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2-5 sek delay of 12V compressor

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Lars'ern

New Member
Hello!

I am going go bulid in two 12V compressors in my car, and I want a 2-5 sek deley on the start between them.

When the switch (it is a pressureswitch) is operated, relay1 switch on and compressor1 starts, after 2-5sek relay2 switch on and compressor2 starts. When the switch i off, both compressors stops.

I tryed this, but it wount work, whats wrong?
9159-555.jpg


Or do someone got a better way too do this?
I am not all green, it is just too long time since I was doing some electronic


Thanks
 
Last edited:

MikeMl

Well-Known Member
Most Helpful Member
Several issues. The regulator cannot work. It has no headroom. The 555 is not wired as a delay-on-start.

This should work. Compressor wiring not shown. Bypass caps not shown.

I added snubbers around the relays. D2 resets the timing network for a new cycle.
 

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