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[Reply #15 on:]

Why not use a proper mosfet driver IC such as TC4420 or TC4429? These will convert a logic signal from 5v to 12V and have good output drive in both directions.

[Reply #16 on:]

Now that is perfect, exactly what im looking for in terms of size and functionality as well as simplicity
thank you

[Reply #17 on:]

Well, if you're going to go shopping then why not get a logic-level FET?
How much current is the FET supposed to switch, anyway?
At first I thought this was about Arduino and using some IRF-type FETs you had on hand.
Then it turns out it was an about an op-amp (comparator).

[I'm not "annoyed", just asking questions.]

[Reply #18 on:]

I am shopping around still, there is a 328p involved but its too busy to do the job of the comparator, I already decided on the mosfets for this project and bought those,(4 for an hbridge and one to turn the whole thing off entirely separate )
its more for incorporating into the design for my much larger project, I just was interested in finding the best wayfor my needs, I have 5v and 12v readily accessible I just didn't know the best(simplest) way to do it, using a dedicated driver that can be controlled from logic makes sense I just didn't think of even looking for something like that, I was first thinking of a non discrete way, but this definetly fits perfect

[Reply #19 on:]

If the signal to be amplified is AC only, then a transformer is a simple way to level shift, but won't give power-amplification.

[Reply #20 on:]

I understand this post is old but for less than $5 digikey has exactly what you need
http://www.digikey.com/product-detail/en/VBT1-S5-S12-SMT-TR/102-1398-1-ND/989924
cheers