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I try to measure resistance of an RF component (R ??).
For not deteriorate, a voltage must be applied to it <1mA and 100mA.
The divider bridge R1 / R3 is used to lower the voltage and current at the component terminal.

on my schematic:
R ?? = = 1ohms Vampli 101.2mA
R ?? = 50 ohms Vampli = 4.94mA
Vampli will return to a pin of the analog digital converter.
Of course I'll put more capacitor.
Same as the subject.
Hardware / Antirimbalzo hardware pull-up
Last post by Zamundo - Today at 08:52 am
Ragazzi Buongiorno!

Mi confermate che un valido debounce hardware possa essere come da foto che vi mostro ?
E' giusto il valore del condensatore ?
Ovviamente parliamo di internal pull-up!
Project Guidance / Re: Fraquency domain and rolli...
Last post by sossio89 - Today at 08:51 am
There are some results from my acquisition:

Deutsch / Re: LM75 ohne Marke !!
Last post by Georges97427 - Today at 08:50 am
Hallo Uwe,

Vielen Dank für die Mühe !!
Es war Der richtige Tipp.
Leider muss man sagen dass die "abgeschrägte" Kante nicht sehr sichtbar ist, sogar mit der Lupe!!

Software / Re: ARDUINO + sensore ultrasuo...
Last post by massibal - Today at 08:46 am
ieri sera ho verificato ed ineffetti il mio problema è che ho sempre usato il digitalread (pin) ma in questo caso mi sembra che non abbia senso usare il pin ECHOPORT !!!la tua soluzione non la conosco ...
mi potresti aiutare ..scrivendo 2 righe di Sketch?

buona giornata
Generale / Re: Analisi vibrazionale con a...
Last post by sossio89 - Today at 08:45 am

Questa è un'acquisizione durante la quale è stato avviato e poi spento il motore.
Displays / Re: Hookup Guide: 240x128 Grap...
Last post by yatin - Today at 08:43 am
Hey thanks for the support!
I just want to ask you that I want to print one continuous wave form so can we shift our entire selected pixels towards right or left? or do we have to re print entire data again pixel by pixel
Ok. Good diagram, but I don't fully understand it.

What is the purpose of R3? Its value is insignificant in parallel with 50ohms.

Are you trying to indicate the voltage at Vmeasure will be 0.057V for 1ohm and 0.067V for 50ohm? That is an incredibly small voltage range to try and amplify. There will be a lot of microvolt noise to swamp your measurement.
Deutsch / Re: probleme mit LM75
Last post by Georges97427 - Today at 08:41 am

Die "Wiederauferstehung" mach dass es wieder funktioniert !!!

Vielen Dank an Dich agmue für die Hilfe zum aufstehen und sündigen (manchmal mit Genuss)!!!


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