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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Don't know why the driver I have just fails, gets warm on 12v input...
Here the 555 in 13vdc, and 45volts into the FET, limited by the primary of a ignition coil, as it's the only thing that doesn't melt, because of oil in it.
Sorry about the quality couldn't focus webcam...
Very little arcs here about 3.4cm very low current... :(
Why so fail?
Here is a schematic...
Zener and UF4007 removed. Could get more power by removing the limiting ignition coil, but I have only 1 555 timer, so I could also replace MOSFET for a better one like IRFP250n or even IRF640n... tried 250n, but it was a lower voltage arc....
I've seen a 555 on 30v 4a and it was very good power, I want higher voltage, not current, I'm also using the flyback's internal primary, which seems to give more power.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I know how the circuit works.
13VDC to - and + to 555 input, and 45vdc + to vcc+ on the output end of the driver, and - of 45vdc to - of the 555 input...
I think I'm doing it right, maybe I'm wrong?
Ever since I removed the TVS, the circuit is just bad... on 19vdc I could get very big arcs and with 45vdc input big arcs but not as big as 19vdc input when I got the driver...
So what's wrong, is there anything in the circuit that needs replacing because Sulaiman, did use this circuit on 12vdc 1a...
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
disconnect your 45v supply, reconnect your 19v supply and tell me how well the 19v circuit works...do you still get the High energy output like before?
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
19vdc is terrible, it shuts off as it pulls to much current. MOSFET needs a fan...
Sorry about this schematic, but this is how I power the circuit.
Instead of 19vdc I'm using 45vdc for more power, the 19vdc is a laptop SMPS, 19v 4a.
The 45vdc is a CB radio supply, I modified, for just the transformer and bridge and smoothing caps, and it output 45vdc and 20a shortcircuit, then the voltage drops to 25v...
Thanks for helping.
If I take out the ignition coil, then I'll probably blow it up.
Maybe an IRFP250N would be better...
Before I used 5v for the 555, but the gate threshhold is 10v I think, so now I use 13v to turn the gate on all the way.
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Best arc I can get with 555
