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

[MTG]

There are lots of good regulators in transistor packages. LP5957/LP2954/etc 
... the LP2950ACZ-5.0 being one of my faves.

GB
www.musictechnologiesgroup.com


----- Original Message ----- 
From: "Tom Wiltshire" <tom at electricdruid.net>
To: "Michael Zacherl." <sdiy-mz01 at blauwurf.info>
Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, March 04, 2012 5:41 AM
Subject: Re: [sdiy] Generating +5V gate signals from +3.3V logic


>
> 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.
>
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