Build A Cheap DIY Signal Injector Pen Useful For Electronics Fault Finding - In A Pen!

[@dedr4m]

I'm roughly 15:30 into the video, for a lithium cell that would fit in those pens (They're designed for this purpose) is the batteries that look literally like capacitors, Search, "huahui new energy 3.7v li-ion". The model I got is the HCC7240 version salvaged from a broken graphics tablet.

[@Hellhound604]

This video takes me back to the 1970’s, whilst in school. Built myself a signal injector/tracer just a bit larger than pen size, had to fit a PM-9 battery, lol… served me good for many years.

[@1974UTuber]

Instead of making a circuit board, you could have easily done P2P wiring of the small parts and sealed it in resin in the pen body. Perhaps a AAA cell would fit in a thicker pen. Although that doesn't work well with the sponsorship deal

[@gordonemery6949]

I joined 4 button cells in series with heat shrink tubing,worked well 👍

[@gd2329j]

I made one of those 50 + years ago . Back when projects never fitted the intended inclosure ! Its fundamental frequency was 400 Hz ( +/- a lot ) . But had harmonics up past 40 Mhz the mark . Using salvage parts did the +/- a lot thing & don't help reduce case sizes ….

[@jorgealzate4124]

This video brought me so many memories. I still have the signal injector I built when I was 14 inside a syringe, a true signal injector 😂

[@romancharak3675]

Hello Richard. When designing the PCB, you might want to place the Push-Button switch on the board, somewhere closer to the front tip of the pen, for easier access when probing. I'm looking forward to seeing your design.

[@LearnElectronicsRepair]

Thanks, I also want to include a battery holder clip on the pcb too if I can. 😉

[@eddyyu7091]

I've watched your 2 videos about making a tracer and injector. Although they're not so hard to make but I think they're so useful to our everyday use. Good job !

[@robtitheridge9708]

if like me you work on a lot of vintage AM radios a signal injector is one of the most usefull tools you can have but will need a high voltage cap feeding the probe the more harmonics it produes the better will work right up to RF .

[@NicksStuff]

PCBWay sponsors virtually all your videos. ...have you considered designing a PCB for these circuits? That would be cool

[@MostlyPosative-nj5ex]

Nice work. I got a few woulda, coulda, shouldas for you. The button: a plastic bolt or something else coming through the other side of the ink pen housing could have made pushing it up into position easy for you. The battery: I would have tried using a cell out of a 9v battery for that, maybe even 2 may fit into it. You could easily soldier to the welded tabs. I didn’t quite understand how the receiver was made. It seemed like you built a prototype circuit board and then switched to something else at the end. I didn’t see how that was made. Just my two cents.

[@Dutch_off_grid_homesteading]

heya, that is a very nice DIY project and nice tool too have

[@hernancoronel]

At around 29:00 nice opportunity to review some spot welder from aliexpress, banggood or similar provider.

[@LearnElectronicsRepair]

Well funnily enough, and I did mention in the video - I have a spot welder which I reviewed a few months ago but I loaned it to Carlos from Retro Upgrade kzbin.info/www/bejne/qX-tmHR_odurg68

[@cajuncoinhunter]

Did you ever design a board for these ?

[@garypoplin4599]

33:45 - Why don’t we ever say, “Miss and hit”? Because, we got it right in the end, didn’t we?

[@loverofthelostnarc]

I'm just new to this and I understood it well but can you explain for what is the other probe for.

[@davidgrey943]

Thanks for giving up your Sunday to build the signal injector Changi g the subject I was watching one of your videos dealing with internet streaming devices and using 5 volts instead of 12 volts. I am surprised they they had not included some undervoltage protection of some kind overvoltage protection on the 5 volt model for the same reason for people pluging 12 power packs into a 5 volt device. By the way I am enjoying your content.

[@LearnElectronicsRepair]

I responded to this same question several times on that video, so you can refer to those comments for more detail - but basically, as the supply voltage is decreased the pulse width (on-time coming form the buck controller) increases to maintain the output voltage. If the circuit designer selected the inductor to work with the correct input voltage and if the inductor then saturates before the supply voltage gets low enough to trigger, the UVLO protection will not save the buck controller.

[@tjohnson4062]

Did you cut the piece with vice trips or what.... button cell 357, a pen light with a modified light end might be easier. What would be interesting is using one of the multicolor lens with different functions with the ink selectors. I'll have to think more on that.It's

[@carlospenalver8721]

Nice project, couldn’t this be done with one of those cheap laser pointers if you replace and configure the laser diode with a pin tho?

[@daz41262010]

great little project Richard :)

[@akierum]

Why not use the KAIWEETS KM601? Did it broken or what? What other 40Eur multimeter can beep in diode more? Very hard to find with this feature.

[@eddyyu7091]

What is the model of the transistors you're using, sir ?

[@henrybartlett1986]

As usual, great stuff.

[@AndrewDinic-fr3zm]

Hello Has PCBway printed a board for this Project yet?

[@hernancoronel]

What an artisan job Richard! Thank you for the video, I really enjoy these DIY cheap projects!

[@LearnElectronicsRepair]

Good to see you liked it. It was a challenge I set for myself, and a lot of fun too 🙂

[@aronhighgrove4100]

23:30 Are you in a school or some other public area? There are suddenly so many voices in the background.

[@Mark_C1]

I know it’s cheating a little but I’ve heard of this place called pcb way and they might be able to make a board that would fit. Don’t know if you’ve heard of them? Possibly with a neg contact plate for the button cell and a hole for a diy wire arm for the positive. Also button up closer to the tips gotta be nicer ? Lovely project, Richard. Making me want to get the Vero board and components out and play 😁

[@Mark_C1]

@@Bobo-ox7fj also you can upload your designs and receive a commission on them as s creator. They do pens too 🤷‍♂️ Winner winner 🐓 🥘 “other manufacturers are available”🤣

[@djisydneyaustralia]

Your wife must love that sound, probably calls you a wizard harry, with that magical wand...

[@edwinwaugh]

well done

[@davet3804]

Nice one .why were you not using the scope you reviewed yesterday?? Fun to get back to good old projects

[@LearnElectronicsRepair]

I recorded the first part of this video before I received the FNIRSI scope - don't worry you will see more of it in future 😉

[@andymouse]

Nice !....cheers.

[@rahulmechatronics]

hi i am not able to join discord server

[@LearnElectronicsRepair]

What happens if you try the invite link? discord.gg/vam6YC8vwU

[@rahulmechatronics]

@@LearnElectronicsRepair I am getting unable to accept invite

[@keithking1985]

Nice 👍🇮🇪🙏🏼

[@Blinkerd00d]

My wife has heard me say, "why can't I grow a 3rd hand?!" for years now lol

[@LearnElectronicsRepair]

Actually I think men will evolve three hands around the same time women evolve three breasts 😁

[@Blinkerd00d]

@@LearnElectronicsRepair tits possible

[@Michael00172]

I was born with '3 legs' LOL.@@LearnElectronicsRepair

[@larslindgren3846]

Is it sponsored by pcb way or veroboard?

[@LearnElectronicsRepair]

Ahhh now it works, in part two we are going to design upload and order the prototype PCBs

[@MrSpaz12]

There's a German? Or maybe he's from Spain? Anyway, he's been working with pcb way making FLEXIBLE PCBs. Just thought I'd throw that out there. I'll look his channel up later and edit this post with the link. But first I'm going to finish watching your video.

[@MrSpaz12]

youtube.com/@CarlBugeja

[@electronicrepairservice2020]

Maybe you could actually show this in use with a scope?

[@frogz]

hackkkkkkkkkkkkkkkkkkkkk that is a reverse bodge, that is removing wire where it formerly existed!!

[@fullpower8382]

Geiler Typ! Ernst gemeint!!

[@666kty3]

WHATS THE POINT? WHY NOT JUST USE A FUNCTION GENERATOR WITH A BNC PROBE?

[@LearnElectronicsRepair]

Because it's fun? And anyway, what if you don't have the money (due to socioeconomic conditions in your part of the world ) to buy a function generator or BNC probe? And why shout?

[@Michael00172]

Some folks are 'deaf'.@@LearnElectronicsRepair