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@Tandy, I follow the circuit you provided at http://www.learnabout-electronics.org/Oscillators/osc45.phpBut sadly isn't working, the buzzer starts right away and doesn't stop, you can also feel some hiccups in the sound, so the 555 is working. Also, pressing the trigger generates a small hiccup too.... I have already checked it a dozen times... maybe I'm missing something really stupid... can you spot any error?Thanks.-
Thanks again for your patience Hero.Moments ago my mechanic told me to look on ebay for "delay circuits", so I did and buy some of these http://www.ebay.com/itm/DC-12V-Delay-relay-shield-NE555-Timer-Switch-Adjustable-Module-0-to-10-Second-/161330097657?hash=item259005edf9:g:avMAAOSwbYZXdzac and these http://www.ebay.com/itm/172160616173?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT as they will do the job nicely.I now do believe I can make it work following your diagram, but then the problem will be quantity.