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Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Luke_Duke wrote ...
Ok thanks i have to study for my exam but when its finished Ill be back and solder the Driver together!
But i have to look if ma FBT is DC or AC if its DC i have an Old Pc Powersupply if AC i have to make a Powersupply!
Thanks either, Lukas
AC and DC flybacks are both driven with AC (or actually pulsed DC), when someone talks about AC or DC flybacks it means the output is AC or DC. The driver pulses the DC to the flyback primary, so your computer PSU will be fine. And yes, your flyback is a DC one.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Luke_Duke wrote ...
Ok thanks for you replies first i have to get some 2N3055. And it is cool that i can use my ComputerPSU
Lukas
Actually 2N3055 is a rather poor transistor for the job. Get 2N3773, for example. They've been reported to work well. Also check out to get more information about the driver.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Yeah, right... I knew that someone would joke about that But well, Lukas, if you just want some sparks, 2N3055 is just fine with the improved single transistor flyback driver. I've tried that and I got at least 3cm arcs with a very crappy, non-tuned setup.
But it depends on you, which kind of results are you excepting from it. Also pay attention on the cap across the transistor. It should be a pulse rated one (usually MKP type).
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Luke_Duke wrote ...
I'll think about wich i will use.
But in both schematics there are Symbols called 8t and 4t? What is that?
That is the mechanism to describe the turns of the coils of the feedback & primary upon the core of the flyback. In your schematic you will have two areas to form coils upon the core of the flyback. The lesser turns (4Turns) would be the feedback, the Primary would be larger. This is subject to idiosyncrasies such as the flyback itself, the transistor and the overall design of the driver circuit. Do yourself a favour and stick with something other than a 2N3055 if you're going to use a single transistor design. There ARE some that will SCREAM! and then there's the 2N3055.....:(
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Introducing myself and asking a few questions
