I have a 12V 8A 35mm-stroke solenoid from eBay (similar to this listing) which I am powering with a 12V 20A PSU. I am using two of them for a homemade pinball game. At the moment they are hooked up directly to the PSU via a couple of arcade style buttons.
Problem: They have only just enough power to flip a 19mm steel ball up a 90cm playfield.
After doing a little research, I think I can use a similar circuit to this, using a Teensy board and a P30N06LE 30A 60V mosfet (also have some NDP6020P P-channel if that's better suited?)
I have read a few articles which talk about adding a capacitor and resistor into this circuit to provide more initial "power" and then a lower "hold" current. I think the design for the "hold" part adds C1 and R3.
Where and how can I add another capacitor to give it the initial boost of power and what values should I be using for the passive components please?
Update: I have found this article by Paul Rako / Bob Pease which seems like it could help, although mine are 8A solenoids.