ebay Logic Probe Kit
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- เผยแพร่เมื่อ 3 ต.ค. 2019
- I showed this kit in a past mail bag video and with some troubleshooting needed on my cpu build now was an ideal time to make it.
Mistakes were made, some led's were injured during this video. The kit survived.
Logic probe kit: www.mitchelectronics.co.uk/pr...
Their video: • MitchElectronics - Log... - วิทยาศาสตร์และเทคโนโลยี
I put the headers on the wrong side of my TinyPICO side-by-side. I learned just how useful a solder sucker is. Thanks James.
I should get one, do you have the plastic plunger type or the new flash mechanical pump type?
@@weirdboyjim the aluminium pump types that are very common are OK but not great. I got a famdabbydozie big plastic pump type from m.reichelt.com/de/en/desoldering-pump-high-quality-version-elp-kunststoff-p96333.html which has, literally, changed my life.... so worth the investment... get one now while importing stuff from Germany is still affordable.
If you look at the schematic, the resistors used for the green and red LEds also form a voltage divider used to get half of Vdd so it can be compared against the output of the first NOR gate (wired as an inverter, or oscillator when the pogo pin is floating), so changing just the resistor for the green LED may cause some unintended changes in the functionality. (It's probably within tollerances, though.)
I might have a go at designing my own one some day, I've had good use out of this.
I don't have a sucker either, I always use solder braid to clear the holes which works pretty well for me.
Braid is ok one you get used to it, but one of those electric suckers would be useful occasionally.
I think this little device would be a lot more useful if it had the option to generate 2 different 'tones' via a small speaker for logic LOW and HIGH. Exactly like the continuity test on a multimeter. Would make a fun weekend project with a bit of DIY perfboard.... ( buggers off to find that 555 timer based sound schematic he read about last week..... )
That might indeed be useful! If you get it working, I definitely wouldn't mind seeing schematics :)
It's interesting how simple projects can get the ideas flowing. While building I was thinking about making one with a microcontroller and a small lcd screen so I could detect frequency and duty cycle. Would be nice to have a button to collect a bit and shift it so you could have a hex display of a bus.
Another awesome video. Excellant that you also showed the full adventure of assembly, mistakes and all. Certainly a good demonstration of how hard life is without a desoldering tool! As the circuit is CMOS (high impedence) you'd want to be careful not to touch the circuitry while you are holding it, or you'll likely get some unexpected readings. :-) As a suggestion, you could use some heat-shrink tubing to encase the board, at least up to the LED's (ie. the part where your fingers hold it).
Thanks! Interesting idea, I'll have a look to see if any of my heat shrink is big enough.
Just curious, why do you prefer using the breadboard to hold your pcb during soldering? Why not always use that vice that you use at 11:00 to hold the pcb and some tack or leg bending to hold the components in place during soldering?
This is one of those situations where anything I say would probably be post justification. I used the breadboard because that is what occurred to me at the time, it's how I did everything before I had the pcb holder and I usually have a breadboard in easy reach. I can add a couple of other bits of quality rationalization, not least that I'm used to working at the height of my desk, the holder lifts it up which makes it a bit less comfortable to work on. This was also a very thin pcb, so I'd either be moving it around lots or have limited room around the grips.
LOL... I know I wasn't supposed to, but I couldn't help myself. To err is human. Now I know you're not a robot!
Lol, this channel contains plenty of that proof 🤪
Nice work
Thanks Mark! I use that logic probe in quite a few of my videos!
@@weirdboyjim I noticed that! They are currently unavailable, I’m going to keep an eye out for one.
Have you found any low-cost cases for a logic-probe-sized project?
What about an e-cigarette body?
I don't know what dimensions they have. Would it be about that big?
My comment earlier in the video about maybe soldering the chip directly was because the chip in socket stands proud of the led's. I had been considering trying to throw together a quick design for a 3d printed case but I used up my available time with the rework.
Interesting idea, I assume you are talking about the kind with a long thin battery.
@@randomelectronicsanddispla1765 The simplest e-cig body is just a metal tube housing an 18650 battery (18x65 mm), and those tubes would usually be 22 mm in diameter externally. Probably 20 mm internally. It's hard to tell the exact width from the video, but it looks like this board might indeed fit quite nicely in one of those? Might need some padding.
I remember a similar project in a magazine from decades ago.
I believe they suggested using the the body of a disposable syringe for a case
Back when I did electronics as a kid, a logic probe was always something of a luxury item.... these days I tend to use my cheap as chips logic analyser.... but, watching this video, I'm wondering is this logic probe would be handy.... and it's under a fiver which means they've lost their luxury item status over the years.... hmmmm - may give it a go.
Indeed, obviously very basic but I've used it enough now to know a quick logic level test is handy.
Hi, could it be possible to have the schematics, thanks.
This is not my design, it was a purchased kit. The Vendor www.mitchelectronics.co.uk/ makes a few kits and provides excellent assembly instructions that explain the operation. You can get the schematic and a good explanation of how it works from the assembly instructions here: www.mitchelectronics.co.uk/documents/LogicProbe.pdf
@@weirdboyjim Thanks very much, will take a look.
3-12 volts?
I've only used it on 5v