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need help to improve schematic to reduce triac failure

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neebee

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Hi,
pls. help me out to improve this schematic as triac gets failed some times and i am unable to find what exactly the problem in the circuit and how it can be made reliable.


Chg Drive: 1.5 V 90micro sec. trigger pulse

L1: 100 micro henry

R14: not in circuit
thanks in advance.
 

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