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Registered Member #579
Joined: Mon Mar 12 2007, 09:45AM
Location: Burntwood, Staffs, England
Posts: 46
This is a beautie....... I have built a flyback driver ... one 2n3055 plus two resistors one FB coils and one primary coil
It works well on 5 LOPT, all different sizes
BUT I have blown 5 transistors now and they seem to blow AFTER I have left the driver disconnected from the 12volt battery ?????????
Twice, I have left the circuit over night, battery totally disconnected, and the 2n3055 have blown the next morning ... no start up spark at all
To day I have made another circuit up - worked great ... disconnected the battery .. went to do some work in the garage for 1hour - came back no sparks ... transistor blown
What is going on?
Stored energy I suppose ( thats how lopt work) so how do I prevent it?
Diodes in the battery line ? will that stop the chopping / pulsing ?
diode in the base line ... surely not?~:-(
Any body got a bulk supply of power transistors ;) can I replace the 2n3055 with a mosfet irf 740 ?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
The single 2N3055 driver isn't too reliable, and very inefficient. Upgrade to a better driver. Using a mosfet would not work, that driver needs a transistor.
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Why are my power transistors blowing in my flyback driver ?
