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*_This is one of the absolute BEST videos I’ve ever seen. It’s short, no annoying music, direct to the point, well illustrated, beautifully animated and perfectly described. CONGRATS AND THANK YOU!_*

Hi there. A great video. A couple of points: 1. I think your circuit explanation at 4:00 point may be incorrect. I built the circuit. As soon as you apply power, the LED connected to output turns on. That's because the BJT turns on immediately because enough voltage is applied to it's base through the "pullup" resistor path, which is also able to supply current to it's base!! This can be fixed by removing the wire that connects the collector to it's base (in the schematic)! It's not needed! 2. I had problems with the circuit at 5:52 as well. I built that one as well. When you press the button the first time the output turns on. But when you press the button again and again the output remains on. This is because when you press the button the second time (and onward), the capacitor discharges immediately through the already on second BJT (depriving you of the time you need to "remove you finger from the button"). You can fix this by adding a resistor between the capacitor and the second BJT's collector to slow down the discharge. I used a 2.2 K one that was on my desk and the circuit works! You press the button, the output turns on. You press the button again and the output turns off, and so on. With all respect, I am just trying to learn. Great work my friend. Very clever circuit as well. I loved your video. Thank you!

I've been wanting a cct like this for YEARS! Thank you for publishing. BTW excellent presentation. Keep up the good work! Kudos!!!

I love the simplicity of your design. It's simple and elegant.

The explanation of what's happening in the circuit is just top notch. Thanks!

This is almost identical to Dave’s simplest soft latching circuit from 10 years ago, but your graphics are better and you provide a real example. One thing though, you glaze over that the mosfet has to be pnp and the bjts must be npn. If people don’t know the circuit symbols then they are going to have a hard time.

I've seen several variations on this circuit concept, but I like your implementation the best. Well done! (edit: I'm referring to the final circuit you presented)

WHY. IS THIS. CHANNEL. SO. UNDERRATED?!

I love your videos; they're usually at the level that I can understand what's happening. :)

This is by far the best power saving technique. you should consider to sell this boards.

Fantastic! Best kind of videos, simple, educative, well explained and most of all very useful. Thanks for teaching us this.

Very nice little circuit. I've been using one of these in a low power flashlight for the fun of it. Works very well. Thanks for sharing! Cheers

Great work! I was wondering whether such a circuit existed! I look forward to using it in my projects! Thank you!

Was just about to design this exact circuit (vibration sensor triggered, micro turn off) for a device I'm making. Thanks for this.

Awesome job mate, looking forward to the PCB design

These are the i videos love! Good old analog circuits!

Excellent ! I was also trying to make something like it because it is a need for every low power device

Thanks for a great demo. Just what I need!

Absolutely outstanding video. I’ve had the same idea for a project, thank you so much for saving me the time and research!

Thanks for sharing. I think I will try use this for one of my projects.

Nice one! Useful circuit and very clear, step-by-step explanation.

I learned something new!

I made similar latch circuit before. Later I realized that most MCU's (atmega328, attiny85, esp8266, esp32 ...) deep sleep current draw is lower than a battery's self-discharge current. Now I never use any latch circuit. Just make sure you skip the linear regulator and power the MCU directly. The most common linear regulator -- AMS1117 -- has quite a high quiescent current.

Very good 👍 Look forward to next

this is exactly what i need to complete a project i had in limbo for a long time thnx sir

Very useful 👍. Thank you.

that is a really useful circuit, thanks for sharing, it never crossed my mind that i can use such an efficient method instead of deep sleep with esp

i really love this video, it taught me a lot

Waw this is exactly what i was looking for, thanks for the super clear explanation!!

I had something similar. May be more complex than yours but easy. I had put together with ir motion connected to rechargable batt. Maybe with timer ic s. Connected to voice chip recording went to miniature FM radio transmitter. When a car past by it would set off the motion sensor played the recording and hear it on my radio. One of my best useful projects I built that I liked. Back in the late 90 s. The motion detector was connected to fet transistor to keep power drain down when nothing happens.

Very useful video. Thanks!

Very nice job. If you want to minimize and improve I can suggest to use the IRF7317 (It is a couple of mosfet) and a couple of resistors.

Thanks for the video. Waiting for the next one on this topic

Pff... I think you made my day with this circuit... Now I have to modify my PCB and code, but it might be worth it. Thank you.

I wanted to understand everything like you introduce & solve, always 💙💙

Brilliant. Glad to be a patrion. 👌👌

EXCELLENT IDEA !! Thank you very much for sharing and explainig it very clearly . I will definitely use this in future projects for my model train layout and others

Thankyou very useful waiting for next

Very nice. Thanks for sharing. :D

Brilliant new video as always! :D (Please do more stuff with nixie tubes)

This would be great to turn into a little 5-pin module that you can just solder onto your circuit. (Power in, power out, ground, trigger - pull low to turn on, finished - pull low to turn off) Also, I already saw the circuit at 5:41 a few years ago while watching EEVblog.

Awesome & Step by step explanation❤

Super very very explained and professional keep going.

loved this one , great effort .

Perfect! This is exactly what I need for my post box notifier :) Thank you!!

Quality speaks!

Whoa amazing!

Great. Was looking for something like this.

Not just Like,but Adorable! Awesome, lovely ... Thank you

Nice job!

Very nice! Thanks for sharing!

Congratulations on reinventing Keving Darrah's Trigboard from 2018

Thanks for the nice explanation!

This is awesome video of yours man...

Excellent. Smithers... Excellent.

Many thanks indeed for the very well presented video. Just so you know people are paying attention.... Your circuit diagram has R4 = 100R but on your breadboard, it is 100k. Thanks again for the very clear explanation. cheers.....

Such Awesome Job, keep on Sir It's very useful Project ❤❤❤

Clever. I thought about this somehow and needed "advice."

the way to present it is great (let's make it like that, but then we have this problem, so let's do that, etc... )

That is a very handy little circuit!

Brilliant.... Thanks a ton mate.

Great video, excellent animation and explanation, with a logical progression of the challenges and the solutions. I would love to incorporate this into my current project that detects an IR remote button press, however unless the circuit is powered on, there's no way that I can think of to detect the IR signal. If anyone knows of a way (other than a phisical button switch press) please share!

Ofcourse we like your video.. 👍🏻👌🏻

Nice circuit Dude 👍

Excellent. Please also add a low power (programmable?) timer to your board so you can force a wake-up every hour. This would be useful for a logging application

Thank you sir very helpful

I'm hoping that you could produce such interesting, good quality design for electronics your avid fan and subscriber, thanks. Learning a lot from you, nice explanation

great work helpful 👍👍

Excellent job

Very cool!!! Thank you!

Brilliant idea You always great Noobs

Sir you are great, I wish I will be like you some days.....

Awesome 👍

Neat little circuit! This also answers a questions I had about P channel MOSFETs :) You could also do it with the MOSFET and one transistor by using a microcontroller pin to latch the MOSFET gate low via that transistor, then pull the microcontroller pin low again once it's finished what it needs to do :)

Interesting topic. I hadn't thought about it. So many new projects start coming to mind. Thanks

Very useful ! it will help me a lot.

super intresting!

Great video.

Useful!

Very useful, thanks

Muy bueno e interesante, en el próximo video, podrías de implementar que el mismo botón sirva para apagar el Arduino si lo dejas pulsado unos segundos... Felicidades!

very clever combination of digital & analog electronics to improve power efficiency

Really useful circuit , using a solar small solar panel as a trigger or a hall sensor can make for an interesting implementation

great solution

Useful one, thanks

Great video!! Good channel

Thank you sir

a very VERY useful circuit..

Very good

great job !

This was very informative. Please can you create a tutorial on how to design a pcb using easyEDA or Eagle I find it hard choosing line width, top or bottom (for double layer). Because I real like to order those pcb from your sponsors, electronics is my hobby Keep up the good work bro

Very good!

Thanks for this, very handy circuit. Did you ever make this using small smd components?

Thank, very helpful video

that was a great video u never disappoint us!!!! , I just have a question doesn't the vibration sensor consume power while it's plugged with the battery (or is it that negligible??) or we just make that latch to avoid powering the arduino at all time?(sorry am new to electronics)

Thank You

Nice .... Superb... Very useful... 👍👍👍🙏🙏🙏

Very helpful video! I was looking for something like that! Maybe the ON signal can come from some sort of timer every 12 or 24 hours?

Wonderful