I have a relay that turns a switch on for an instant and then switches it off.But i want the switch to remain on for some time (about 40 seconds) and then switch off.I searched online and i got some hits but I am not sure what the devices do.What i figure is that the delay is only in the circuit i.e; the switch will turn on after a delay and then switch off.I have posted the links below.Is there any other type of circuit for device available this?Please let me know.
https://www.bakatronics.com/shop/item.aspx?itemid=466
**broken link removed**
https://www.bakatronics.com/shop/item.aspx?itemid=447
https://www.bakatronics.com/shop/category.aspx?catid=151&page=2&sortby=
also i found a circuit,but i haven't tried it yet
**broken link removed**
https://www.bakatronics.com/shop/item.aspx?itemid=466
**broken link removed**
https://www.bakatronics.com/shop/item.aspx?itemid=447
https://www.bakatronics.com/shop/category.aspx?catid=151&page=2&sortby=
also i found a circuit,but i haven't tried it yet
**broken link removed**