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Registered Member #102
Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
i would definitely recommend the Mazzilli circuit; it is easy, and successful. Flybacks IMO can handle much more current then you might think. I've gotten an estimated 30mA from the potted DC flybacks, and they last for quite some time. When they are over volted, you run the risk of destroying them internally. With that said, I must admit that I have killed many flybacks, but never once with a Mazzilli driver. Flybacks can dependably handle 100-200W usually.
Registered Member #1103
Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
wrote ... Flybacks IMO can handle much more current then you might think. I've gotten an estimated 30mA from the potted DC flybacks, and they last for quite some time.
One must be sure to use current limiting when inputting some serious power into the flyback. I don't care what you say, if you feed it a few hundred watts, and you don't limit the current on the secondary side -- you will destroy your flyback if you run it for any moderate amount of time.
This is the general trend, but keep in mind that all flybacks aren't equal! Your flyback may handle more current better than my flyback.
However, I do agree with you in regards to overvoltage. That is another definite killer of flyback transformers. :(
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Which one? Just the standard 555 -> mosfet version? 100V is a little low but it's enough to make some sparks at low duty cycles. None of the component values are critical so just use what you have. A 555 calculator can be used to find fixed value resistors which give the desired duty cycle and frequency.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
How can i test a 555 timer? i cant even get a simple oscillating circuit, and the chip gets hot sometimes. I tested all the connections with a multimeter.
Im using a 12v 300ma universal adapter.
EDIT: its the first circuit on the page, do ceramic caps work for 555 oscillator?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Yes, ceramic caps work for the 555. Check that you are connecting the power and stuff to the right pins. Here is a quick visualization of the pins from the top. ...______ 1 |...U...| 8 2 |........| 7 3 |........| 6 4 |_____| 5
I think the easiest way to test a 555 to see if it works is to make it flash a LED or two.
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TV Flyback driver
