If I were smart, I would actually paste the link in the message.
Here goes
http://s299.photobucket.com/albums/mm286/mimewar/ICs%20for%20sale%20or%20trade/
Success!
On Oct 12, 11:25 pm, Shane Ellis wrote:
> I have a small IC caddy full of ICs I believe to be logic ICs. Look a
> the link I have
I have a small IC caddy full of ICs I believe to be logic ICs. Look a
the link I have attached, the pics are high resolution, so you can
make out part numbers. If you want them, let me know, they are of no
use to me. Pay for the shipping, and they will be delivered
promptly. I only ask the favo
Hello Frank,
well as I said, I first suspected it was an offset, but it turned out
to be a linearity error. So I probably made some mistakes in the
measurement of the resistors, I don't know for sure. So I changed the
slope of my linear model.
Jens
On 12 Okt., 22:21, "Frank Bemelman" wrote:
>
- Original Message -
From: "Jens Boos"
To: "neonixie-l"
Sent: Tuesday, October 12, 2010 9:46 PM
Subject: [neonixie-l] Re: Weird MAX1242 ADC behaviour
And another follow-up: I realised my offset was in fact a linearity
error, so I tweaked a little bit, and a correcting term of 0.004
And another follow-up: I realised my offset was in fact a linearity
error, so I tweaked a little bit, and a correcting term of 0.004 / Bit
did the trick. Is this ethical? ;-)
Jens
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And it's me again,
I checked the supply, it is 4.99V, that is not too bad. I adjusted
that in my calculation and got 0.3215 V / Bit.
The multiplication works fine.
I do not know what was wrong before, now the voltmeter is accurate to
1V (as compared to my 40EUR multimeter). I know, that is not r
Hello,
oh I just realised that there was in fact a bit shifting error in the
"readADC()" routine. Embarassing. I did not see it the whole day. OK
now the data is correctly transferred into the PIC, next thing to
check will be the multiplication (because the values are still off by
about 20V). Or t
On 10/12/10 5:52 AM, Jens Boos wrote:
Hello folks,
I am currently building a digital voltmeter (3 x IN-14, 1 x IN-19A)
using the 10 Bit ADC MAX1242 and the PIC16F627A as the controller. I
would like to measure voltages up to 300V.
Here is what I did:
- Vref was conencted to the 5V logic supply
> I am currently building a digital voltmeter (3 x IN-14, 1 x IN-19A)
> using the 10 Bit ADC MAX1242 and the PIC16F627A as the controller. I
> would like to measure voltages up to 300V.
>
> Here is what I did:
>
> - Vref was conencted to the 5V logic supply voltage, buffered with
> 2.2uF and 100nF.
Hello folks,
I am currently building a digital voltmeter (3 x IN-14, 1 x IN-19A)
using the 10 Bit ADC MAX1242 and the PIC16F627A as the controller. I
would like to measure voltages up to 300V.
Here is what I did:
- Vref was conencted to the 5V logic supply voltage, buffered with
2.2uF and 100nF.
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