5. Connect the AC12V line of the transformer on the circuit board ( there is no positive or negative electrodes); Tear off the
protective film of the cover; fix the transformer with the circuit board with M3 screws well ( put the transparent spacer on
the circuit board).
6. The red line of the transformer shall connect the power source of 200V; protect the welded power line with heat shrink
tubing.
7. Install the alligator clip.
8. Anode and cathode of power source: output end of the adjustable power supply.
Buzzer end: input the high level buzzer.
Signal output: output square signal, and change the output frequency by adjusting R5.
Logic signal input: The red LED shines with high level inputs; the green LED shines with the low level inputs.
