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

[Tom Wiltshire]

On 5 Mar 2012, at 09:44, Andre Majorel wrote:

> On 2012-03-04 11:27 +0000, Tom Wiltshire wrote:
> 
>> I'm running a 3.3V dsPIC and I want to generate 0-5V gate
>> outputs from it. I've got a 3.3V supply for the uP, and a
>> +/-12V for the op-amps, but no +5V supply.
> 
> No idea but I'll seize the occasion to encourage you to use
> whatever it takes to make the output voltage stiff and well-
> defined.
> 
> Gate outputs make good modulation sources for VCOs etc. It's
> nice to be able to dial in a minor third and not have to redo it
> after switching to another gate output or multing the gate to
> another input. Which the usual 1 k resistor in series with the
> op amp output prevents, BTW.
> 

Ok, so what do you do for gate outputs then, Andre?

The schematic I'd got was exactly what you describe - Op-amp, bit of gain, 1K resistor in series with the output.

But I'm open to better ideas.

Thanks,
Tom