Best Push Button Replacement

[Chet T16]

Any suggestions on what would be the best way to implement replacing a push button with something controlled by a micro? Is there something that will act exactly like a small relay but opto-isolated and solid state? I'm thinking of a universal solution that i can just connect up to any device i have here and not worry about polarity or what floating voltages there is.

[pinkysbrein]

What's the point in saving 1 minute of thought put into using the right tool for the job, whether it be a FET, a relay or a solid state relay and doing the polarity right? You only have to design it once.

Guess you're thinking mostly of solid state relays which can switch both AC and DC, just go to digikey and search for solid state relays with output type AC, DC.

[Chet T16]

It's not about saving the time. It's about being able to have a few of these modules ready to be stuck into different things and knowing that they'll 'just work' regardless of how the button operates

[Jon86]

I think you just answered your own question, opto-isolated? An opto-isolator maybe? Unless you need larger currents...

[SeanB]

High voltage opto FET driver, High voltage MOSFET and a bridge rectifier in front of it made from Shottky diodes will probably cover most applications. For signal applications the opto fet driver and a lower voltage FET will do without the bridge rectifier, but will be polarity sensitive. If you need the high voltage without the diode block 2 opto fet drivers and 2 high voltage MOSFET devices connected in series with the sources commoned will work.