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Products => Test Equipment => Topic started by: tekochip on September 18, 2014, 03:03:32 am

Title: SOLVED Logic Probe for Tenma 72-5075
Post by: tekochip on September 18, 2014, 03:03:32 am

I have it all working!

The mating part is a 3M 05111173839, although there are other parts in the family that will mate to it.  The pinout is:

1:5V     2:Gnd
3:5V     4:In5
5:In4    6:Gnd
7:Gnd   8:In6
9:In3    10:Gnd
11:Gnd 12:In7
13:In2  14:Gnd
15:Gnd 16:In8
17:In1  18:5V
19:Gnd 20:5V

The inputs are 5V logic only at a fairly low impedance, so you will need some sort of buffer.  I built a board with a 3V and 1.8V regulator, along with a pair of `07 buffers.  The board is designed to fit into a little tea tin, sort of like an Altoid's box, with a switch to go from 1.8V - 3V, and a connector that fits the Logic Saleae probe set because those are cheap and easy to get.  Plus, I have spares.

If anyone is interested I can post a schematic and I have spare parts as well.

Title: Re: SOLVED Logic Probe for Tenma 72-5075
Post by: JoeO on September 18, 2014, 11:30:43 am

If you have done all this work, then yes, post it here.

Also if you want to get rid of your spare parts, turn on your location flag so we will know where in the world you are.

Title: Re: SOLVED Logic Probe for Tenma 72-5075
Post by: tekochip on September 18, 2014, 12:05:22 pm

OK, here's the schematic and a pair of Eagle files.  Certainly, there are other ways to buffer the probe, but this will get the job done.

Title: Re: SOLVED Logic Probe for Tenma 72-5075
Post by: BONGOJERE on October 09, 2014, 12:25:05 pm

TC,
I can't figure out how to post a question. Can you enlighten me?
Thanks,
J