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smps zener make me crazy

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hiii,
i have a cheap smps running by one transistor. and i want to increase voltage .
this transistor controlled by zener diod. but when i replace the original diod with another one. the led power in circuit make flashing.
i think it flashing because i changed the zener value. when i replace the original diod with another zener as same original diod value power led is flashing . and it make me crazy :cry:
 

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