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Registered Member #1485
Joined: Thu May 15 2008, 06:29PM
Location:
Posts: 1
Hi, I recently built a audio modulated ignition coil, and am now looking at ways to improve the sound quality and spark length. I am currently using the basic 555/2n2055 circuit, using two 2n3055s in a darlington configuration, this in turn drives two ignition coils in an anti-parallel configuration. The main problem I am having right now is that the audio is covered up by the carrier frequency. Single notes come out ok, and regular audio is low but audible. I am trying to limit myself to parts on hand, but I do have quite a few tl494's and various mosfets laying around. I also need advice on how to protect the current driver from damage.
Registered Member #1132
Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
Ignition coils are never good for audio modulation. As sead before use a flyback
Only way i see to make the ignition coil work for it is to remove the iron core inside the coil or meaby replace it.I dont recomend doing this since its a VERY messy job doing that
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
Yep, you need a transformer capable of much higher frequencies. Pulling a ingition coil out of its can is hard enough, but then you gotta get all the oil off the coil, and get the core out somehow.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well i used a very similar circuit but a few different things. It is a quite high powered flyback driver. I audio modulated it too by using pin 5. I got around 2 to 3 inch flaming arcs. It could go up to 210 watt pulling 4 amps at 50 volts. I used an irfp460 for good performance. Get one, you will not regret it. Buy either one from ebay for around 2 bucks or just buy 20 like i did for 20 buck or something.
Well here is the basic schematic... I used a smaller capacitor(you will have the find by experimenting) and for the pot and resistor between pin 7 and 2 i used a 2.2kohm resistor for maximum duty cycle. I hooked a 12 volt adapter up to pins 1 and 8 accordingly and i connected the flybacks power supply from the negative to the negative on the bread board(the one that the capacitor and pin 1 is connected to) and the positive to the primary on the flyback. The power supply for the flyback is a 50 volt transformer and a bridge rectifier with a 470 uf capacitor for filtering. You can use anywhere from 100uf to 500uf with the same results. This was all made on a breadboard for simplicity. I used a irfp460 mosfet and a 16ohm resistor from the gate to pin 3, but you can use any mosfet or transistor as long as the rated voltage is at least 4 times greater than power supply for flyback and must be mounted on an appropriate sized heatsink with an appropriate value resistor for limiting current from gate(or base for transistors) and they should be rated for 8 amps or more. Hope this will help!
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Ignition Coil Audio Modulation
