Latching switch, momentary pulse output when switching on
A simple CMOS 555 timer chip will do the trick for you.  There are many other techniques but this one is simple.  Something like a TLC555 is good up to 18 Vdc and can supply a maximum of 200 mA without damage.

Circuit is dirt simple.  Do note that the capacitor discharge depends on there being a load after the switch to provide a discharge path to ground.







simulate this circuit &ndash; Schematic created using CircuitLab