Need help with a simple amplifier

[tinbender59]

Hello All;
I am working on a circuite to step up a 5 vdc digital signal out put to a 12vdc signal for an input into an automotive ECU, there is not the need for any significant amperage, voltage potential is more what the ECU is looking for. I have found an RF transistor that is clasified as 12vdc, at 27Mhz, I only need 10Khz absolute max freq. I know that I will need a pull down resistor on the output. but it has been a long time since my last attempt to design. lol all I need is as simple and as few components as possable, since it is in an automotive application. any help would be appreciated.

 

[kam1787]

not important that its RF, but the VCE is only 12V?!

you would need 2 transistors in common-emitter configuration

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[albbg]

I suppose ECU has an high input impedance.

You can use just a single transistor if you can reverse the signal via software. Probably a good choice is to use a mosfet (f.i. BSS123).
Otherwise you could use two cascaded mosfets.

Also you can consider to use a rail-to-rail op-amp (little bit more expensive), like LMC7401.