[sdiy] Generating +5V gate signals from +3.3V logic

[Tom Wiltshire]

On 4 Mar 2012, at 12:10, Michael Zacherl. wrote:

> 
> On 4.3.2012, at 12:57 , Tom Wiltshire wrote:
> 
>> Currently I'm thinking that an op-amp is the way to go. Feed a 0-3.3V digital signal in, apply a little gain, get a 0-5V signal out. Run the op-amp on the analog +/-12V rails and consider it as output buffering into the bargain. What do you think?
> 
> Of course an OpAmp would work.
> But since you got just two voltage levels at low frequency you wouldn't draw any advantage over a much cheaper and smaller transistor.
> Michael.

The problem with just a transistor is that I need 0-5V out, not 0-12V. I have to make it into a voltage divider to get the right voltage like Jason suggested.

His solution is pretty simple, but I do wonder about the output impedance. The op-amp solution has an advantage in that it provides a buffered output.

T.