Time Delay Door Alarm

FEATURES:
Power requirement : 9-12VDC.
Consumption : 1.9uA (standby) @ 9VDC, 60mA (working) @ 9VDC.
Duration of delay time before alarm : 10-60 seconds.
The magnetic switch is included in this set.
PCB dimensions : 2.81 x 1.84 in.

CONNECTING POINTS
9VDC point to be connected to power supply.
S1 point to be connected to the magnetic switch.
LED indication of circuit in operation.
Jumper JP1 is used for selecting the mode of circuit operation.
The circuit will operate with time delay when JP1 is connected.
And if JP1 is disconnected, it will operate immediately.
VR1 is used to set the delay time.
VR2 is used to adjust the high tone of buzzer sound.
VR3 is used to adjust the low tone of buzzer sound.