The JFET I use is 2sk170, but it needs to be powered up for 5 minutes before it can start working. I can't find the reason, I have tried many times. If an oscilloscope and a signal generator are used to measure the intact waveform, the bias voltage is 9V, and after a period of use, it will no longer work.
The following is the chart I used the software to measure in the relatively quiet room. Please help me, thank you
The following is the chart I used the software to measure in the relatively quiet room. Please help me, thank you