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Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.
We found 113 threads matching "adc"
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The most relevant threads are listed first
Why use amplifier with adc?
2008-10-21 02:14:00
I don't know very well how adc works, so i have a question. Most adc
have a Vref pin that defines Vin range of adc. Vin range of adc is
then divider for 2^n (n=resolution) to obtain LSB. If i resize Vref,
new Vin range (smaller) is divided for 2^n, so LSB has smaller
value.If i have a sensor, wh...
About ADC
2008-11-26 14:59:00
I have not understand some definition used with adc...
1)what is ENOB?A 12 bit adc with enob equal to 11 bit means that 11bit
represent the real value and last 1 bit is error affected?
2)what is "noise free resolution"?What is it's difference with enob?
Thanks in advance
...Re: humidity sensor
2009-03-24 18:56:00
I'm using the HIH-4000 family of sensors ($15-20 at digikey) for my
home thermostats. They give out a DC voltage proportional to
humidity; if your PIC has an ADC that's all you need. They also
interface nicely with the maxim "battery monitor" 1wire chips (such as
phanderson uses), which have...Re: trying to understand the REF pin on a DAC
Peter Bennett - 2007-10-30 14:06:00
On Tue, 30 Oct 2007 13:50:42 -0000, kasterborus@yahoo.com wrote:
> Decimal is the input pin of an Arduino "analog in" - I'm not sure if
> full scale is 500, or 1000, but as you can see the DAC is not
> returning analog voltages quite in step with the input commands.
If you are unsure of th...repeated data conversions
Jon Slaughter - 2007-07-06 16:19:00
I was wondering just how bad data is corrupted through repeated conversions.
I have this idea to test it and was wondering how hard it would be to set
up.
Essentially you have a ADC, DAC, buffer, and control system.
you initially setup the buffer with the required digital data.
Then t...how I can connect 89c51serial port to telephone lineto send data?
2007-05-27 13:07:00
dear all,
I try to send vedio from cctv via telephone line I connect the cctv
camera output to ADC and the output of the ADC to Atmel 89c51
micocontroller to send the data serial but I want to connect the
output of the atmel89c51 to the telephone line
please help?
what the next step
...Re: PIC suggestions needed
David L. Jones - 2009-03-14 19:38:00
"Wes" wrote in message
news:jZVul.37480$Yx2.21841@en-nntp-06.dc1.easynews.com...
> I want to play with a PIC. Microchip has an inexpensive programmer.
>
> Is this a good item to start with?
>
> http://www.newark.com/jsp/search/productdetail.jsp?CMP=ILC-1c126onlinecatalog&sku=44K0230...Re: Isolation
John Fields - 2007-01-30 17:39:00
On 30 Jan 2007 10:23:05 -0800, "lerameur"
wrote:
> Hello,
>
> I am building a robot and wanted to have isaltion between the
> microcontroller and the motor. So Iknow have two batteries (one for
> each) . I aslo want to have a voltage checker for each battery.
> Because the reference ...Re: Adjustable voltage regulator for car alternator
MooseFET - 2007-04-21 12:25:00
On Apr 21, 8:15 am, "marcus" wrote:
> Thanks, Jim for the reply ~
>
> I do have a temp. sensor setup already going into my Plasmatronics
> regulator, so I could use a temp. compensated circuit, at the risk of
> complexity/your time.
>
> I haven't procured/scrounged the alt. yet, so ...Re: What is the smallest voltmeter?
Jason von Nieda - 2007-01-31 16:09:00
Bruce W.1 wrote:
> Expensive little guy isn't it? My battery pack (12 C-cells) exceeds its
> [14VDC] voltage rating.
>
> BTW, I'm also building a Pulse Width Modulation circuit so I don't fry
> my 12VDC lightbulbs. This voltmeter will monitor its input and output
> voltage.
Bruc...External clock for Analog to Digital Converter
Bilal Amin - 2007-02-26 23:08:00
Hi Everyone,
I am working on Jitter in Analog to Digital Converters(ADCs). I am
trying to setup an experiment to see the effects of jitter in real
time ADCs. I have an ADC evalutaion board with external clock input
for sampling (i.e Sampling clock).
Now I want to produce a self created jittery ...Re: Simple audio encoding... how?
John Fields - 2008-12-09 17:18:00
On Mon, 8 Dec 2008 17:53:44 -0800 (PST), MooseFET
wrote:
> On Dec 8, 8:55 am, John Fields wrote:
> > On Sun, 7 Dec 2008 17:02:55 -0800 (PST), MooseFET
> > wrote:
> >
> >
> >
> > > On Dec 7, 10:31 am, John Fields wrote:
> > > > On Sun, 07 Dec 2008 14:33:09 GMT, N0S...@d...Re: Simple audio signal to level convertor?
Eeyore - 2008-07-02 23:32:00
Bob Eld wrote:
> "Eeyore" wrote
> > Bob Eld wrote:
> >
> > > Insure that the max peak of the audio signal is within
> > > the ADC range.
> >
> > Diode clamp it !
> >
> > Graham
>
> Yeah you can clamp it but then you loose that and higher values as peaks.
> Th...Re: How to provide analog power
Tim Auton - 2006-11-02 09:10:00
Markus Zingg wrote:
>
> I do have a digital design requiereing 3.3 and 5v supply. One of the
> chips however is a mixed signal kind and requieres analog ground and
> analog power (also 3.3v). The external voltage I can use is 12v and
> apart from this mixed signal chip, I would have us...Re: Simple audio encoding... how?
John Fields - 2008-12-10 07:58:00
On Tue, 9 Dec 2008 17:49:35 -0800 (PST), MooseFET
wrote:
> On Dec 9, 2:18 pm, John Fields wrote:
> > On Mon, 8 Dec 2008 17:53:44 -0800 (PST), MooseFET
> > wrote:
> >
> >
> >
> > > On Dec 8, 8:55 am, John Fields wrote:
> > > > On Sun, 7 Dec 2008 17:02:55 -0800 (PST), Mo...Impedance Calculation
Rob - 2007-04-02 10:28:00
Hello,
I have a quick question.
I have an RC low pass filter and I need to calculate the impedance so
I can match it to a SAR ADC.
What would the steps be to calcuate the impedance?
Thanks,
Rob
...Re: Sound Recording ChipSet?
Jamie - 2006-11-15 20:52:00
Jim Douglas wrote:
> I want to make a small device that will record basic sound snippets, for
> example, depending on the size of the memory, 100-500 3-5 seconds sound
> snippets. It needs to be real small, possibly the size of a matchbook.
>
> Any ideas on where to look, I have google...Re: Switch inputs
Jan Nielsen - 2007-04-10 10:07:00
John Fields skrev:
> What are you using as a readout and what kind of accuracy are you
> looking for?
>
The sensors are primary LM35 and LM34.
I am using picaxe 18X to read them (has 3 adc inputs, would like 6 or 8)
0.5C would be nice but 1C will work too.
/Jan
...Re: Digital Electric Fence Tester?
whit3rd - 2009-05-09 18:08:00
On May 6, 5:49=A0am, "tor...@torgil.com" wrote:
> Hi!
>
> I've got an electric fence with 1Hz high-voltage pulses (2kV-10kV).
> I'd like to monitor the voltage from the fence using an ADC. Could
> anyone give me some ideas for a high-impedance circuit that could be
> connected to an A...Importance to be in Full Scale for ADC
2008-10-08 12:44:00
Why is it important to be full scale when performing the analog-to-
digital conversion?
...Hall Effect Sensors
Michael - 2007-04-08 10:36:00
Hi,
I'd like to interface Hall Effect sensor to a uC and have picked out the
A1301EUA-T (datasheet:
http://www.allegromicro.com/en/Products/Part_Numbers/1301/1301.pdf ) with no
particular reason - just seems easy to get hold off.
Now based on the graph at the bottom left on page 5, am I ...Re: downconversion
John Fields - 2006-10-29 13:30:00
On 29 Oct 2006 08:40:02 -0800, bob@coolgroups.com wrote:
> If I wanted to downconvert a 2.4 GHz wireless signal into something I
> could run through an A/D converter, what is the easiest way to do the
> downconversion?
---
2.4GHz> ----[MIXER]---[LPF]---[ADC]
|
...Re: Does anyone know a way to take an audio signal and output it multiple times with different amplitude and phases tia sal2
please_post_to_groups - 2008-11-12 16:45:00
Thanks for the response
I know ADC is analog to digital converter but what is a LUT?
Can anyone point to an example circuit with real components that may do this or an off the shelf item
Tia sal2
...What is an adc with pseudo-differential inputs?
2007-07-04 19:35:00
Hi. I've done some reading (eg Horowitz & Hill and other books), but I
can't find an explanation to what pseudo-differential inputs is. Could
someone explain or direct me to an application note?
Thanks
Juan Herrera
...Re: Narrow pulse generation
John Larkin - 2007-03-09 17:12:00
On Fri, 9 Mar 2007 15:12:26 -0600, "Anthony Fremont"
wrote:
> John Larkin wrote:
>
> > Electrical TDR usually uses a step, not a pulse. My TDR scopes all
> > seem to use a square wave, 100 KHz ballpark, to generate a repetitive
> > step, although you might go slower to shoot out reall...Re: How to make Digital Speedometer?
abhi - 2006-11-28 05:47:00
you need a hall sensor from which u can get square pulses with duty
cycle depending upon speed.. u can say that is a pwm type of signal.
now u assign bits through mathematical formula or here algorithm for
duty cycles, ofcourse after ADC. u use proper interface to LCD.. it is
simple u just star...Re: PIC a/d puzzler
James Beck - 2006-10-09 11:43:00
In article , randy.day@shaw.cax
says...
> mix of 50k and 100k pots.
>
That could be part of the problem.
The pot should be equal to or less that the input impedance of the ADC
and I think on most PICs that is 25K.
The next thing is the MCU should have good power decoupling caps to k...Re: Home-use microcontroller purchase
Freelance Embedded Systems Engineer - 2008-01-12 17:49:00
David wrote:
> I took a few microcontrollers classes years ago and would like to start
> using one at home. I've been looking at a few solutions and would like
> feedback on them. My first project will likely be creating a motor
> controller (dc stepper or servo).
>
> I am familiar...Battery Level Monitor
Michael - 2006-09-17 14:13:00
Hi,
I'd like to create a 12V battery monitor and interface it to a PICAXE-08M
running at 3.3V.
What would be the best way to do this? I was thinking about using a 3.3V reg
for the picaxe and then use a voltage divider so the changes in voltage can
be picked up using the onboard ADC.
W...Re: Looking to filter the noise on a Sharp IR sensor
Chris - 2008-05-27 07:51:00
On May 26, 5:45=A0pm, Kasterborus wrote:
> I just hooked up a Sharp GP2D12 IR range sensor to a scope and saw
> that the output is very noisy. The sensor updates at 25Hz so I was
> thinking that if I were to add some kind of 25Hz low pass filter to
> the output that would clean things up....Re: Mystery Box
2009-03-10 09:29:00
> > What's your best guess regarding the circuit inside the box?
Six switches and some resistors. This encoding technique has been
used in automotive applications to minimise the number of connections
that need to cross slip rings or flexible interconnects when getting
signals from the stee...Interfacing A Pressure Sensor
Michael - 2006-09-12 15:54:00
Hi,
I have a pressure sensor (http://www.farnell.com/datasheets/8717.pdf - page
4) which uses positive and negative pins to output the pressure. As the
pressure increases the (potential) difference between the pins also
increase.
How do I go about interfacing this to a microcontroller (P...Problems about pic thermometer
Novel - 2009-03-03 18:36:00
Now I am doing a pic thermometer which use the LM19 temperature sensor
to measure the temperature and display on the 2*16 LCD without
backlight.
And I have a pic18f45k20 microcontroller chip and 4504N adc converter.
I have connect the temp sensor to pin 9 of the pic18f45k20.
Now I just want to ...Magnitude Comparators
Michael - 2007-12-07 05:40:00
Hi,
I'm working on a school project where I need to compare 16bits (4 BCD
values) from a CMOS logic system and need alternative ways of doing it.
So far I've got 4 cascaded 4063 bit comparators, ADC conversion but I'm
struggling for a third. Can anyone suggest a method?
I was thinking a...Simple electret "pre-amp"
grubertm@gmail.com - 2007-04-30 20:14:00
I am using a Logitech/Labtech USB microphone which is doing an okay
job but could benefit from some more gain. I don't want to touch their
ADC and USB circuit but would prefer adding something in-line. Given
that their 2-wire electret micro is powered by 2.5v on the signal line
what would be a s...Re: Signal Processing Via USB Port
John Larkin - 2009-09-08 22:54:00
On Mon, 7 Sep 2009 19:32:06 -0700 (PDT), Bret Cahill
wrote:
> If all you have to do is buy a $200 netbook, an A to D converter and
> download some software isn't it a waste of time screwing around with
> circuits?
>
>
> Bret Cahill
>
What OS does the netbook run? How many seconds ...Re: Simple audio encoding... how?
John Fields - 2008-12-08 11:55:00
On Sun, 7 Dec 2008 17:02:55 -0800 (PST), MooseFET
wrote:
> On Dec 7, 10:31 am, John Fields wrote:
> > On Sun, 07 Dec 2008 14:33:09 GMT, N0S...@daqarta.com (Bob Masta) wrote:
> > > On Sat, 06 Dec 2008 08:20:51 -0600, John Fields
> > > wrote:
> > > > I think the trick is to get ri...ADC current requirement
nogoodinel - 2007-02-07 02:09:00
Im still working on ATmega16 which has buil-in A/D -converter. It
seems that the converter is a drain for 10mA current ( 0 - 5 V ).
Devise that feeds the analog voltage gives only 5mA ( 0 - 10 V ). So
at the moment when I connect the lines, voltage drops heavily from
about 4 V --> some mV.
...Re: tiny inductor with every bypass cap?
Vladimir Vassilevsky - 2008-06-23 16:03:00
Joel Koltner wrote:
> "Vladimir Vassilevsky" wrote:
> > Despite of the popular beliefs, many
> > analog or digital designs can be built in two layers just fine. It takes
> > care, understanding and attention to details.
>
> For many companies, coming up with that "care, understa...Re: What will happen if an analog signal is passed through a DAC?
David L. Jones - 2009-03-04 02:00:00
"GreenXenon" wrote in message
news:5d581ca1-9021-4de5-801a-abb58e405007@o2g2000prl.googlegroups.com...
> Hi:
>
> What will happen if an analog signal is passed through a DAC [Digital-
> to-Analog Converter]?
Simulate it, it'll keep you occupied for hours.
And if you wait long enou...