My expectation is it to give 5v as output (for D RELAY and SP RELAY) for certain number of seconds/minutes soon as it got powered-on. Time interval to be selected using the rotary switch (bottom side).
I created this circuit by taking this. Additional things I added are voltage regular part with AMS1117-5.0 and various resister series selectable using rotary switch combined with 1000uF capacitor.
I tested timer part, excluding voltage regular, on breadboard and worked good. Then created PCB with SMD components (except 1000uF and 22uF capacitors and BS170 MOSFET. Those are through hole ones).
I am using a wall adapter having 8.4v for Vcc.
The problem is the timer is not working at all. It even does not give HIGH when I tested it using multimeter put across OUT pin of 555 and GND.
I am not yet good at electronics and took around one day to build the PCB!
Please help me to identify the problem in this circuit.
Many thanks in advance!