Interesting video that refreshed some of my forgotten knowledge...

Very good up to date design, direction and narration. Thanks.

Great video, I'll watch it 30 times to understand because its so densely pact with information.

Amazing explanation as always, and effective deasine

Zenner diodes if used for very precise control voltages should have a 100nFceramic capacitor in parallel to eliminate some of the zenner noise. Zenner noise is worse at low current and a zenner should never be used at less than 10% of it's rated working current (this would cause voltage tolerance issues too). Also R1 in the transistor only current regulator should be selected to have approximately 5% of the current flow of that required by the whole circuit - this is because the hfe of a medium power transistor is rarely over 50 (sometimes as low as 20) for medium currents (a bit more at low current) and by medium current I mean medium with reference to that particular transistor. EG a medium current for a 5A part would be 500mA. Low current would be 50mA and high current would be 1A+.

@PhG1961

6 жыл бұрын

Interesting and usefull reply ! Thnxs !

@caeiranir-dk4rw

4 жыл бұрын

hi, in last circuit how to calculate R1?

@kennmossman8701

3 жыл бұрын

ZeNer not Zenn-er Zeners are not for precise voltage references. The noise by the Zener is usually trivial except in high-gain audio circuits or such.

@grahamhall2662

Жыл бұрын

They are using an TIP 142 which is a darlington with hfe of 1000. Makes a nonsense of your theory.

Really nice! 😊

Thanks for high quality circuit.

Ha! I just realized I can use the unused half of the LM358 op amp on a cheap VC288 Volt/Current meter to create an adjustable current limit.

Ty for the tip, I will enjoy it in my project ;)

Hi, I have a question about the first circuit with two transistors and resistors. If the source voltage drops down the load current will be constant or not?

This circuit is working, thanks to the developer 💯👍💐

Can we add this to lm317 variable voltage supply as variable current setup?

hi. very good and detailed information. thanks. can you explain a lm358 ampare control circuit for buck or boost converter?

Awesome video i Like it 👌♥️👍👌😀👌♥️

could you please explain how LM358 schematic works? It is not functioning as in video, inputs 2 and 3 have different voltage and it is not changing by potentiometer. And mosfet is open. Always.

So in essence if you're running up to 1A it's better to use a resistor as a current limiter rather than a current limiting circuit? If not what am i reading backwards?

Is it possible to use a potentiometer on lm317 circuit? It would make a good current regulator for a variable bench power supply.

@kennmossman8701

3 жыл бұрын

Bot in the circuits shown. The current is too high. There are other circuits............

I use lm358, when i set pot to zero why i still get 1amp? And why not getting 0amp? Can u help me?

Mantap gan.

pls can you make an video modyfijing that kit from chine at 0:34

Sister u have make an usb killer previously can u sam me the small little transformer calculations 😊😄

filament bulb in 2018?

Can i use 2 pieces 3205 mosfet... from lm358 output pin parallalaly to increase load current upto 6amp...??

Thank you for refreshing my theory. Best wishes, BRIAN.

Thank you!

I love you guys

Please post variable frequency controller for power motors

Yeah those boards are good for driver circuits but if you deal with currents 20A+ those PCBs are fried (thin copper tracks). Whole art is laying out those power elements.

What transistors should i use if i want the voltage be up to 50V

@oskarsabo

5 жыл бұрын

Look after transistor datasheets. I think 2sc5200 transistor can handle 50 volts

CAN YOU CREATE ONE HIGH SIDE WITH N CHANNEL ?

Hello, very nice video ! i did the same, i used 1.5 Ohm to have an output of max 1A, but when i plug a load to my 12v lamp bulb, the voltage drops to 4v, is it normal ? many thanks.

@nhuthoanghuynh7833

Жыл бұрын

that is due to your set current limit

Thank you..

How low can you set the current? Can it be set to 15ma?

@youvebeensubbedto8009

5 ай бұрын

I'd recommend checking out the datasheet for these devices. They usually provide a current range chart for operation.

Very nice

VERY very useful

The circuit is very good, but it would be better with a current limit indicator ... Maybe a led indicator

Thank's.

good explained

Very value

Pls can you make a sine wave inverter

@varaprasannakumaryeggati2448

4 жыл бұрын

Ji if you got it can you say me

Thanks 👍

Why do your pcbs resemble like the ones in 1980s

Hello, Can you guide me for limiting the output current to 350mA of a power supply (with output 250vdc, max output 15Amp). Should I simply add 0.22 Ohm 10W (9 Resisters) in Parallel before load?

Your videos are educative. Thanks. You mention JLPCB in your videos but the PCBs you have shown in the videos don't look like professional ones from JLPCB. Why is this?

what if the input voltage is 220Vdc and the current that i need is 1amp can you help me. for the components needed to change thankyou!

my linear dc power supply 30v 5amp not increasing current above 2 amp and if i rotate full it shows 2 to 3 amp and when i connect load resistor to check current it slowly increase current upto 3amp and above but at that time my power supply 2n3055 get short what will be the problem?

Big like 👍 👍 👍

How calculate rx value

@mohammedjawadforelectronic9190

5 жыл бұрын

Rx=1.2/I

hi, in last circuit how to calculate R1?

@kennmossman8701

3 жыл бұрын

R1 ???

I'm hoping to find a way to regulate my 36v lipo to a discharge rate not to exceed 30amps

can i replace power transistor with mosfets

alwayas good

Why to use a shunt, I use a transistor with Low gain and feed the base a constant current using a resistor like 10ma and get 100 gain so 1A out.

❤❤❤❤❤❤

I am making 24v 10ams smps my output is 410mA I want to increase current at 10 amps how I get 10amps in output without Changing voltage

don't work number one in proteus hmm...

lm317 dosent work with transistor.

hi

like

Reply me

this is not understandable

very intresting