Time relay based on 555-U1.
Relay reset is by pushbutton B2 and stand-by.
Push B1 once to initiate relay for a defined period.
Time set the relay by C4 capacitor and trimmer Tr1
Can be adjusted in the range 0 to 160 seconds.
LD-LED indicates On/Off position of device.
Power supply: 10~16V/100mA.
Pushbutton ON.
Emergency stop button.