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'[OT] Searching for circuits'
2005\12\17@150754 by

I'm trying to figure out how to look for a certain circuit (using
Google) and cannot quite seem to come up with a search phrase that gets
any meaningful hits.

The particular circuit I want would take as input a wave (probably a
sine wave, but it could also be a square wave or triangular wave) which
might vary in strength from a few millivolts or so up to a few volts.
The circuit would output a square wave of about 5 volts.

I think there are some "words of art" to use in describing such a
circuit, but don't remember (if I ever knew) what they are.  Can anyone
help?  (A useful circuit would be nice, also, but I'd still like to know
what to call it. :-)

Thanks,
Bill
Comparitor.

Bill Kuncicky wrote:

{Quote hidden}

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Bill Kuncicky wrote:
> The particular circuit I want would take as input a wave (probably a
> sine wave, but it could also be a square wave or triangular wave) which
> might vary in strength from a few millivolts or so up to a few volts.
> The circuit would output a square wave of about 5 volts.

Feed the signal into the + input of a comparator and a low pass filtered
version into the - input.  The output will be either high or low, depending
on whether the input is above or below its average value.  For extra credit,
you can feed a little bit of the output back into the + input to get
hysteresis.

> I think there are some "words of art" to use in describing such a
> circuit, but don't remember (if I ever knew) what they are.

Try "discriminator" and "comparator" is also relevant.

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> > I think there are some "words of art" to use in describing such a
> > circuit, but don't remember (if I ever knew) what they are.
>
> Try "discriminator" and "comparator" is also relevant.

"data slicer" ?

On Dec 17, 2005, at 1:06 PM, David Van Horn wrote:

>>> I think there are some "words of art" to use in describing such a
>>> circuit, but don't remember (if I ever knew) what they are.
>>>

"Schmitt trigger"  (for suitably small ranges of input voltage)?

BillW

>(A useful circuit would be nice, also, but I'd still like to know
>what to call it. :-)

i'd call it ...Fred!, but seriously, look up the signetics NE565 Phase-locked loop I.C.
it will lock on to an incoming frequency and give
a squarewave output of around 4.5v (5v max.)
you would need some form of amplifier/limiting circuit
ahead of it (automatic gain control plus diode 'clipping'?)
theres nothing like the smell of freshly blown transistors in the morning ;-)

Hi Bill,

I've come across a couple input circuits which claim pretty decent sensitivity while searching for and studying Frequency Counter circuits on the net...

Happy Holidays...  Regards, Mike

--
Sent from the MicroControllers - PIC forum at Nabble.com:
www.nabble.com/-OT-Searching-for-circuits-t762418.html#a1993112
Mike, K8LH (sent by Nabble.com) wrote:
> Hi Bill,
>
> I've come across a couple input circuits which claim pretty decent sensitivity while searching for and studying Frequency Counter circuits on the net...
>
> Happy Holidays...  Regards, Mike
>
>
> --
> Sent from the MicroControllers - PIC forum at Nabble.com:
> http://www.nabble.com/-OT-Searching-for-circuits-t762418.html#a1993112

Attachments which on show up on nabble sure make that confusing

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