Re: How do Atom Computer Ignition modules work?

[debe]

Well my 10, 2SD1071 transistors arrived today. On testing them I find 3 out of the 10 don’t work. The other 7 do work but not aswell as the the original ones I purchased 2 years ago. The diference in the 2 are the flywheel needs to turn a bit faster to get spark. I have also tested them on a Digitec component tester. It came up with some interesting data. Hfe will not be accurate due to B/E shunt resistor, this measures 1.5K ohms, also says there is a C/E protection diode. Hfe 5, Ic test 2.5Ma, B/E 1.12V, Test 4.18Ma. These are certainly very differen to the orig ones. The ones I purchased 2 years ago, Hfe 20597, Ic test 2.5Ma, B/E 1.22V, Test 4.18Ma. On these the tester didn’t say there was any resistor or int diode. And checking B/E there was no resistance reading. BUT these orig transistors work perfectly & you get a good spark just by flicking the flywheel over by hand. One wonders if some of the cheep Ebay ones are out of spec transistors being flogged off.