Hello my friends,
Just wanted to tel you about my new ignition system for my Farm Boy hit'n miss engine. I was looking for a suitable coil for it and found this:
http://www.icstation.com/15kv-high-...ule-18650-core-transformer-suite-p-12099.html
This is a very cheap and small coil and it actually works. Paid $5 shipped. It's a module that generate s constant arc, but we just want to use it as a single (or multiple) spark coil so you won't need all the components. Just use the coil and maybe the pcb to hold it. The low voltage side has two windings, but we just use the one with the thickest wires.
I also made up an ignition driver for it. I do electronic development for a living, so I can do such things. It is a buzz ignition, giving a series of sparks and reduces the number of sparks as the rpm increases. It is experimental, but at least it works for the low rpm hit'n miss engine. Haven't tested it on higher rpm engines. The output transistor is a bit overkill (it is for car coils), but it is specially designed for ignition applications and won't brake down. You can use either a hall sensor or points. It is a lot of various hall sensors to chose from, I tested several and found the one in the schematic to be fine. I doesn't work well over 6V, but it generates a strong spark.
So if you can do a little soldering, it is worth a try.
This coil will work fine with just points or another driver too.
Rudy
Just wanted to tel you about my new ignition system for my Farm Boy hit'n miss engine. I was looking for a suitable coil for it and found this:
http://www.icstation.com/15kv-high-...ule-18650-core-transformer-suite-p-12099.html
This is a very cheap and small coil and it actually works. Paid $5 shipped. It's a module that generate s constant arc, but we just want to use it as a single (or multiple) spark coil so you won't need all the components. Just use the coil and maybe the pcb to hold it. The low voltage side has two windings, but we just use the one with the thickest wires.
I also made up an ignition driver for it. I do electronic development for a living, so I can do such things. It is a buzz ignition, giving a series of sparks and reduces the number of sparks as the rpm increases. It is experimental, but at least it works for the low rpm hit'n miss engine. Haven't tested it on higher rpm engines. The output transistor is a bit overkill (it is for car coils), but it is specially designed for ignition applications and won't brake down. You can use either a hall sensor or points. It is a lot of various hall sensors to chose from, I tested several and found the one in the schematic to be fine. I doesn't work well over 6V, but it generates a strong spark.
So if you can do a little soldering, it is worth a try.
This coil will work fine with just points or another driver too.
Rudy
