Hi. i replaced the TL494 chip and i still had the same problem. I tried replacing the powersource connected to the flyback. BINGO! Not enough amps. I had 2 6v running in series. I now have a 9v 3amp DC power source running it instead of batteries. i am now able to pull a nick thick 2cm spark off it. The music has also gotten considerably louder. Try changing your IC chip and replacing your power source
yeah disconected flyback and put a speaker instead and music was really ..really faint with a crikling noise(frequency the ic is putting out). I know amps isnt a problem, so just leads to ic then i suppose....but then how come i can still hear high pitched whine when i change potentiometer for ic frequency???
using laptop battery..12volts at +5amps. I just purchased 5pack of tl494 chips of ebay for 6.95 usd or $10austrlian for me, Ebays pretty cheap got 10pack of irf450 mosfets for $5, go there if you need spares.
Thinking about adding a gate driver to the circuit to make it more relaiable and stable. Take away the heating and blowing of mosfets/chips
Please add a gate driver, you'll get better rise and fall times...
I would advice, the cheepest solution, to put a bd139 and a bc140, it is enuf for driving a single mosfet.... and for more mosfet's you'd need a stronger driver.... like those ucc's
put a 4,7 Ohm resistor, with a anti parallel diode , to the gate,, so, you'll get better fall time, and that would be a big improvement in your circuit
Have you found/fixed the problem?
exactly whats happening to mine. I believe it is the tl494 ic..i think replacing it will fix the problem
spitso 2 years ago
Hi. i replaced the TL494 chip and i still had the same problem. I tried replacing the powersource connected to the flyback. BINGO! Not enough amps. I had 2 6v running in series. I now have a 9v 3amp DC power source running it instead of batteries. i am now able to pull a nick thick 2cm spark off it. The music has also gotten considerably louder. Try changing your IC chip and replacing your power source
fatboyslim27 2 years ago
yeah disconected flyback and put a speaker instead and music was really ..really faint with a crikling noise(frequency the ic is putting out). I know amps isnt a problem, so just leads to ic then i suppose....but then how come i can still hear high pitched whine when i change potentiometer for ic frequency???
spitso 2 years ago
How many volts and amps are you putting through this?
fatboyslim27 2 years ago
using laptop battery..12volts at +5amps. I just purchased 5pack of tl494 chips of ebay for 6.95 usd or $10austrlian for me, Ebays pretty cheap got 10pack of irf450 mosfets for $5, go there if you need spares.
Thinking about adding a gate driver to the circuit to make it more relaiable and stable. Take away the heating and blowing of mosfets/chips
spitso 2 years ago
lmao!!
greasyredneck 2 years ago
Hy,
Please add a gate driver, you'll get better rise and fall times...
I would advice, the cheepest solution, to put a bd139 and a bc140, it is enuf for driving a single mosfet.... and for more mosfet's you'd need a stronger driver.... like those ucc's
put a 4,7 Ohm resistor, with a anti parallel diode , to the gate,, so, you'll get better fall time, and that would be a big improvement in your circuit
by
izidor7 2 years ago