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 51 
 on: June 25, 2021, 02:04:23 02:04 
Started by kripton2035 - Last post by optikon
Use an oscilloscope to measure your oscillations and post the pic.

 52 
 on: June 25, 2021, 12:17:56 00:17 
Started by kripton2035 - Last post by PM3295
Did it ever work correctly with the new current source?
What is the amplitude of the oscillations?
Can you show the scope display capture?

 53 
 on: June 24, 2021, 10:19:15 22:19 
Started by metal - Last post by IVN1479
Hi.

Is the medicine compressed or has only the file extension been changed?

It doesn't work for me.

Posted on: June 17, 2021, 04:10:44 16:10 - Automerged


It has been compressed, sorry for the misunderstanding. It has worked correctly.

Regarding the new version (3.xx), there are changes in the concept of the C language.

My projects without harmony v2 or v3 compile perfectly with version XC32 v3.00, but those who use that tool, the compiler gives errors. Any suggestions what can be done?

I have fixed the problem with Harmony 3 and XC32 version 3.xx.

The solution is the next:

1. Harmony 3 packages must be updated.

2. Open the MHC and regenerate the project code.

The new generated code has the property of detecting if the compiler version is 2 or 3 is being used, depending on that it modifies the code so that there are no compilation errors.

There is no solution for Harmony 2 version, you must use the latest version of xc32 (2.50)

 54 
 on: June 24, 2021, 07:54:23 19:54 
Started by kripton2035 - Last post by Catcatcat
Zener diodes tend to produce white noise, it may be worth analyzing in this direction.

 55 
 on: June 24, 2021, 06:11:47 18:11 
Started by kripton2035 - Last post by kripton2035
there is no LC or RC or ferrite bead on the +V line, but as the power supply is a 9v battery is it really necessary ?

no the initial schematic was a little different, there was no zener look at the preivious page of this thread, or the schematic on my web page for the project
the new current source is less dependant of the supply voltage, so it should have a better reproductibility of the measures.

 56 
 on: June 24, 2021, 04:17:04 16:17 
Started by kripton2035 - Last post by kreutz
It will probably benefit if you use some kind of EMI filtering at the input of the opamp. See http://ww1.microchip.com/downloads/en/appnotes/00001767a.pdf (Solutions for Radio Frequency Electromagnetic Interference in Amplifier Circuits by Microchip) for ideas. Or better yet [url]https://www.analog.com/media/en/training-seminars/tutorials/MT-070.pdf/url] by Analog Devices.

 57 
 on: June 24, 2021, 12:44:37 12:44 
Started by kripton2035 - Last post by Old_but_Alive
is there a LC or RC filter into the opamp  +ve supply line ?

it will need decoupling from the rest of the circuit.

suggest something like a ferrite bead or a 10R resistor, and 1UF or 10uF capacitor,

 58 
 on: June 24, 2021, 08:31:17 08:31 
Started by kripton2035 - Last post by Catcatcat
If initially there was no such problem, then most likely this is due to the layout of the components on the printed circuit board.

 59 
 on: June 24, 2021, 07:52:35 07:52 
Started by kripton2035 - Last post by kripton2035
the schematic looka actually like this, with a more stable current source.
I have oscillations at the output of the aop, around 10-20Hz that forbid the precise measure
I've put decoupling capacitors 1-10F on each IC with no luck.

 60 
 on: June 24, 2021, 06:16:17 06:16 
Started by metal - Last post by Catcatcat
Thank you, it turned out to be activated! The problem was that I launched the cmd in normal mode, and not as an administrator. Cheesy

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