Producing a double pulse

Yes,  I am new here.

I have used the search function for "double pulse" and browsed the results found there as well as much of the general information.  (Boy  there is a lot of good stuff on these pages!)  but...

I was not able to find a circut to generate a double pulse from a single pulse door unlock output from the  receiver . (APS25kb).

Can it be done with relays? or do we need something like a 556 timer IC?  

If it's been covered,  Please point me in the right direction

Thanks  CalG

unlock the doors

use a 452T pulse generator from DEI

I have tried to get the AS9631 unit for the APS25kb but have had no satisfaction from "Let's Go Digital" via e-commerce. ( can not give that outfit a good review.)

I will look for the Dei 452T

I tried the relay scheme this weekend on the bench.  I only had a 830 micro farad capacitor in my junk box, and did not get a true double pulse. (-)  The relay did click a bit though, so it may work.  Only a negative double pulse will work for this application (audi).

Regards

CalG