Dear Mr Lewis, Thank you for such a wonderful lesson. I managed to finish my masters project with the help of this knowledge..!! Thank you again.
@LewisLoflin2 жыл бұрын
You are why I put this information here. Good luck.
@jimjohnson68577 жыл бұрын
man I was stumped in my project until I came accros your video! thank you for being smart sir and for your videos! I appreciate them
@youssefyoussef43686 ай бұрын
That's what I've been looking for.Many thanks🙂
@jabittar5 жыл бұрын
Outstanding. Very thorough presentation in a short period of time.
@cameronmalchow18373 жыл бұрын
Thank you so much for providing this lesson. I tried getting into Arduino years ago, but didn't have an understanding of how even transistors worked, or how they were special. How that figured into CPU design and other applications. Now I'm slowly building on that knowledge so I know how the chips and boards work, aside from the actual ATMega328 and the way it is programmed.
@wolfgangboettcher31263 жыл бұрын
Arduino Uno 👍
@wolfgangboettcher31263 жыл бұрын
Schön jemanden zu treffen der gute Ideen hat
@wolfgangboettcher31263 жыл бұрын
Thank you
@tomcarlson39133 жыл бұрын
It would be interesting to see some linear opperating mode optocoupler circuits. I believe hotchassis TVs used to use optocouplers for AV input isolation, and switch mode supplies using optocouplers for feedback of output voltage levels to the primary side controller. It would be interesting to see the schematics of such circuits.
@hegez20067 жыл бұрын
great explain thank you Mr LEWIS
@agstechnicalsupport Жыл бұрын
I enjoyed watching. Great, instructive content !
@BrainFix0007 жыл бұрын
Excellent, thank you. I will definitely be checking out your other videos.
@LewisLoflin7 жыл бұрын
Thanks.
@wolfgangboettcher31263 жыл бұрын
Ja ,etwas in Richtung Perfekttransistor ist egal Tip npn oder PNP ,OK auf jeden Fall richtig
@Ammy-bc6bh Жыл бұрын
Beautiful. Its all about to isolate the load that is driven by the arduino command. But what input isolation. How to ise it opposite?
@kanchankondhare4 жыл бұрын
Nice practical theory great teaching good work
@waterfuel10 ай бұрын
I have minus 130volts pulsing that needs to turn on P channel MOSFET with load on ground side ,through optocoupler 4N25. Can I use diode to reduce the negative volts down, and then use step down voltage divider LEVEL SHIFTING CIRCUIT to change polarity to positive low volts to input of optocoupler IC ? Can the input negative volts go to the diode cathode of opto?
@bimmerboard4 жыл бұрын
Wow, VERY nice tutorial. Thanks!
@amirabbasamrollahi99533 жыл бұрын
thanks for your time dedicated
@joseriggio43665 жыл бұрын
very informative episode, I wonder what is the maximum frequency tha optocoupler can be oprated, cause I was thinking to use it on a high voltage switching power supply control around 200 KHz
@youssefdirani5 жыл бұрын
Thanks I like the circuit in 2:16 and I guess I will be using it to protect it in general and not just for relays. What do you think?
@alejandroponce13445 жыл бұрын
Good presentation thank you
@jamest.50017 жыл бұрын
what type of transistor is most efficient? as far as power consumed or lost, is a MOSFET more efficient than like a Darlington. of BJT or IGBT? I'm asking because I'm looking for the best switch to use in pwm battery powered apps. for longer run time. thanks for great videos.
@WorBlux2 жыл бұрын
Do you have any more detail on the protection circuit or sources to check out? Theory of operation, how to pick values and components? I'm looking to build a circuit to accept a 30-300V variable HZ AC (two legs of a three phase alternator) input to a 5V square wave. I'm thinking build around a H11L1 and my best idea before that was to try a capactive coupling against the positive output of the rectifier.
@xavierliebenberg58135 жыл бұрын
Hi there, Lewis, great tutorials head's up!!!
@raym96919 жыл бұрын
Looking forward to see how to pwm an ac load! Most ssr's cant handle pwm with out over loading, and the ones that can are really expensive. Any suggestions for pwming a 120 volt light source. Thanks for the great videos.
@davellewellyn93064 жыл бұрын
Great video but I have a question, is it possible to invert the output of the opto iso;lator? example i need a circuit where the output transistor is switching a motor but the motor goes off when the opto is operated as opposed to the motor going on when the opto is isolated. I guess there is a way but i am not sure how to apply it.
@lovelydhaya6 жыл бұрын
5v to 24 v optocoupler circuit diagram. Using encoder output 5v to PLC 24 v converter
@govtitimaraduplacement27757 жыл бұрын
very good presentation thank you
@z1catfish8 жыл бұрын
guess I'm doing something wrong, trying to cycle a pair PNY17-1 with a 555, and I can not get any voltage through the couplers. tried a few different ones. Great video though.
@waterfuel9 ай бұрын
######!!Don't I need 2 bipolar transistors to shut off the P channel? (no mechanical switch to disconnect ground) I need optocoupler + 2nd transistor to shut off P channel as used as HIGH SIDE SWITCHING.???????
@LewisLoflin9 ай бұрын
No. The 10K resistor will charge the gate back to +Vcc. It will switch on with a difference in voltage on the gate source.
@rafaelmarroquin44298 жыл бұрын
great video, and thanks for the schematic :)
@aakashsharma81347 жыл бұрын
can i use this opto to take pwm and control the firing angle of the triac
@IuliusCurt4 жыл бұрын
Why do we need the additional transistor / mosfet? Why isn't the octocoupler enough to open/close the bulb to source circuit?
@LewisLoflin4 жыл бұрын
Opto-couplers are usually limited to 100mA.
@melisawhitt83607 жыл бұрын
you have a lot of great tutorials Lewis
@devonsam42973 жыл бұрын
You all prolly dont give a damn but does any of you know of a method to log back into an instagram account? I stupidly lost my account password. I would love any assistance you can give me.
@dustindemetrius67563 жыл бұрын
@Devon Sam Instablaster ;)
@devonsam42973 жыл бұрын
@Dustin Demetrius Thanks so much for your reply. I got to the site through google and im trying it out atm. Looks like it's gonna take quite some time so I will get back to you later with my results.
@devonsam42973 жыл бұрын
@Dustin Demetrius it did the trick and I finally got access to my account again. I am so happy! Thanks so much, you really help me out :D
@dustindemetrius67563 жыл бұрын
@Devon Sam happy to help :D
@andriejameslibre723 жыл бұрын
thanks for the info sir
@wolfgangboettcher31263 жыл бұрын
Ich teste das
@thamerali96973 жыл бұрын
You are great man
@rickmandrey67605 жыл бұрын
Great video! How did you size the 220ohm resistor on the input side of the 5vdc circuits?
@serginx2 жыл бұрын
Yes
@andrewferg87374 жыл бұрын
Very informative. Thanks for sharing!
@GordieGii Жыл бұрын
Isn't there a different current limiter for the input instead of a crowbar circuit without the 2W resistor?
@LewisLoflin Жыл бұрын
You can use any current limiter.
@moroniafrifa6147 жыл бұрын
Thanks a lot! Been looking for this.
@masouddayaghi59234 жыл бұрын
thanks dear Sir, you rescued me
@permapsy20208 жыл бұрын
Nice video. So Lewis, the only circuit here that will do PWM is the "Basic NPN transistor solid state DC relay"? I want to isolate a PIR sensor and an Arduino from a 9g relay because the relay seems to be affecting the sensor. Can I still run a wire from an IO pin on the Arduino to the servo so that I can control it?
@permapsy20208 жыл бұрын
For efficiency can I use a MOSFET instead, over on the right hand side of the diagram?
@aripratama3335 жыл бұрын
I have a problem with opto isolator in my circuit it is still respond to command but only give weak current output around 2ma. I connect the output to drive 12v relay. Why is like that?
@LewisLoflin5 жыл бұрын
Not sure what you mean. Be more specific.
@hamadsherazi68963 ай бұрын
what are the part numbers of Mosfet?
@LewisLoflin3 ай бұрын
See this webpage: www.bristolwatch.com/ele/h_bridge.htm
@AltayBrusan4 жыл бұрын
thank you sir
@cspearsall8 жыл бұрын
Can this be used in the opposite direction. That is to say, I would like to use a 24v proximity switch, through an optocoupler to signal a pin on the arduino @5v (or take the 5v signal to ground)
@LewisLoflin8 жыл бұрын
+Christopher Pearsall Should work.
@zm71606 жыл бұрын
Good stuff.
@user-js7ip7hf1u4 жыл бұрын
Thanks appreciated and subscribed
@taurus_03 Жыл бұрын
10:58 What is the use of 10k ohm resistor between the gate and anode 1 terminal of triac?
@LewisLoflin Жыл бұрын
Forms a voltage drop across MT1 and gate.
@taurus_03 Жыл бұрын
@@LewisLoflin Thanks, I have the same project in school that uses BT136 triac. (AC LIGHT DIMMER)
@ramadanazab81207 жыл бұрын
thank you very much
@noweare16 жыл бұрын
What is the function of the 1k resistor between the emitter of the 4n25 and the base of the TIP120 ?
@LewisLoflin6 жыл бұрын
Limits base current of TIP120.
@germas3694 жыл бұрын
so is the main purpose of the optocoupler to provide isolation ?
@LewisLoflin4 жыл бұрын
Yes. It is used also for interfacing.
@GurnBograt19868 жыл бұрын
Awesome!
@mrtracyut9 жыл бұрын
I highly recommend investing in a better mic for your voice over. :)
@tiagovla8 жыл бұрын
Is the output resistor connected to the 4N25 just to ensure that the maximum current will not exceed 150mA?
@LewisLoflin7 жыл бұрын
Should not exceed 20 mA. Are you referring to the one on the opto-coupler LED?
@tiagovla7 жыл бұрын
Yeah. I wanted to write 15mA (~16.4mA), sorry. In a practical project, can I consider the CTR specified on the datasheet? Or does it may have a large variation?
@hilalalhakani91398 жыл бұрын
good morning mr lewis whats the difference between a Pnp transistor like tip120 and the N channel mosfet ... and how can we assure that Vcc doesnt not exceeds vgs thx in advance
@LewisLoflin8 жыл бұрын
They are very different devices one current operated while MOSFETs are voltage operated. See this page on MOSFETs: www.bristolwatch.com/ele2/mosfet_relay.htm
@hilalalhakani91398 жыл бұрын
thx a lot for your help
@jukees36589 жыл бұрын
You get that proto-board from dealextreme? I bough some, but hadn't had time to test those out, are they any good?
@LewisLoflin9 жыл бұрын
I built it. I put together 2 strip boards available anywhere glued to a scrap fiber glass base.
@andreyace8768 Жыл бұрын
👍👍👍👍👍!
@sathiyanathanl65994 жыл бұрын
Can optocouplers be used for high power rating?? 3KVA????
@LewisLoflin4 жыл бұрын
No. They are low power devices. They can control higher power circuits with say IGBTs, etc.
@muratcakr56406 жыл бұрын
Hello Lewis, first of all, I would like to thank you for those awesome videos. I am new to electronics and whatever I've learned so far, thats thanks to you. But I was wondering one point. The max collector current is, lets say 100 or 50 mA of the optocoupler, in the schematic kzbin.info/www/bejne/amGbop-JZ99pr9Um44s, isn't a current limiting resistor required?
@GimmickEffects4 жыл бұрын
Could this be used to convert 24VAC to logic level signals?
@LewisLoflin4 жыл бұрын
No this is for DC. You would have to rectify/filter the AC (1.41 X VAC) and use a larger dropping resistor.
@GimmickEffects4 жыл бұрын
@@LewisLoflin Thank you for your prompt reply. In addition to solving my current project's needs, I'm very interested in learning how to understand and do this correctly. Do you know of any resources that I might look to to better understand how to properly design a circuit that will convert 24VAC to 3.3VDC?
@swedensy4 жыл бұрын
So why noone on the internet have never built dc dc buck 100v 100A?? Maximum I ever seen is buck 55v 22A
@LewisLoflin9 жыл бұрын
One can't use PWM with an AC circuit. You have to sync to the AC waveform then switch on an SCR or triac between half cycles. I'll have that coming up.
@JiriUL8 жыл бұрын
Thank you for your truly awesome and explanatory videos! Can I ask what if an IGBT is used instead of an SCR? Would this work in combination with an opto coupler controlled by Arduino/555 which would be sending the PWM signals?
@LewisLoflin8 жыл бұрын
No if it's DC and if AC has to phase synced.
@LewisLoflin7 жыл бұрын
Not sure I can answer I don't know the particular structure of the device. Just looked this up an a DC device opto-couplers will work as long as the voltage isn't too high on the opto-coupler.. www.ixys.com/documents/appnotes/ixys_igbt_basic_i.pdf
@12htech706 жыл бұрын
How to control speed of dc motor which is operate from 24v 10amp dc supply
@LewisLoflin5 жыл бұрын
@@12htech70 Make sure the drive transistor is about 15 amps.
@madhusagar17415 жыл бұрын
Sir instead of tip120 Can I use tip 127
@LewisLoflin5 жыл бұрын
Should work.
@madhusagar17415 жыл бұрын
@@LewisLoflin thanks sir it worked perfectly 👍
@Electromaniaworld6 жыл бұрын
what is better optocoupler or mosfet ?
@LewisLoflin6 жыл бұрын
Not the same thing. An optocoupler is low voltage low power. A MOSFET has high voltage and current rating in most cases.
@Electromaniaworld6 жыл бұрын
thanks. but we can have low power mosfets too ?
@LewisLoflin6 жыл бұрын
Yes they exist all the time within CMOS ICS, etc. The 2N7000, ZVN3306A, and the BS170 all n-channel low power MOSFETs.
@LewisLoflin4 жыл бұрын
New see: www.bristolwatch.com/ele3/ele6.htm Optocouplers for TTL-CMOS Logic Level Shifting
@ningarkumar3897 жыл бұрын
how to latch circuit pls with OCP
@LewisLoflin7 жыл бұрын
What are you asking?
@integraxnine7457 жыл бұрын
Are you asking for LASCR OCP ? If yes, then you can use it for latching circuit.
@nazmulhudanadim20309 жыл бұрын
Solar Charge controller
@wolfgangboettcher31263 жыл бұрын
Mal sehen was wir haben
@aqib20003 жыл бұрын
Silly, did not even mention CTR once!!!!!!!!!!
@chborger1853 жыл бұрын
oYEEAAA send my SEMIconductor SIMULATER_eagle Autoroute_ ?? what a GUESS?? isn`t it??
@wolfgangboettcher31263 жыл бұрын
Ich sage nur wellenvormen und ich weiß was ich da mache,es ist kein Optokoppler
@wolfgangboettcher31263 жыл бұрын
Tr1 und 2 tr3 naja
@wolfgangboettcher31263 жыл бұрын
Elektronik ist immer in wellenvormen so das ganze Leben
@wolfgangboettcher31263 жыл бұрын
Impulse
@LewisLoflin4 жыл бұрын
New related video OptoCoupler Interfacing H-Bridge Circuits kzbin.info/www/bejne/jpvVaJd8nZifj7s
@LewisLoflin2 жыл бұрын
Here is how to use photovoltaic optocouplers: High Voltage IGBT H-Bridge Using Photovoltaic Optocouplers kzbin.info/www/bejne/l6utoGeeYsqcbKs webpage: www.bristolwatch.com/ele4/index.htm Exploring Photovoltaic Optocouplers used as MOSFET Drivers kzbin.info/www/bejne/npy2iGuNhpl2mbs