Electronic – Why does this circuit oscillate despite a short


I was following a tutorial online and found the following schematic:enter image description here

Here, there seems to be a base-emitter (and base-collector) short hence bypassing the transistor completely. I still constructed the circuit and to my surprise it does oscillate (it induces aa 10mA current in a secondary coil placed nearby). Why is this?

Edit: I forgot to mention that the secondary coil also has a potential difference of 3 volts. This current remains as long as the circuit I'd connected to a power source

Best Answer

It looks like something was erased in the area containing the short. Perhaps it was another resistor to form a DC biasing circuit with R1.

Are you sure your secondary coil isn't picking up 50 Hz or 60 Hz interference from the mains?