Author: j_slobo@hotmail.comDate: 06:15 14-06-08
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Is there some way to detect a 3-5volt say khz clock using an ordinary
instrument(no osciloscope)
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Author: N_CookDate: 07:31 14-06-08
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Author: John FieldsDate: 07:50 14-06-08
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On Sat, 14 Jun 2008 03:15:26 -0700 (PDT), "j_slobo@hotmail.com"
<j_slobo@hotmail.com> wrote:
>Is there some way to detect a 3-5volt say khz clock using an ordinary
>instrument(no osciloscope)
---
AC or DC voltmeter.
JF
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Author: Gareth MagennisDate: 08:32 14-06-08
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Author: Bob MastaDate: 08:41 14-06-08
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On Sat, 14 Jun 2008 03:15:26 -0700 (PDT), "j_slobo@hotmail.com"
<j_slobo@hotmail.com> wrote:
>Is there some way to detect a 3-5volt say khz clock using an ordinary
>instrument(no osciloscope)
You can use your computer's sound card. You can add a voltage
divider to insure the sound card Line input is getting less than about
3 Vpp, if you want to make sure you don't clip its input. (The input
can handle 5V without damage, but the wave will be clipped.) If you
want to avoid loading the clock output with the sound card input
(which can be in the 2K to 47K range), you can use big resistors for
the divider. Don't worry about dividing it down too low... the sound
card has 16 bits of resolution, so you'll be able to see
sub-millivolts easily.
SHAMELESS PLUG: You can try my Daqarta software for free.
It has calibration options so you can use it as a real scope (as well
as spectrum analyzer, frequency counter, voltmeter, sound level meter,
signal generator, etc, etc). If you decide not to buy (US$29.00)
after the trial expires, the inputs stop working but the signal
generator keeps working FREE forever, along with file analysis, etc.
I'll be glad to answer any questions.
Best regards,
Bob Masta
DAQARTA v4.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!
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Author: bzDate: 08:45 14-06-08
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Author: William SommerwerckDate: 10:02 14-06-08
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Might I point out that an oscilloscope _is_ an "ordinary instrument"? At
least, in my sense of the word "ordinary" -- it's ordinarily found in any
electronics shop.
I work at Microsoft Hardware, and there has been a total switchover to
multi-color LCD 'scopes. The cheaper ones are not _horribly_ expensive.
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Author: FleetieDate: 10:49 14-06-08
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The obvious choice, as Mr Cook says, is a crystal earpiece.
With one of those, the OP won't even need to make 2 connections;
just touching the tip of the jack plug on the conductor that's
oscillating at a few kHz and a few volts will be enough to make
it faintly audible with careful listening.
Martin
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Author: Ron(UK)Date: 12:01 14-06-08
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Fleetie wrote:
> The obvious choice, as Mr Cook says, is a crystal earpiece.
>
> With one of those, the OP won't even need to make 2 connections;
> just touching the tip of the jack plug on the conductor that's
> oscillating at a few kHz and a few volts will be enough to make
> it faintly audible with careful listening.
>
One of the most useful bit of kit in my toolbox is a device I made
myself some 35 or so years ago. It`s a crystal earpiece with one wire
terminated in a croc clip and the other in a probe made from an old
ballpoint pen and a brass nail, there`s a capacitor in series to provide
DC blocking.
With this simple device I can trace audio through a circuit- from the
output of a crystal pick-up to several hundreds watts, I can detect
digital pulses, hear hum on a DC supply, etc. etc.
Ron(UK)
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Author: Sjouke BurryDate: 12:15 14-06-08
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j_slobo@hotmail.com wrote:
> Is there some way to detect a 3-5volt say khz clock using an ordinary
> instrument(no osciloscope)
Buy a meter with freq. range. A lot of them are
equipped with that.
Mine(78Euro Extech)has Farad/Hertz/Farenheit/Celcius as
bonus ranges, temp is done with a termocouple.
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Author: christofireDate: 14:56 14-06-08
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Author: JamieDate: 17:40 14-06-08
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Author: Franc ZabkarDate: 02:12 15-06-08
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On Sat, 14 Jun 2008 03:15:26 -0700 (PDT), "j_slobo@hotmail.com"
<j_slobo@hotmail.com> put finger to keyboard and composed:
>Is there some way to detect a 3-5volt say khz clock using an ordinary
>instrument(no osciloscope)
If you are asking this question because you need to detect whether the
clock is oscillating, rather than trying to measure its frequency,
then find a buffered logic gate where the clock should be present and
measure the voltage there. If the clock is oscillating, then you
should measure a DC voltage equivalent to half the supply rail.
Depending on the frequency response of your multimeter, the voltage on
the AC range may be 0, so that won't be a good guide. If the clock is
dead, then the gate will be sitting on 0V or close to the positive
supply rail. Of course I'm assuming that the clock is a 50:50 square
wave. BTW, you probably won't get any sensible result measuring the
voltage at, or near, the crystal.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
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Author: N_CookDate: 10:06 16-06-08
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Ron(UK) <ron@lunevalleyaudio.com> wrote in message
news:EcOdnfhYQvejds7VRVnyhwA@bt.com...
> Fleetie wrote:
> > The obvious choice, as Mr Cook says, is a crystal earpiece.
> >
> > With one of those, the OP won't even need to make 2 connections;
> > just touching the tip of the jack plug on the conductor that's
> > oscillating at a few kHz and a few volts will be enough to make
> > it faintly audible with careful listening.
> >
>
> One of the most useful bit of kit in my toolbox is a device I made
> myself some 35 or so years ago. It`s a crystal earpiece with one wire
> terminated in a croc clip and the other in a probe made from an old
> ballpoint pen and a brass nail, there`s a capacitor in series to provide
> DC blocking.
> With this simple device I can trace audio through a circuit- from the
> output of a crystal pick-up to several hundreds watts, I can detect
> digital pulses, hear hum on a DC supply, etc. etc.
>
> Ron(UK)
I must do the same sometime.
I've always picked up the standard earpiece and a pair of croc-leads and a
needle point rather than making a purpose built tool. Adding in a HV cap if
monitoring for noisy HT lines.
A scope would not show any more info in that situation and avoids
possibility of connecting scope up, in DC mode, set on 1mV/cm or HT pulse
transmitted through internal cap of scope, on a low range, and out goes dual
gate FET or whatever.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
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Author: BlarpDate: 08:13 17-06-08
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On Mon, 16 Jun 2008 15:06:50 +0100, "N_Cook" <diverse@tcp.co.uk>
wrote:
> must do the same sometime.
>I've always picked up the standard earpiece and a pair of croc-leads and a
>needle point rather than making a purpose built tool. Adding in a HV cap if
>monitoring for noisy HT lines.
>A scope would not show any more info in that situation and avoids
>possibility of connecting scope up, in DC mode, set on 1mV/cm or HT pulse
>transmitted through internal cap of scope, on a low range, and out goes dual
>gate FET or whatever.
At home I have an old analog scope with "Y" output, onto which I
connected a simple amp+speaker.
The ticks / hums / squieks out of the speaker are extremely revealing
about what is measured; most of the time I do not need to look at the
screen at all.
In a cpu setup, one can even hear the software "run" on an adress
line (reoccurring sound patterns), and actually hear subroutines and
such.
At the office, the sophisticated DSO's no longer have this very useful
option..
--
- René
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Author: msgDate: 11:30 18-06-08
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Blarp wrote:
<snip>
> At home I have an old analog scope with "Y" output, onto which I
> connected a simple amp+speaker.
>
> The ticks / hums / squieks out of the speaker are extremely revealing
> about what is measured; most of the time I do not need to look at the
> screen at all.
>
> In a cpu setup, one can even hear the software "run" on an adress
> line (reoccurring sound patterns), and actually hear subroutines and
> such.
Audio monitoring of program execution was standard practice on large
computers for decades and for me is a sadly missed diagnostic of an
often more useful nature than flow graphs and trace dumps. Using
an AM or FM radio near programmed logic can sometimes provide similar
functionality.
Michael
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Author: Rich WebbDate: 11:42 18-06-08
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On Wed, 18 Jun 2008 10:30:38 -0500, msg <msg@_cybertheque.org_> wrote:
>Audio monitoring of program execution was standard practice on large
>computers for decades and for me is a sadly missed diagnostic of an
>often more useful nature than flow graphs and trace dumps. Using
>an AM or FM radio near programmed logic can sometimes provide similar
>functionality.
Then there was the demo program supplied (on cassette tape, natch) by
The Digital Group for their Z80 systems, which "played" the Star
Spangled Banner all over the AM band to a nearby radio while
ASCII-arting a flag-like object on its 16x64 display. Way cool ...
--
Rich Webb Norfolk, VA
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