Electronics > Beginners
DIY Differential probe again again - please help :-)
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ogden:

--- Quote from: FriedMule on October 06, 2019, 03:53:11 pm ---Sorry if I have not explained that in a good enough manner, I did try at my comment number 6:

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THAT project do not need differential probe. It does not even need scope. Thou may benefit from proper signal gen, not necessarily 500MHz. There is nothing wrong about being beginner, but before drawing moon rocket plans, you shall *build* at least one working paper plane first. So I strongly suggest you to carefully consider following advice:


--- Quote from: MagicSmoker on October 06, 2019, 12:27:16 pm ---copy a successful design *exactly*.

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FriedMule:

--- Quote from: ogden on October 06, 2019, 05:32:49 pm ---
--- Quote from: FriedMule on October 06, 2019, 03:53:11 pm ---Sorry if I have not explained that in a good enough manner, I did try at my comment number 6:

--- End quote ---
THAT project do not need differential probe. It does not even need scope. Thou may benefit from proper signal gen, not necessarily 500MHz. There is nothing wrong about being beginner, but before drawing moon rocket plans, you shall *build* at least one working paper plane first. So I strongly suggest you to carefully consider following advice:


--- Quote from: MagicSmoker on October 06, 2019, 12:27:16 pm ---copy a successful design *exactly*.

--- End quote ---

--- End quote ---
You are completely correct that it may not need a probe but, as a beginner, I would like to see where what is happening, on top of that do I plan on building a simple PSU for it, just to learn what PSU "signal" do to that circuit, what make the 500MHz behave wrong, bad or you know. :-) So selected a project that is easy-ish to make, had max MHz my scope can handle to learn what happens and how do my scope react... Or in short, just to see what is going on all sort of places in the circuit.

LOL I love the way you say it about not building a space rocket before even learn to fold a paper plane:-) But again as a beginner, it is hard to know what is a paper plane project and what is a moon landing:-)
ogden:

--- Quote from: FriedMule on October 06, 2019, 05:48:43 pm ---So selected a project that is easy-ish to make, had max MHz my scope can handle to learn what happens and how do my scope react... Or in short, just to see what is going on all sort of places in the circuit.

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Well.. Everything is fine while you do not require your 65V common mode range for high speed differential probe. That is very "unusual spec" if I can say so. Either stick with common mode range of existing DIY diff probe designs or do not call it "easy-ish to make". Please do not get me wrong - I am not trying to discourage you from your idea. Sometimes brave ideas of unaware are surprisingly successful :D Yet I still afree agree that you better start with building *exact* copy of working diff probe, then think of increasing it's common mode voltage range.

Why do you think 1:10 500MHz scope probes cost so much? - because of probe manufacturer's cartel? ;)
FriedMule:

--- Quote from: ogden on October 06, 2019, 06:08:37 pm ---
--- Quote from: FriedMule on October 06, 2019, 05:48:43 pm ---So selected a project that is easy-ish to make, had max MHz my scope can handle to learn what happens and how do my scope react... Or in short, just to see what is going on all sort of places in the circuit.

--- End quote ---

Well.. Everything is fine while you do not require your 65V common mode range for high speed differential probe. That is very "unusual spec" if I can say so. Either stick with common mode range of existing DIY diff probe designs or do not call it "easy-ish to make". Please do not get me wrong - I am not trying to discourage you from your idea. Sometimes brave ideas of unaware are surprisingly successful :D Yet I still afree agree that you better start with building *exact* copy of working diff probe, then think of increasing it's common mode voltage range.

Why do you think 1:10 500MHz scope probes cost so much? - because of probe manufacturer's cartel? ;)

--- End quote ---
Thanks:-) The 65V is due to it's max I do work with and why not build it to be able to handle max. (my innocent thought) By easy-ish I meant the project board at 500MHz, not the probe:-) I did / do think that most electronic, made by Agilent and other is much more expencive then needed to be, due to name, manufacturing and the 1000V capabilities. So I did thought, DIY and low voltage (65V) would be much cheaper and maybe not as difficult as a 2GHz 1000V Agilent you can buy.

I have two channels and would like to measure on maybe the PSU while also look at the 500MHz board, so that's why.
ogden:

--- Quote from: FriedMule on October 06, 2019, 07:05:14 pm ---I did / do think that most electronic, made by Agilent and other is much more expencive then needed to be, due to name, manufacturing and the 1000V capabilities.

--- End quote ---
Urban myth. If you have ANY 500MHz "original/brand" probe, then buy cheap 500MHz probe from China (if any) and compare. You will see that "you get what you pay for" saying makes sense.


--- Quote ---So I did thought, DIY and low voltage (65V) would be much cheaper and maybe not as difficult as a 2GHz 1000V Agilent you can buy.

--- End quote ---
Dreamer :)
65V differential probe that compares to 2GHz 100V Agilent probe may take years of your "career" and all your savings. Better just buy one.
[edit] Failure to complete my 10 minute homework even after so many posts just confirms that probe you are dreaming about is above your paygrade. Sorry.
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