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Holy... ok.... so you finally got it right for the H-bridge... but you have filter capacitors in series for a dc voltage? For serious? HAHAHAHA, SAAAME principle as for the H-bridge, you want ONE .1uF cap in parallel CLOSE to the chip... what you are doing is effectively producing a open circuit to the chips (no voltage).
EDIT - I'll say it again, essentially you just want to make sure that get a continuous 12V to the chip, so if you put a cap in parrallel close to the chip if there are any tiny voltage spikes for various reasons, that cap (RESISTANCE TO the CHANGE in VOLTAGE) will be like, "no sir" and filter that added voltage from 12V back to the source.... does that make sense?
EDIT2 - also you don't need any more than say 30V caps for the chips... you are on the control side and at most 20V MAYBE will go through them...
EDIT3 - why negative 5 volts and not ground to a chip that has ground pins? Your schematic was increasingly improving and than I feel like you went to another universe where the laws of physics just changed dramatically. LOL, I'm sorry, I don't mean to come across as mad I'm just confused what happened!!! Stick with 12V to the rails of all the pins.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
X_X... I will get to modifying the schematic later. And I did not connect it to ground cause I have only one ground. The tesla coil will be connected to that. So I figured negative 12 volts would replace ground with out problems. And I know I would need 20V at most. But I just like to make sure there is space if anything goes wrong But tell me. Are the values or R1 R2 and C1 correct?
Bleeder resistors seem fine to me. if you run into trouble (hopefully you have an oscilloscope) if you see abnormalities from the output of the mosfet drivers (you can check there) than increase the resistance values a tad... I can't find which one is C1? are you talking about C7?
Edit - so your secondary coil with so much output should NOT be connected to DC ground but fed DIRECTLY back to a mains ground... as that is fed to mother earth. Everything on the primary side or "control side" can go to DC ground.
I read the PDF on the chip, seems that capacitor is just to help with filtering and such... it says:
C1 should be greater than 100pF if the voltage powering the chip is greater than or equal to 5V BUUUT C1 should just be greater than or equal to 50pF if the voltage is greater than or equal to 10V so you are fine but why not just switch that bad boy out with a 100pF eh? That way if someone decides to power their system with 5V it's not going to be an issue.
Also, if you dial down the pot all the way and you get a signal it would probably be best to eventually just replace it with a standard resistor for your final schematic because I am guessing the more resistance you put on the dial you could actually lock into a higher frequency from the coil which will yield crappier results... think of the secondary like a tuning fork... it rings very well, but if it's in the "key of C" like music, you can hit that c note again at a higher frequency but the amplitude will change. Does that make sense?
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