Hello,
This should be a multivibrator circuit that I tried to download directly from a PCB board (it is very likely to have been downloaded incorrectly ). The reason i think so is that in transient mode there are no generated impulses-only constant value of DC voltage is displayed on the output of the electrical circuit, which is the collector ot the NPN transistor. On the load,there must be a piezoelectric crystal, but since I'm just testing whether it will switch the output, I haven't put a similar one. Also I am asking myself why is there a positive voltage of 700 mV at the base of the PNP transistor (where does it come from?) and a next question follows: from where the capacitor gets these 700 mV, i mean how does it charge, and discharge? This capacitor cannot form a positive feedback to switch these two transistors. I can also add that the PNP transistor cannot turn on with positive voltage..i am so confused