General Description and circuit
This is an efficient flyback driver for modern cylindrical
rectified television flybacks. Many sites doesn't provide circuits
driving these transformers, they simply say that they are bad.
I don't agree. In fact I built this circuit. I spent a lot of time
for finding resonant frequency (around 15Khz) and duty cycle.
These transformers best work at around 90% duty cycle. You may
notice corona breakdown at terminals and pfffff sound (as well as
the ozone smell) when adjusting the off time trimmer to near
500-300 ohms. Of course it will work for other tipes of flyback as
frequency and duty cycle have a large range.
Frequency range can be increased using multiposition switch for
other values of C3 capacitor ,for example 2 nF for
80KHz-200000KHz, but didn't found flybacks with so high resonant
frequencies, in addition with higher values of c3 , eg 200nF, 2uF
frequency will drop making possible the use of ignition coils, and
rectified power transformers @50Hz to charge high voltage
electrolitic caps at 300-400V). Unfortunately my ignition coil
died because insulation breakdown (too long drawn arcs)...
I was able to power a small (20cm) Spark Gap tesla coil Using
these dc rectified flybacks to charge primary tank capacitor.
The operation is simple
The 555 is wired as an astable and the capacitor is charged only
through the 4,7Kohm trimmer (notice the diode) and discharged only
through the 2.2 Kohm trimmer, making the duty cycle full
adjustable. The square wave is then feed in a totem pole made up
of a 2N3904 and a 2N3906, which are cheap, and easy to find. The
totem pole ensures the gate being charged and discharged very fast
(approx 50nS i think). The IRF840 is a cheap (i found it for
4euros) reliable and powerful power mosfet, it has current
capability of 8 A continuous and 32A pulse, 800V drain source
voltage, protecting internal zener diode. There is a
snubbing network to ensure that voltage spikes are kept low
(unless the insulation of the transformer start to leak)
protecting both transistors and 555 IC. 100 ohm is a compromise
between decay time and voltage spike.
Comments and specifications:
The 100 ohm snubber must me a 5W resistor, or it will burn at long
The led is only for safety purposes
Use a dead man switch (pushbutton) for safety
The power supply must supply at least 2-3 A if you want decent
arcs (20000 KV)
The flyback driven in this way can supply a significant current,
aldough the heart fibrillation starts at 30mA
I recommend caution to avoid painful arc-burns.
The arc is a hot plasma, never operate the circuit in presence of
Charging high voltage capacitors is a serious life threat, so if
you arent unexperienced just draw arcs and no more
This device when rectified generates static voltage that can be a
little annoying.... (or fun, i sprayed with corona
a plastic pen from positive terminal and then i was able to
attract little pieces of paper)
I don't assume any responsibility of the damages or discruptions
dove by this device, to persons or things. Any irresponsable
action would be a serios danger. This is high voltage threat it