I am built a simple device but it is causing an initial "jitter" when I turn it on and off.

I need to build something to open the circuit for 1/2 second when turned on then close the circuit. Same for when I turn it off, open the circuit for 1/2 second then close.

I do not think a 555 timer will work here but if it will please tell me how. The best design I can come up with is two DPDT relays, one delayed by a RC circuit.

Any advice is appreciated.

Please see my attached pictures.

Thank you.
PS this is my first post and I am new to building PCB's.

 

Welcome to AAC!

I am built a simple device but it is causing an initial "jitter" when I turn it on and off.

What do you mean by "jitter"?

I need to build something to open the circuit for 1/2 second when turned on then close the circuit. Same for when I turn it off, open the circuit for 1/2 second then close.

Draw a block diagram showing what power is available after the circuit is turned off.

I'm not even going to try to read your schematic. A well drawn schematic will convey function at a glance. You're schematic has many wire crossings, unnecessary jogs, and inconsistent use of connection dots.

 

OK I am working on a better drawing now.

The "jitter" is the power being sent through a wire when I flip the switch. This comes from a ECU trying to do what it normally does but once it reads the resistance it cuts the power to that wire. So disconnecting that wire for 1/2 a second fixes this issue.

 

I hope this drawing allows you to understand what I am trying to do.