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"Awesome tutorial! Your step-by-step explanation on circuit simulation in KiCad was super helpful. I’ve been struggling with SPICE integration, but you made it so clear. Looking forward to more videos like this-keep up the great work!"

I have always used LTSpice for simulation and then had to redraw everything in KiCAD for actual design, because I was never able to figure out how simulation works in the latter. Now I know, thank you!

Does TOMLOV DM10 has PC conection? like HDMI/VGA ? Noticed same microscope and same pictuure you displayed in this video on the site you bought, and someone there says "is the only minus for this microscope that does not have PC connection"! But how did you record this video so clear? With SD Card? thank you!

This was extremely helpful. Thank you! I have been stuck on this for days and your video helped me find a circuit that works for my side project.

i hope im not going to sound stupid; im new to electronics and i want to learn as fast as i can everything there is to know so im not left behind, but i have no idea what this gentleman said after he started talking about SPICE. do you have any advice for a noob who wants to learn everything to do with (high voltage / low voltage / ELV) as fast as possible?

Awesome video! Keep them coming.

Very cool. Possible to talk sometime? I work with Mike on QSPICE.

I am always happy to see your use of QSPICE in your excellent tutorials!

Is it possible to get the MCU or firmware somewhere? I destroyed it through my carelessness. 😒

This is pretty helpful, thx!

Same experience, 3 "charge 5" failed, 2 changed, 1 paid again. Charge is a great device for the money thats why I insisted. Finally opened it the one I couldnt change with Google, like you and found the same, even worst, and it is un repairable. What i did with the last new replacement from the store is : 1) never expose it to water, 2) spray liquid silicone in the glass border in order to penetrarte and to generate a protective layer in the seal. When spraying is very evident the way that silicone penetrates the border seal, fotunately it dryes very quickly.. I don't know if it is then ultimate solution, I will know only with the time. By now keep I spraying with liquid silicone every 1 or 2 months.

Great video - would love to see a bjt video too!

are the schematics created compatible with ltspice?

They really need to be sued

Is that linux?

I'm a dog groomer. My Charge 5 screen quit working after about 11 months of use. Fortunately, i purchased the 2-year protection plan when i bought it from Amazon, which covers even issues that aren't covered under the manufacturer warranty.

windows only. Qucs is more universal.

Spent less than 5 minutes in ocean on Kaui, Hawaii thinking that it was waterproof to a reasonable depth! Bad move on my part! Very salty water got in...now it's toast! Wife warned me...I didn't listen!

Nice 🙂 Waiting for the simulation video 😊❤

My station from 40 years ago used the same circuit, but the digital voltmeter used two ICs, One the ADC and another was the BCD to 7-segment decoder/demultiplexer. It was, and still is, an analogue device at its heart...

All these chinesium companies change their name every few years to avoid honoring warranties. they all sell the same exact products and act as cutouts.

👍 great job 🎉

Good refresher, very nice explanations

Keeping Notepad++ alive. LOL. After 40+ years of writing code, my old eyes can't do "light mode" anymore. Dark mode everything FTW. Thanks for the excellent video!

Took my charger 5 to the pool for the first time ever about 3 weeks ago, first time ever. The pool isn't even 2m and I only swam surface level. When I got home the screen started blinking white. So yep, they are such a failure when it comes to water. Thankfully my warranty covered it and I got a refurbished one from them.

Excellent Job. Thanks! I am a Principal FPGA designer/digital EE. But, I was just forced onto a project where I needed to miraculously become an Analog EE. This helped out immensely for the project. Thanks.

My Fitbit Charge 5 also got slightly wet while submerged in water (hot tub) for about a couple of minutes. I had it for 1 year-10 months. Working with customer service was frustrating. I never received the email they were supposed to send me to offer a discount on a future purchase.

Thank you sir! Your videos have made learning CircuitMaker so much easier - I was struggling until I found your tutorials - I really do appreciate all the effort you have put into your videos.

I also had my fitbit charge 5 for 1 year 6 months. After this time period, I thought it would work in a pool. I found out after my short time in the water, that the watch died. I did everything to dry it out - Used a rice bag to dry it out with no luck for 2 days. I tried to charge it and no screen picture. After waiting several more days and caller the help center and listening to many videos on how to dry it out. I decided then to try to open it and dry it out. Not a good idea. It took several days to just try to open the screen and still didn't work at all. Now I just have a broken watch in pieces. You are correct. NEVER EVER PUT A FITBIT IN WATER. Yet I also read a fitbit life is about 2 years.

Your assessment is 100 percent correct! Two fit bit charge 5 models in my family. Never been used for swimming. Both got wet when they were submerged in a foot of water for a few seconds. Both failed due to water entering the units. Thanks for the video. I am going to take apart the one that just failed and look inside.

Some of the "crusty stuff" youre seeing is flux residue from the soldering process, which is normal, but I agree that the stuff not on a solder joint is likely corrosion. Here to say me too, mine just failed 2 weeks out of warranty. I've never taken it in a pool. Saw moisture in the little sensor windows after it started boot-looping. Other than that it was a great device in life. RIP.

Happened to my wifes, she was just floating in a lazy river for one lap before she noticed it doing funky stuff. Unacceptable Fitbit/Google.

HSPICE came from MetaSoft. The founders are Hailey brothers (hence the letter "H"). Meta was acquired by Avanti, who later bought by Synopsys. Spectre was developed by Ken Kundert from Cadence. There are several other commercial circuit simulators in the market. But you are right, let's focus on the free and open source SPICE simulators for education and self-learning.

Thanks for including QSPICE in this comparison!

I want something that runs unit tests in GoogleTest against a spice simulator. I have realized though that QSpice needs to be the thing that "invokes" the C++, but I would like it the other way around. I want GTest to be able to load my test fixture (whatever simulated hardware that looks like in spice) and connect it to my source code and run scripted simulations. So far I have not been able to find anything like what I want. Can this do that? Does QSpice have a command line interface?

Michael Thomas Engelhardt was born in June 1953 so ... He's ... 71 years old !!! Well well

Awesome tutorial !.....cheers.

Very true. Same thing happened to my Charge 5. It's not water resistant at all. (((

Thank you for making this, The small details you mention saves my day, Again thanks ........

Same just happened to me it's about 10 months old I swam with it many times prior to this incident blindly believing that is water resistant however it leaked and now it's not working on the bottom sensor screen I can see a significant amount of water droplets so I would say a big amount of water got in how is that even possible i was in a shallow 4' deep pool. Anyway I was lucky it's still under warranty but once I get new one no more swimming with it quite disappointed about quality of it they claim it's water resistant it clearly isn't.

Thank you for this video ! No online DRC ? Good to know

Can you please pinpoint (with a time code) where you answer the title question: "the *best free* simulator"?

What would need to change if the load resistance is much lower? For example, a speaker that is only 5 ohms. Great video!

I’ve also had the same happen to me in very similar circumstances. About to receive the 2nd replacement (within warranty). Was wondering if I can better the factory waterproofing in any way. I can take it apart and put it back together but wondering where the water gets in from in the first place. I took apart the failed units and couldn’t tell.

Thanks a lot! Explained very well and not too long or too short.

can you design pcb from this circuit?

This is very helpful to a complete noob to electronics like myself. Thanks for sharing this!

Just back from the swimming pool and my Fitbit charge 5 isn't working anymore. I guess it's not waterproof!

Great little tutorial. Coming from cad this is an excellent length.

I can confirm that this happened to me too. My Charge 5 failed on me after using it in the shower for 3 times. The screen is now flickering yellow and unresponsive. It just crossed its warranty last month and now it's dead. So much for your waterproof claim, Fitbit.