Searching \ for '[OT] Searching for circuits' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=searching+circuits
Search entire site for: 'Searching for circuits'.

Exact match. Not showing close matches.
PICList Thread
'[OT] Searching for circuits'
2005\12\17@150754 by Bill Kuncicky

picon face
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

2005\12\17@152932 by Tom Sefranek

face picon face
Comparitor.

Bill Kuncicky wrote:

{Quote hidden}

--
 *
 |  __O    Thomas C. Sefranek   spam_OUTWA1RHPTakeThisOuTspamARRL.net
 |_-\<,_   Amateur Radio Operator: WA1RHP  
 (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz

hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org


2005\12\17@153431 by olin piclist

face picon face
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.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2005\12\17@155548 by David Van Horn

picon face
> > 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" ?



2005\12\17@192316 by William Chops Westfield

face picon face

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

2005\12\17@201634 by Steph Smith

flavicon
face
>(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 ;-)

2005\12\17@205016 by ike, K8LH (sent by Nabble.com)

flavicon
face

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

2005\12\18@005730 by Dave Lag

picon face
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

More... (looser matching)
- Last day of these posts
- In 2005 , 2006 only
- Today
- New search...