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My FET, inductors or diode got red hot. What is wrong ?

April 26, 2017diode FET GOT hot inductors red wrong

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My FET, inductors or diode got red hot. What is wrong ?

1 Answer

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You connected the pulser with reversed polarities, FET is in backwards, the gate is isolated (not connected to pin 3 of the 555). FET is shorted. Diode is in backwards. Wrong combination of timing components (R1, R2, C2) leading to a Pulse Repitition Frequency (PRF) that is too high or a pulse width (pin 3 output) that is too long. Bad C1 will cause ringing in the pulse when it is supposed to shut the FET off.