16-02-2018, 05:04 PM
I agree about a C-E diode not working.
There may be a diode that was not spotted when the circuit was reverse engineered. It would go from B to C to help the B-C junction to charge the coil.
At about 1.5 volts the transistor would shunt the coil collapsing the field and producing the spark. Perhaps the coil resistance is all right.
If this is so the coil would be charged at about 2 amps before it gets shunted by the transistor.
With the electronic bit removed connect a brake light bulb and 12 volt battery in series with the coil and then short the coil and see if you get a spark.
If this works then the circuit can be reproduced to get it going again.
There may be a diode that was not spotted when the circuit was reverse engineered. It would go from B to C to help the B-C junction to charge the coil.
At about 1.5 volts the transistor would shunt the coil collapsing the field and producing the spark. Perhaps the coil resistance is all right.
If this is so the coil would be charged at about 2 amps before it gets shunted by the transistor.
With the electronic bit removed connect a brake light bulb and 12 volt battery in series with the coil and then short the coil and see if you get a spark.
If this works then the circuit can be reproduced to get it going again.
