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Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project
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S. Petrukhin:

--- Quote from: Gandalf_Sr on September 02, 2020, 12:55:05 pm ---
--- Quote from: S. Petrukhin on September 02, 2020, 11:30:27 am ---It is not a problem to make an end-to-end USB channel from the oscilloscope's USB connector to the USB connector on the amplifier's PCB.
Along the way we can take away a bit of power for the amplifier. I don't like free-standing boxes. :)

--- End quote ---
Yes, that is a good idea.  One question is to make sure that the 5V supply from the USB connection doesn't bring noise into the amplifiers.

--- End quote ---
Will need to take care of filtering the power supply for the amplifier.
Sharp:
Very good work Petrukhin and the ones supporting you  :D ;D

What is the next step concerning production ?  Do you have a cheap Chinese company looking into doing the production ?   :horse: :scared:
S. Petrukhin:

--- Quote from: Sharp on September 12, 2020, 04:22:36 pm ---Very good work Petrukhin and the ones supporting you  :D ;D

What is the next step concerning production ?  Do you have a cheap Chinese company looking into doing the production ?   :horse: :scared:

--- End quote ---

Have not production. This is made for personal use.  :-BROKE  :-/O
Michael960:
Hi!

First, thank you very much for this idea!

I need 13.5 V inputs for car diagnostics. So I'm thinking of extend the circuit to arbitrary higher voltages by putting 5V zener diodes in parallel to the inputs and putting 1MOhm resistors in series to this combination of inputs and zener diodes?

Do you see any disadvantages of this?

Best regards
Michael
S. Petrukhin:

--- Quote from: Michael960 on September 28, 2020, 05:00:54 am ---Hi!

First, thank you very much for this idea!

I need 13.5 V inputs for car diagnostics. So I'm thinking of extend the circuit to arbitrary higher voltages by putting 5V zener diodes in parallel to the inputs and putting 1MOhm resistors in series to this combination of inputs and zener diodes?

Do you see any disadvantages of this?

Best regards
Michael

--- End quote ---

Hi, Michael!

I think 1mOm is a lot. This is not a good idea at all. The logical zero voltage in the 13.5V line may be the logical high voltage in the 3.3V line.
And keep in mind that the voltage of the vehicle's on-board network can reach 14.6V.
it is better to use a voltage divider on two resistors.
And even better use a more advanced and inexpensive also probe from sir Gandalf_Sr https://www.eevblog.com/forum/testgear/ms05000-budget-logic-analyzer-probe-set-design/ This probe can use external threshold voltage.
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