robotmaker
I design alot of circuils been electronic engineer and was look at are using using switching transistors to turn on lights ,relays and more
Transistors are mostly old school design ,before mosfets came out,if you look at the h-bridges now that use mostfets instead of transisors
For a few reasons one is low RDS on ,with meens they can handle higher wattage and not get hot using transistors ,plus less voltage
The most common is n-channel and have 3 pins ,GATE witch goes to digital output with a current drive resistor then SOURCE witch is the load and DRAIN is ground
Now for protection for mosfets most have a diode that protect it from EMF or inductive kickback
MOST i see use diode on transistors from collector to emitter ,NOT a good idea manly it does suppress or stop the inductive kickback and if using a microprocessor or circuits with will get resets and more induce in th system
so where the diode goes is always across the coil with cathode (black line ) to postive and NO inductive kickback
DIODES are only needed for inductive loads ,motors and relays or coils
Not for resistance loads ,lights or heaters ,leds will put up a simple circuit
second part will be how to control AC products,RELAYS are also not good slow switching and as noises on the contacts that does resets but wull give info on how to fix them
HOPE this is easy to understand if not just ask a question
YES i saw that it was my idea to use a mosfet ,when you made your it was first using TIP120 and now you took credit for my idea.
I'll pay you 90% royalties then... Idiot...
I've taken no credit from anyone. I have not claimed the TIP circuit is mine nor have I claimed using mosfets are my idea. I offer the information in a clear and easy format for anyone regardless of experience and knowledge to use.
This is a community which relies on clear information relayed by other community members. It is not a competition, a rivalry or a case of who has the best ideas, it is about providing the community with clear and easy to understand information, please try to understand that.
Not important to pay me and dont need it Just making a point THAT your tutorial is about TIP120/TIP122 TUTORIAL not about using a mosfet
my idea are not to compete with anyone its to HELP OTHERS ONLY
Just like your idea's are to help others too.
Re-edit it for a missed spelled word
Again, the tutorial I wrote now covers using a MOSFET. This "tutorial" is pretty redundant.
I've nothing more to say on this.
P.s. you are aware 90% of nothing is nothing right?
You should make a new one then tip120 and mosfet tutorial. I see you made to change of using a mosfet after you saw my tutorial. ,witch is not a problem
BACK to my design using a mosfet witch this POST IS ABOUT ,its not about using TIP120 THERE IS A LINK FOR THAT
tip120/tip122 tutorial MY idea i have uses a smaller mosfet package at less then $1 each ,handles higher wattage then TIP120 with T-220 CASE ,mine has 17 amps at 45 watts I-PAk size
Also RICH may be i should add info about the TIP120 in my post and make the circuit. IT not good idea since it will take away of what my post is mainly about ,
But here is a photo of a TO-220-3 TIP120 photo looks like to compare to the mosfet one,also doesnt give the size ,but i think it much wilder the TO-220-3 ,but the height is much lower as you can see.
EDIT 3-20-2013
TO-220-3 is .415 by .600 inches and I-PAK is .255 by .250 so its about half the size
IF you think i am wrong check the datasheets.
Fred, you are correct it should be offline. Give me your email and I will assist you in private.
Rich, chill. It's ok to have more than one avenue to information. He has a point that his is about switching in general. That doesn't mean you both can't include more than what your title is about.
Both, this is a simple circuit in which no one has claim to it being their idea. That is unless someone can produce a patent# he was awarded. There's no prize to be had....no title to be credited. With that being said, it's polite to mention where your idea came from or who was your inspiration but improper to insist on it.
Thank you both for digging up all the data and references. I'm sure people are more informed because of it. Free information...it's a good thing.