Using a Logic Probe - Part 1
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- čas přidán 10. 04. 2021
- A quick introduction to using a logic probe in digital circuits.
Logic Probe Used: Elenco Electronics Lp-560
Part 2: • Using a Logic Probe - ...
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Thank you very much your the first that I have seen actually show how to connect a logic probe to the project.
You are welcome. Glad the video helped!
Testing big pcb with TTL works fine if power it up, and measure with voltmeter and pullup from 10k, and again with pulldown 10k. All measurements between 1.5 and 3V are suspect faulty. I use this in 1980.
Informative video. BTW, where'd you get that groovy blue work mat?
Amazon. Glad you like the video!
So .. can I plug my tester on a 12 vdc line for power? Mine is made by radio shack. I think I blew it up thinking I can plug it to a 12 v source.. I was checking a cb radio processor and used the main power
No…no. TTL and CMOS voltages are typically 3.3-5v.
I’m still quite the novice so, I have this chip I’d like to test. It’s a 315-5700, I couldn’t find much info for it, but I do believe it runs on 5VDC. So, my question is: Do I set my logic probe on TTL or CMOS? And, is there a trick, perhaps involving the voltages the chip requires, that could help me know whether I’m dealing with TTL or CMOS? Any insight would be awesome. Great video, btw - make more! Thank you kindly
The best way to identify CMOS vs. TTL is to look up the part number. There is an IC numbering scheme for logic chips that can help. As you get more experienced you will start to notice patterns in numbering, part usage, pcb layout, etc. I start with TTL if I am unsure. However, a multimeter might be a better tool since it can show you a much larger range. Unless you know it is a logic chip I would use a multimeter.
STUART PATTERSON, I have seen other techs take the logic probe and short out two or more data lines or data inputs to troubleshooting IC chips, what is this called? or have you done this?
No, I have never seen that! Let me know if you find that it has a name, technique-wise, I am interested.
@@StuartPatterson arcade repair tech do that for graphics RAM chip troubleshooting anomalies
With this works on like vintage electronics likes solid-state transistors in circuit
No, not really. It is indicating TTL or CMOS voltage levels only.
@@StuartPatterson thanks for the reply I have been trying learn Electronics I guess you learn something new everyday
Kept going in your electronics studies, it gets easier the longer you are at it! Yup, learn something new every day!
Thank you for sharing
Thank you for watching!
What is this mainly used for in everyday terms? What can it troubleshoot? Just old or simple computers?
Debugging any digital circuit where you want to know the logic value.
@@StuartPatterson explain
Part 2 video: czcams.com/video/MzDBmfMaI1o/video.html
At about 4:05 you say, "You can hear...". Those of us that are hearing impaired don't "hear" it. Are there led's on the probe.?
Yes, most probes have leds so you can see the level of the signal.
Why didn't you explain the settings on the probe (pulse/memory TTL/CMOS? Thanks
You asked... here you go: czcams.com/video/MzDBmfMaI1o/video.html
What exact model is this Logic Probe? Thanks
It is the Elenco Electronics Lp-560. I will also add it to the video description.
@@StuartPatterson Thank you! I was so tired I didn't see it! ha ha ha
@@StuartPatterson Have almost the same logic probe, but lp-525. Love that it was made local to me... :) ( the one you said was from radioshack)
Ich habe nichts Leuchten gesehen aber auch nichts gehört, ist das Gerät kaputt gewesen?
Was the logic probe given power 5vdc? The second video might also give you some insight: czcams.com/video/MzDBmfMaI1o/video.html
Yeah yeah. Many internet pics show to us A6 & A7 - are the PORTC pins. But they accordingly to data sheet may work only as input. So there is no any whole port available on nano board.
So there is no any whole port available on nano board. And for bus data line you forced to split data byte and send it by splitting on differents PORTs out pins
Thanks for the reply.
Part # for the logic probe please
The Elenco Electronics LP-560 Logic Probe is what I use.