Products > Test Equipment

MS05000 Budget Logic Analyzer Probe Set Design

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Gandalf_Sr:

--- Quote from: electricMN on April 20, 2020, 04:03:27 pm ---
--- Quote from: Gandalf_Sr on April 19, 2020, 09:48:49 am ---Has anyone I sent the PCBs out to built their LA probe set yet?  Pictures please!

--- End quote ---

Haven't started yet. Been sick for the past couple of weeks. Not coronavirus, thankfully. BP issues which seem to be resolved now. Finally getting some spunk back so will probably tackle those boards this week. I'm finishing up building a 40m ham radio.

--- End quote ---
@electricMN
Sorry to hear you've been sick, hope you feel well now.  These are strange times when we're all stuck at home with SO many things to tinker with.  As I move towards retirement, it occurs to me that I need to be more disciplined with the number of projects I have on the go at any one time.

I have a ham license - had it for ages, in fact I was a ham in the UK where I grew up.  Here in Michigan, I had a nice rotating Yagi antenna system set up and had a contact in Spain on my ICOM IC7000 before a 70 mph wind storm took it all down. Now, the mangled parts are sitting under my deck and the XYL won't let me put it back up :(

Gandalf_Sr:
@WattsThat
I was looking at your pictures again, specifically the second one and it looks like you're taking 5V logic from a genuine Arduino Uno (I think they are 5V).  It looks like you are feeding the 5V reference voltage into the Vext pin but you need to put the switch in the Vext position to have the Vext be used as Vcca of the voltage level translator.  Technically, you're feeding 5V logic into the 'A' side of the chip and Vcca is running at whatever the onboard Vadj is set to which is 3.9V max in my limited experience.  This doesn't exceed the absolute maximum ratings of the voltage level translator and it clearly works but it's not my recommended best practice.

Here's my 'rules' for working with 5V logic.
1. Set SW1 to the Vext position (Vcca is pulled to ground by a 100k resistor).
2. Connect the device under test's 5V rail to the Vext pin on J1

RTFM (read the friendly manual)  ;D

NoisyBoy:
For anyone who has not placed order for the components in the shopping cart yet, a few of them are on backorder at DigiKey.  I placed the order last week, and I am having them ship them all at once, the ship date is May 27th.  I am not in a hurry and didn't want to check Mouser to recreate the cart, but for those of you who can't wait to start building, you may want to shop alternate sources.

BTW, the boards look great, thanks to Gandalf_Sr for putting them together  :-+

Gandalf_Sr:

--- Quote from: NoisyBoy on April 28, 2020, 04:33:52 pm ---For anyone who has not placed order for the components in the shopping cart yet, a few of them are on backorder at DigiKey.  I placed the order last week, and I am having them ship them all at once, the ship date is May 27th.  I am not in hurry and didn't want to check Mouser to recreate the cart, but for those of you who can't wait to start building, you may want to shop alternate sources.

BTW, the boards look great, thanks to Gandalf_Sr for putting them together  :-+

--- End quote ---
@NoisyBoy

Thanks for the kind words.

I have components to build about 3 SETS so, if anyone is REALLY stuck for parts, PM me and I might be able to help.

electricMN:

--- Quote from: Gandalf_Sr on April 28, 2020, 09:32:20 am ---
--- Quote from: electricMN on April 20, 2020, 04:03:27 pm ---
--- Quote from: Gandalf_Sr on April 19, 2020, 09:48:49 am ---Has anyone I sent the PCBs out to built their LA probe set yet?  Pictures please!

--- End quote ---

Haven't started yet. Been sick for the past couple of weeks. Not coronavirus, thankfully. BP issues which seem to be resolved now. Finally getting some spunk back so will probably tackle those boards this week. I'm finishing up building a 40m ham radio.

--- End quote ---
@electricMN
Sorry to hear you've been sick, hope you feel well now.  These are strange times when we're all stuck at home with SO many things to tinker with.  As I move towards retirement, it occurs to me that I need to be more disciplined with the number of projects I have on the go at any one time.

I have a ham license - had it for ages, in fact I was a ham in the UK where I grew up.  Here in Michigan, I had a nice rotating Yagi antenna system set up and had a contact in Spain on my ICOM IC7000 before a 70 mph wind storm took it all down. Now, the mangled parts are sitting under my deck and the XYL won't let me put it back up :(

--- End quote ---

The ham radio I'm building is CW only so I've added another project to my long list. Learn Morse code.  |O

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