Electronics tutorial - Improving switching times - The Baker Clamp and the Schottky transistor

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#82 In this video I look at how the way in which you use the transistor affects its performance. In particular I look at what can be done to get the transistor to work faster when used as a digital switch. After looking at the problem I try some improvements including the Baker Clamp circuit and the Schottky transistor design.
SN74S00 datasheet: www.unicornelectronics.com/ft...
BC141 datasheet: www.farnell.com/datasheets/296...
Special Thanks to all my supporters on Patreon! Especially @afiskon !
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25 июл 2024

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Комментарии : 50

@TYGAMatt 5 месяцев назад

Fantastic. I was testing transistor switching speed today and it was very poor. Now I know how to speed things up. Thank you Sir

@stuartmp1974 Год назад

Such a Great video. Perfect presentation. You showed us the problem. Discussed the theory. Simulated a solution. Then tested your solution.... Perfect video workflow.

@willempje65 Год назад

Thank you for enlightning us... I was fussing with BC547 / BC557, which were way to slow switching at 62.5kHz because of saturation... The (schottky) diode Base -> Collector was a gamechanger 🙂

@Dhiman.Sarkar 2 года назад

Thanks. Nice explanation. This phenomenon has been bugging me for 4 days. Finally found the solution.

@p_mouse8676 4 года назад

Absolutely excellent video on the subject! 👍🏻 When you have to drive something like a mosfet, there is also something like a totem-pole circuit. Which can even switch faster as well as deliver a lot of current. Maybe it would be also interesting to see how these transistor circuits compare to switching with fets.

@pepperjack8 4 года назад

Very good video. I am not sure who you work for, but I hope your employer value your talent.

@FesZElectronics 4 года назад

I'm happy you enjoy my videos! Thank you!

@BaconbuttywithCheese 4 года назад

A very concise explanation of how and why without the math is refreshing and enlightening. Please do more like this.

@gwc1410 4 года назад

Very useful video with a good demonstration. You make some very good videos.

@FesZElectronics 4 года назад

Thank you very much!

@JohnDuthie 3 года назад

I'm new to all of this and I'm glad I found this channel!

@homemade83 4 года назад

OMG. i have faced a very bad experiment with this circuit before and it was such a disaster in my project and after many search and modification on board i found it won't work even with the modifications you mentioned in this video , simply because my collector voltage was to be 24v and you have to maintain a certain collector current to get better switching times and of course there was much power dissipated in the pull-up resistor connected at the collector. after all that trouble i used another ic and it can handle my 4MHz with no problems at all also without any external components. i really wanted to thank you to share this video with us and warn others from this trick.

@pieters286 Год назад

I just love this simulation hardware iterations to understand/improve the circuits. Thanks for sharing.

@lorhancosta622 4 года назад

Superb as always!

@andrewphillip8432 2 года назад

Great video, very helpful!

@WalidIssa 4 года назад

Great demonstration ....

@FesZElectronics 4 года назад

Thank you! I'm happy you enjoyed it! To be honest I noticed this turn off issue when working with the SMPS drivers, they ended up switch very slowly, so I had to limit my switching frequency to

@damianradek2817 2 года назад

Very good content. Exellent channel!

@narasimha4660 4 года назад

Very useful information in very effective method.

@SanjaySharma-pw6ww 3 года назад

Thanks for the tutorial on switching delay of bjt.🙏👍

@MIsam-fv9kb 4 года назад

Great video 👍 , I like the new wallpaper also

@FesZElectronics 4 года назад

Thanks! I wanted to try some sound proofing and came across the hexagons! They are so soooft :D

@sharana.p5921 4 года назад

Thank you so much 😊. Please keep doing videos like this. One question, are you working for any company?

@Electronzap 4 года назад

That's very helpful :)

@leofernekes343 8 месяцев назад

great video thank you!!!!

@ferdinandocostanzo7578 6 месяцев назад

Hi guys, when you download the model you need to ensure that string name inside is .SUBCKT BC817-25B 2 3 1 (like the video above) and not .SUBCKT BC817-25B 1 2 3 as in my case

@bibinlohi7805 3 года назад

Thanks bro

@michaellove7912 3 года назад

oh, man, you are awesome

@reimundolopez1198 3 года назад

Can you do the same with a phototransistor? For example, the pc817. It is that they are also very slow for switching

@DiegoColl44 4 года назад

Thank you for sharing this useful material. I want to suggest a topic for an upcoming video that I find interesting. "Array of transistors in parallel" to handle high currents. Simulate it and see its behavior with Ltspice. Again, thanks!!

@FesZElectronics 4 года назад

Hello Diego! Interesting topic, I will keep it in mind! Thanks for the suggestion!

@DiegoColl44 4 года назад

@@FesZElectronics Great..!! thank you...!! (congratulations on the style of the back wall. It looks very good! ja!)

@0MoTheG Год назад

Check out: 2N2369 and BSV52 they are true BJT switching transistors.

@user-xt9op7bu1j 7 месяцев назад

So BC549 that have 100MHz max, with this circuit can give 20MHh max?

@pbaemedan 4 года назад

Thanks for the great video, can we get the .asc file?

@FesZElectronics 4 года назад

Hello Danny! I'm happy you enjoyed the video! In most cases, like with this video, .asc files I usually reserve for my supporters at Patreon as a way to thank them.

@ElukeNL 5 месяцев назад

I guess the Schottky diode across BC also works without the split base resistor? Or is a combination of both these nescesairy? (Also: commenting for the algorithm)

@repeaterlanes8024 10 месяцев назад

If i may ask, how did you determine the necessary value for the speed-up capacitor? I cant seem to find anything about it.

@FesZElectronics 10 месяцев назад

Depending on the frequency at which you want it to act, its impedance needs to be smaller than the resistor over which it is placed; if you have a capacitor placed over a 1k resistor, and you want to "speed-up" signals above 1MHz, you can determine the capacitors impedance Xc=1/(2*pi*F*C), so a 1nF capacitor will have 159R at 1MHz, it will have a considerable impact, but the same capacitor at 1KHz has 159Kohm, so it does nothing.

@satyaprakashpatra1410 3 года назад

Great Bro, Can you please tell me which computer simulation software you are used in this circuit simulation video?

@FesZElectronics 3 года назад

Hello! I use LTspice in all my videos. Its a free simulation software

@satyaprakashpatra1410 3 года назад

@@FesZElectronics Thanks bro...

@ryanbrown172 2 года назад

What is the simulation software you are using?

@FesZElectronics 2 года назад

I use LTspice in all my videos. I also have a few tutorials for the program.

@ryanbrown172 2 года назад

@@FesZElectronics thank you for your quick response!

@biswajit681 3 года назад

I did not understand the purpose of using split resistor.could u please explain little bit.

@FesZElectronics 3 года назад

You mean in the base of the transistor? Well, one resistor is there to always limit the current, while the second one has a capacitor shunt - when a pulse is applied, the capacitor is shunting the second resistor, but after it charges, the second resistor reduces base current. The idea is to have a peak current during a transition and then a lower current after the transistor switches

@biswajit681 3 года назад

@@FesZElectronics So u mean we need to select time constant of the of the input circuit in such a way that within input pulse width capacitor should charge fully.once it fully charged then it will act as a open circuit and second resistor will come into picture and it will reduce the base current. correct me if I am wrong.