Making a FET Phase Light - The Learning Circuit
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- čas přidán 27. 11. 2018
- Today we’re going to use MOSFETs to make a phase light. For this project, we’re using two n7000s, which are n-channel MOSFETs. Connect with Karen on the element14 community: bit.ly/2SegofN
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Love these projects, Karen!😊👍
When we power up the caps charge. Once they are charged the gate opens MOSFET. This makes the next cap to discharge. After this we go through a cycle of charging and discharging which makes FETs open and close and this makes the blinking effect?
That's really cool. I might try making a "firefly jar" type effect out of this kind of circuit.
Dude cool.
I hope it makes it to season 2...
For some reason, the light sequence reminds me of Close Encounters of the Third Kind, and the orb makes it even cooler!
Many Thanks. ...so sweeet and Coooooool v practical circuit, Karen.
Neat circuit. Thanks Karen.
Great circuit and practical fun application.
Cool project! I like that it does not use a microcontroller like so many other projects.
I try to keep circuits simple so it's easier to figure out what each component does within the circuit. With microcontrollers, it always feels like it's all in the programming.
As one mosfet gets turned on the next one downstream turns off because the one meg tied to the drain discharges the downsteam capacitor. Then the cycle repeats round and round. I think this is similar to a ring counter.
It’s beautiful.
Great circuit, thanks. The led turn off because when the next LED turns on, the capacitor discharges through its mosfet via the 1M resistor. The zener diode on the mosfet is just optional circuit protection?
Hello...
I wanted to know the working of this circuit in detail for my project..... Will you please help me ....
What i wanna know is if we can add more LEDs of varying colors for a trippy effect.
Damn, I can't even understand why the LED light on one by one and not the 3 of them at the same time since they do the same exact loop. Any hint?
RED needs 2.0V to make ON, GREEN need 2.2V to make ON, BLUE needs 3.5V to make ON. So, the 3 LEDs will not be same color. If they are same color, they will just blink at the same time. This is just manipulating their forward bias voltage.
Looking at the circuit I keep seeing first green turn on (lowest voltage drop over red led), then red then blue... Cant understand the red-green-blue though...
Hai. I cannot able to understand how it works. Can u help me out
The led turn of and on bcoz of capacitor when it's fully charged its create an open circut forcing the led to dim or turn off
How works one mosfet it simple, why its fading, because cap losing charge slowly, I think, but how works all three its more complex =)
c1 will charge first and then as it discharges c2 or c3 will get charged and as say c2 charges and discharges c3 and c1 would try to charge and c3 should win as it had accumulated some. each capactior as its charges causes its mosfet led to light up.
I am guessing the GATE on the MOSFET depletes the capacitor attached to it.
That would be true on a Bipolar Junction Transistor (which look similar and call the Gate a "base"). However, on the MOSFET, there is no flow of current through the gate - its triggered by voltage differential only; thus, the "field effect". There's discussion at the e14 link starting (bit.ly/2SegofN).
Where could I salvage those mosfets from?
You're better off buying them from China, they are really cheap. Even if you could salvage them from a circuit, they wouldn't be usable on a breadboard or a protoboard.
Great circuit!
Hi, I've made the basic circuit but when I tried adding a fourth it all died. Why's that? 😕 Thanks.
i did tha same but fail same as you. way tha circuit should work 😕
once the power has passed through the 3rd 1M resistor the voltage is too low. Change power supply to 9 volts DC IMPORTANT remember to change the values of the resistors located at you LEDs. I used 470 ohms to replace the 330 ohms. Set up 5 phase shifting circuit.
Also this circuit can be used as Knight Rider just have to make it with more then 7 LED's
Evening, Would this work with PN2222 transistors
I was wondering the same thing, too bad she doesn't seem to answer questions here
I need to learn the basics , know a video that could help me
Everyone learns differently: but a channel i like is Afrotechmods it helped me with some of the basics I didn't understand. I hope this helps.
А, если сделать чтоб 5 светодиодов переключались-как это будет реализовано по этой схеме?
Thanks, Karen!
It's got to do with capcitooootrs charging and discharge stuff.....Thanks karen
It only works for an odd number of LEDs greater than 1.
Why?
you need to add a 100 ohm resistor between the cap and the gate to prevent the fet from becoming an RF modulator due to the inductance of the source wire. The resistance works with the feedback and gate capacitance to lower the gain in the Mhz to Ghz range.
its remind me of japanese bamboo water fountain
Great vid Karen, beauty and brains!
Making
Feedback.
hi is this an Ai
YAY More Karen and science so... double Yay!
As someone down below mentioned, one of the LEDs is most likely to turn on initially, due to different characteristics of blue, green and red LEDS. The LED turns off when the capacitor is discharged through the FET to the left when it turns on. This discharging / charging effect “ripples” around the ring.
Couldn't you make this with just a single RGB ,asking for a friend,lol 👍
Just in time to hack my Christmas lights.
when it drops to 1m ohms thur the resistor
You're hot , a beautiful voice, and you can actually build circuits
I got to be dreaming anyways some reason CZcams presented another one of your videos and I might build one if I see you do an electrolytic mic amp circuit (idk why that just seems to be my fascination right now)
When pronouncing Mega-ohms, it's proper to drop the 'a', and just say Megohms.
Dan, I think you might be Joshing us.