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I tried another pcb and the same waveform appeared on the oscilloscope .
R5=4k7 and C3=1nF.
Ok, the voltage on the led is 2.25V.(7-2.25)/10k=0.475mAThe total maximum current = 1.5mA (the current throug R7)+0.475 (current through led)=1.945mA.What tests should I do after modifying the R7 value ?
Do I need to do any other test, using different load resistance, to check the stability ?