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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
What exactly do you mean with switching supply? Do you mean it's AC? (What is commonly called a switching power supply doesn't work at 60 Hz.) The circuit needs a DC input voltage of ~12 volt (couple volt more or less doesn't matter, as long as the 555 can take it).
It might just not be building up sufficient current while it's turned on because it was designed for a 10 turn (low inductance) primary.
Potentially a MOSFET killer that circuit when run without pulling an arc ...
Registered Member #4172
Joined: Sat Oct 29 2011, 05:57PM
Location: Narnia
Posts: 27
By "Switching" I mean its PWM. I just assume its switching on and off because of the tingle it gives me when I accidentally touch one of the power output pins.
is your flyback ac or dc because i dont think you should be able to pick up any resistants in the secondary it should be to high (as far as i now) also if you are using one of the built in primarys you will might be better off winding your own because one of the built in primarys is designed for around 100v at the verry least try using the winding with the leest resistants from memory it should be around .2-.4 ohm
edit: dont quot me on anything i just said its been a while sints i have exparimented with such low power circuits flyback circuits LOL
BTW I used an inverting MOSFET driver (such as TPS2811 and many others) itself as the oscillator and MOSFET driver instead of a 555 for a few projects.
TPS2811 has a dual MOSFET directly with 2A drive current (the two gates can be parallel), has a built-in 11.5V regulator that can work with up to 40V input.
You can build a relaxation oscillator by adding 1 resistor and 1 cap. It has hysteresis input so it is just like an inverter with schmitt trigger input except it can drive your MOSFET.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
2.72 mega ohms for the secondary? as an example, assume the wire is 40awg (~.08mm dia), 2.72 mega ohms is like 2.5 million feet of wire (according to my lazy search results )
-is it a dc flyback? if so then the series diode could be giving you the high reading -try a continuity test with a battery and series-ed LED and resistor to see if it really is "good"
If your supply is outputting AC then you need to rectify and smooth it to power your circuit.
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Flyback Driver Issues
