5 volt trigger step up to trigger AND gate CMOS on 14v rail.

[DaveHardy]

I  am looking for a really really simple way to do this.  I don't have much space and would ideally like to do it with one TO-92 component and maybe 2 resistors.  The only thing that I can think of is a 2n3904 and 2n3906 schmitt trigger thingy.  Does anyone have a better idea?

[Strada916]

Simple standard transistor buffer. BCxxx?

[DaveHardy]

Simple standard transistor buffer. BCxxx?

One transistor will reverse the phase.

[Strada916]

Put the input on C and put a 10k to ground. So the input is on the transitor side of the 10k then 1k E resistor done no inverted siganal. Have not tried it but should work.

[TerminalJack505]

The best that I can think of is to use so-called digital transistors (aka pre-biased transistors.)  These have the resistors built-in which will save you some board space.

For through-hole you'll need two of these, an NPN (for example) and a PNP (for example), and a pull-down resistor on the PNP's collector.   If you go SMT then you can get the NPN and PNP in one package (for example.)  You will still need a pull-down on the PNP's output.

[David_AVD]

I'm pretty sure I've seen single buffer chips with 5V in compatibility and higher (12V for example) Vdd.

[DaveHardy]

Thanks for the responses guys. 

[Neato3000]

I don't know if you have the space, but a 555 timer might do the trick. If you run it on the 14v rail, and then set the threshold and trigger pins to ground, you can use your 5v trigger on the reset pin of the 555 timer to get 14v on the output pin with out any other components. Except maybe a filter cap to keep the power input smooth. Then again I'm just a big fan of 555 timers, ha ha. Hope this helps!