Recent content by oldguy

wow. thanks very much-that's phenomenally helpful. I'll dig in and see if I can put this together. I really appreciate your time.

light_bulb: Thanks so much for the prompt response--it sounds like its very do-able but I'm strictly an amateur as far as real-world applications--would you mind taking a minute and breaking it down for me (or point me at a resource for understanding your response). don't know 555 or bjts and...

Its been 30 years since my last Physics course so while I have the basic concepts I'm uncertain how to solve my current problem: I need to operate a pair of 12V solenoids (.5 seated amps, 4 watts each) with a periodic on/off cycle that gently ramps to full voltage (over about .5 to 1 sec) and...