[neonixie-l] Re: Logic ICs... I think free to whomsoever wants them.

2010-10-12 Thread Shane Ellis
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

[neonixie-l] Logic ICs... I think free to whomsoever wants them.

2010-10-12 Thread Shane Ellis
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

[neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread Jens Boos
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: >

Re: [neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread Frank Bemelman
- 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

[neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread Jens Boos
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 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this gr

[neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread Jens Boos
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

[neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread Jens Boos
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

Re: [neonixie-l] Weird MAX1242 ADC behaviour

2010-10-12 Thread David Forbes
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

[neonixie-l] Re: Weird MAX1242 ADC behaviour

2010-10-12 Thread threeneurons
> 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.

[neonixie-l] Weird MAX1242 ADC behaviour

2010-10-12 Thread Jens Boos
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.