I'm a little embarassed to say I don't have a schematic. I mainly work from those generic ones on the back of the cards they mount Radio Shack parts on.
I'll go buy the MOSFET today. In the next couple of days I guess I'll solder the power connections to the source and drain, and finish wiring up the 555.
How easy is it to mess up the MOSFET with stray static discharges? Do I need a wrist grounding strap?
Thank you, one in all, for taking out the time to help. I appreciate it very much.
The load, BTW, is an electrolytic wastewater treatment device. I hope that the use of pulsed current will encourage desired reactions, like metal removal, and decrease unwanted side reactions, mainly electrolysis of the water.