When you short-circuit a 9v battery with a ball of steel wool, it burns very quickly. You can get a few strands from the steel wool and get a 9v battery and drive that with a MOSFET. It's simple and cheep.
When you short-circuit a 9v battery with a ball of steel wool, it burns very quickly. You can get a few strands from the steel wool and get a 9v battery and drive that with a MOSFET. It's simple and cheep.