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Transistor failure

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i m designing a ballast for two fluorecent lamp 36W.using MJE13007,
LUX,I/P Current,wattage,power factor everthing is prefect but not reliable.after 1 hour semicoundector smoke. give me better sugession.
best regard
M YASEEN
sagar_yaseen@yahoo.com
 
M YASEEN SAGAR said:
i m designing a ballast for two fluorecent lamp 36W.using MJE13007,
LUX,I/P Current,wattage,power factor everthing is prefect but not reliable.after 1 hour semicoundector smoke. give me better sugession.
best regard
M YASEEN
sagar_yaseen@yahoo.com
I suggest that you attach your circuit so we can help. It is impossible to make sensible comments without a circuit.

PS. you should have started a new thread for this in the appropriate section, eg. electronics chat.
 
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