I am not an expert at electronics.I am trying to build a pulse induction metal detector. I have this circuit
from that Book
I am using it with stm 32 blue pill but I have to stabilize the 9v supply to make works perfectly so i tried to use a 9v 1A adapter instead of 9V battery The transistor gets very hot and produce sound like beeps and after a while it is about to burn.I investigate the circuit on oscilloscope it produces a similar output on both cases adapter and 9v battery.
I thought it is a problem of logic level(between stm32 and PIC) so i tried to convert the 3.3V to 5V using open drain but it produces the same unpredictable performace.
finally it do the same with 2*3.7 li-ion battery What should i do to overcome this problem to be able to drive the circuit with 3*3.7 through 9V regulator to stabilize the circuit.Thanks.