sure I believe that would help. I also considered putting a power diode in the primary circuit. I know that it would not handle a HV kick back, but thought it might fail safe and be better than not having one.
I don't trust my understanding right now and need some advice...
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Flyback circuit questions...
