Instrument Basics: Logic Probe - Workbench Wednesdays
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- เผยแพร่เมื่อ 6 ก.ค. 2024
- Logic probes are great for debugging 7400 series logic chips and digital circuits. In this video, James makes a counter circuit and debugs each stage as he builds, with a Logic Probe. If you are wondering, “do I need a logic probe” this video shows how one can be used and even answers when you should consider buying one: bit.ly/347FpSZ
Project Builds:
Programmable logic probe with a PSoC: bit.ly/2Ei7ufO
Logic Probe with Display: bit.ly/2QaowPj
ByEar 2000, a DIY Logic Probe: bit.ly/3iV5fOa
Engage with the element14 presents team on the element14 Community - suggest builds, find project files and behind the scenes video: bit.ly/2MFMG0v
Visit the element14 Community for more great activities and free hardware:
Tech spotlights: bit.ly/2KLz0TS
Roadtest and Reviews: bit.ly/2KH4fj3
Project14: bit.ly/2wPnajx - วิทยาศาสตร์และเทคโนโลยี
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"The LED above my head came on" :D
I have a handy, related tool you may or may not have seen. It's a logic chip probe from HP that has a 14 pin clip (designed to clip onto 100 mil pitch SOIC and DIP logic parts (7400 series) and provides a red/green LED output right on the clip for each pin. I suspect HP and others may still make them and not sure of the cost, but it beats probing logic pin by pin. If you don't have one or haven't seen one, drop me a reply and I'll try to provide a pic or two (and maybe a short vid if you like). With my DSO w 16bit wide logic inputs, I haven't used them (a 14 pin & a 20 pin, I think) in quite awhile, but they're still in my arsenal. Don't even recall where I picked them up. Great content BTW!
What DMM are you using in this video? I’m looking for a new one & love the idea it tests components as well
Very useful and honest. Thanks.
No worries!
@@element14presents I have the same model probe that your using on this video I'm learning electronics and never used a probe before. I wondered if you could tell me what the extra red probe with alligator clip is for and what the three little metal posts are at the cable end of the probe is for, I thought maybe you clip the red probe to one of these and use that for testing. Cheers
good information
Are those Probe Master leads @3:00 ? Super nice quality...
Presumably you've shown how easy it is to build one ... and then start stacking on features.
मस्त सर
you can build one with a cd4049, two leds and three resistors
Do you have a probe that you would recommend?
so...I have a very nice Rigol scope..(that 5 years later I still don't totally understand all the functions lol), but I actually use my logic probe and logic pulsar combo a LOT more....
Damn, fps... I'll get you next time!!!!
I legit thought, "did they have problems with the video?" Then the other LED above my head came on. :)
nice
“Danmmmmmmm I just don’t get it” maybe if I subscribe I will get it.
If you step out of your discomfort zone, wouldn't you be in your comfort zone? ;)
Is this supposed to be for beginners?🤨
Complete NOOB here. Are the 74hct04 chips, C-MOSs or TTLs. Please reply, I'm trying to learn. Cheers
no
no
I Watched this and still didnt understand :(
Now, imagine if someone would invent a logic probe with a buzzer as well as a display showing frequency or low DC voltage instead of dinky car repair stuff. It would actually be a tool for electronics repair.
Logic probes made a lot more sense in the days of discrete digital logic chips. Today, a DMM works great to check voltages or measure frequencies, which a logic probe wasn't great for doing. And since everything is connected with a serial bus like I2C or SPI, then you end up using a scope or logic analyzer anyway.
I've seen one or two open source projects that tried to make an updated logic probe, but they never caught on.
@@bald_engineer they would be for repairing what can be repaired, i.e. 1970-2000. After that, you need glue solvent and a microscope. In this video, you troubleshot a circuit of discrete ICs, but you had to switch to a different piece of test equipment just to measure a TTL/CMOS voltage or frequency. Nowadays, displays are small enough to fit in a pen that could do what the logic probe does + those two things. And generate a range of different signals for fast/slow frequency, two pitches for Vcc/floating/GND, etc.
Soldering station are still made for these old THT and discrete components, and still sell. They are of no use for 21st century glued devices.
In that light, there is still a need for a handy piece of test equipment like I describe. It would be much faster at achieving what you do in the video. 👍
@@ScoopexUs Again, do some searches. There have been open source projects that try to make more useful logic probes.
@@bald_engineer It's difficult to search because of all the car mechanic trash spammed.
On TH-cam, people repair computers, and I'm hoping for one of them to showcase an actually efficient tool instead.
If I were to make one, I would buy one with a buzzer and find a voltmeter+OLED and frequency meter+OLED and print a case for it (or maybe there's space to jam it in there and cut two holes). There would be something no-one has thought of before that everyone (who repairs computers) wants.
What I did have to search for was the DMM acronym. People don't use analog multimeters anymore. Well, since my 50yo teacher 30 years ago. If you would have called it a multimeter it would be understood immediately. It's a multimeter. ;)
How to use a logic probe: First, grab a $2200 DSO....