Discrete Transistor Constant Current Source Circuit

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AllAmericanFiveRadio

8 жыл бұрын

Пікірлер: 39

@phano6385 7 жыл бұрын

A project of mine is going to use an RGB numeric display. I was puzzling over how to keep all the segments a steady color as the numbers changed and segments go out and come on. This is a delightfully simple solution!

@astorina 3 жыл бұрын

at 5:23, the words are inverted, it is the other way around, the right meter is for tension (not for current, tension which stay constant) and vice versa .. aside that , great demonstration that helped me a lot to understand

@AllAmericanFiveRadio 3 жыл бұрын

Dyslexia

@AThreeDogNight 6 жыл бұрын

That's a very well designed & yet a simple circuit for driving the LED's. Thank you for that circuit.

@AllAmericanFiveRadio 6 жыл бұрын

Thanks

@DKoppJr 7 жыл бұрын

I enjoy your videos more and more. Great Video.

@AllAmericanFiveRadio 7 жыл бұрын

Thanks

@tectalabyss 8 жыл бұрын

Thank you Rick. All my best. Bobby

@AllAmericanFiveRadio 8 жыл бұрын

Thanks

@jstro-hobbytech 2 жыл бұрын

Great videos. I love that prototyping board. I've been searching for one at a decent price because I don't think they're made anymore.

@AllAmericanFiveRadio 2 жыл бұрын

Thank you, and your welcome.

@boybravo689 Жыл бұрын

Thumbs up done sir

@AllAmericanFiveRadio Жыл бұрын

Thank you, and your welcome.

@adamdmer 7 жыл бұрын

Good video. Thumbs up!

@bundylovess 8 жыл бұрын

Nice video big thumbs up

@AllAmericanFiveRadio 8 жыл бұрын

Thanks

@tonyperry6702 8 жыл бұрын

Rick, How do i check the capacitors at the end of the IF transformers? Will the fact that they are connected to the coils affects a capacitance test? Thank you.

@danray7224 7 жыл бұрын

add a 10uf or larger electrolytic capacitor in circuit behind that 5v zener Diode & it will stabilize the 5volt circuit

@AllAmericanFiveRadio 3 ай бұрын

Thank You.

@AzriJamil 8 жыл бұрын

What is the forward voltage for the LED that you use?

@AllAmericanFiveRadio 8 жыл бұрын

One LED volt was 2.680VDC, nine LED's voltage was 1.990VDC

@AzriJamil 8 жыл бұрын

+AllAmericanFiveRadio thanks for the info.

@esnam6557 8 жыл бұрын

Thank you very much for the interesting video. Is it possible to give part no of the transistor and diode please?

@AllAmericanFiveRadio 8 жыл бұрын

Zener Diode 1N4733A 5.1V Transistor NPN TIP31

@magnuswootton6181 2 жыл бұрын

dont trust him, hes a dirty lier!

@e.h.lipton73 5 жыл бұрын

Very nice demo Sir. Could you tell me the transistor and zener part numbers, I like to duplicate this and do a little more experiment work with the circuit

@AllAmericanFiveRadio 5 жыл бұрын

Any NPN transistor will work, I used a 2N2222. Also any 5 or 5.1 Zener 1 watt will work. You can find these part on ebay. Have fun experimenting.

@e.h.lipton73 5 жыл бұрын

Thanks

@wariskn7096 5 жыл бұрын

What happens if I change led with resistor and what will be the current and voltage across transistor the load resistor and 100ohm resistor?

@AllAmericanFiveRadio 5 жыл бұрын

If the load resistor resistance is low enough the circuit will work the same.

@rubengilquinonez7273 6 жыл бұрын

What kind of NPN transistor is it? A 2N4401?

@AllAmericanFiveRadio 6 жыл бұрын

2N2222

@shvideo1 3 жыл бұрын

@@AllAmericanFiveRadio That package doesn’t look like a 2N2222?! The transistor seems more hefty?! Are you sure?! Also, isn’t 45 mA too much for an LED? I believe the correct current typically is around 20 mA.

@AllAmericanFiveRadio 3 жыл бұрын

@@shvideo1 It is a power transistor but a 2N2222 will work. Did not need a power transistor. This current these LED's run at.

@shvideo1 3 жыл бұрын

@@AllAmericanFiveRadio Thank you for the clarification. A great circuit and experiment. Really enjoyed it. Thank you for sharing.

@AbderahmanAtiya 6 жыл бұрын

Can I use this to generate a 4 and/or 20 mA constant current source !? or How could I make it using 24vdc source and what components are necessary to do so !? Thanks in advance :)

@AllAmericanFiveRadio 6 жыл бұрын

You could change the zener to about 2VDC. For 24VDC I would change the zener to 1VDC and the 195 resistor to 400. You can buy an assortment of zener diodes on eBay for not much money.

@AbderahmanAtiya 6 жыл бұрын

and that will generates a constant 4 ma and/or 20 ma correctly if I used 1K pot instead of 400 Ohm resistor !?

@AllAmericanFiveRadio 6 жыл бұрын

Put a 100 ohm resistor in series this the 1K pot