noniverting transistor amp

[Bill Layer]

Hi Rob, Martin, all,
 
>> I need to take a digital signal (5v) and convert it to 12v..
>> Is this possible to do with 1 transistor amp and maintain phase
>> relations/non-inverting?
>> 
>> It *seems* like every amp I see is inverting.. 
>> I guess maybe a darlington configuration would do this, but thats two
>> trannies..
>> 
>
>Hmm, common emmiter circuits (open collector) can give you any level you
>want (Uce max is the limit), but is inverting. An emitter follower is
>non inverting, but has gain <=1 , so no larger voltage output. Common
>base cicuits may have a too low input impedance.  So: no, there isn't
>such a one tranny circuit. You need two common emmiter invertes in series.
>
>I think so, or am I wrong?

Nope, you're right. 

If you want gain, you must invert. Emitter followeres (or cathode folowers,
as i call them) have a much lower output impedance, but gain is always <=1.


Bill Layer
Sales Technician
<b.layer at vikingelectronics.com>

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