[Test-Equipment] Need to shift pulse up 5V

[Barry]

If I understand this correctly, when the clock is at -5V, the collector is at +5V and when the clock it at 0V, then the collector is at 0V.  Is that correct?  If so, then doesn't that invert my clock signal?  If I'm thinking about it correctly (and I may be wrong), the comparator can be set to do either - depending on which way the inputs are connected, correct?

I like the single transistor idea but if it inverts the signal, I'm not sure that's what I'm needing.

Thanks!
Barry - N4BUQ

----- Original Message -----
> From: "Mike Manes" <mrmanes at gmail.com>
> To: "Discussion of Electronic Test Equipment" <test-equipment at mailman.qth.net>
> Sent: Friday, May 1, 2015 10:44:46 AM
> Subject: Re: [Test-Equipment] Need to shift pulse up 5V
> 
> The common-base NPN (2N3904, e.g.) previously suggested by ?? is truly
> elegant.  Ground the base, run a 4.7K from the emitter to the -5V
> clock and run another 4.7K from the collector to a +5V bus.  Take the
> 0 to +5 clock from the collector.  Two bits and 3 parts - how much
> simpler can ya get?
> 73 de Mike W5VSI
> 
> On 5/1/15 8:43, Barry wrote:
> > Ah yes - a comparator.  I like that idea and I should have thought of it.
> > I wish Radio Shack had an equivalent for the 311.
> >
> > Thanks!
> > Barry - N4BUQ
> >
> > ----- Original Message -----
> >> From: "Barry" <n4buq at knology.net>
> >> To: "Test Equipment" <test-equipment at mailman.qth.net>
> >> Sent: Thursday, April 30, 2015 11:37:27 PM
> >> Subject: [Test-Equipment] Need to shift pulse up 5V
> >>
> >> I have a situation where a clock signal is pulsed to 0V from a normally
> >> -5V
> >> signal level.  I would like to have that same waveform shifted +5V (e.g.
> >> the
> >> pulse would go from 0V to +5V instead of -5V to 0V).
> >>
> >> Is there a convenient way to do this?  I thought this might be a somewhat
> >> common problem and there would be a selection of "level shifting" chips
> >> but
> >> I'm not finding that to be true.  I assume that if there's no dedicated IC
> >> for this kind of thing, then perhaps a simple single transistor circuit
> >> might do the trick but thought I'd ask first if there are any
> >> off-the-shelf
> >> "standard" solutions to this.
> >>
> >> Thanks,
> >> Barry - N4BUQ
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