This meant that the coil was actually energised most of the time, through what was known as a "ballast resistor" to limit the current to something reasonable. What you think about the parts and the circuit? Thank you for any suggestion.Īs I recall from my motorcycle repair days ('73 Triumph Trident, among others) the cam actuated "points" were normally closed, opening only at the exact time the spark is called for. It is actually a PNP transistor in switching mode circuit, but actually that is what we search for actually. ![]() The C1, R3 and D1A are for protecting the Q2 from HV spikes which would maybe produced by the ignition coil when it is de-energised. The LED1 represents the ignition coil in the circuit simulator software for now and it will be replaced with the ign. S1 is the mechanical circuit breaker which should for now trigger the Q2 transistor and no more the ignition coil. A short description of the circuit: The whole system is working on a U max=14.7V = battery charging voltage. Here is a simple design I come up with, theoretically it should work but I'm not sure practically does it will last and do the job. It is a 150ccm engine with one ignition coil and one spark plug but with some sort of mechanical triggered ignition coil mechanics. ![]() ![]() Hi! A friend of mine asked me to make some sort of transistor controlled ignition coil driver for his moped.
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