transistors

Finally got around to learning about transistors and this is by far the best transistor site I came around. Feel free to add all you know about how to use different types of transistorshttp://www.allaboutcircuits.com/vol_3/index.htmlsearch around the site

Topic by guyfrom7up 


Transistor? Answered

I am constructing the flyback driver found on the power labs website and cant get a 2N3055 transistor quite yet. I do, however, have a bag of transistors i pulled out of CRT monitors. I was wondering if one would be a good substitute for the 2N3055 for driving a new flyback, the number is C4916, the base-collector voltage is 1500 V and the Collector current is 7 Amp

Question by budhaztm   |  last reply


Transistor

I would like to know if someone could draw up a small circuit using  a TIP3055 as a switch for these led lights,Im running these off a small circuit for a pir sensor, that uses a relay, and i want to use a Transistor or a mosfet  because of size. I just cant do the math for the cir.here are the spec. for the led lights."Working input voltage :12vdc working power 36W . working current 5 amp I know that you have to feed the Base with a lower voltage, and the emitter goes to ground, and the collector get the 12vdc. tks for the help. I never was good at algebra in school, don't even remember it,  ha ha ha

Topic by conntaxman   |  last reply


transistor substitute?

Can i use bd 139 instead of bc 547

Question by jumper1111   |  last reply


DIY Transistor?

Do you think it'd be possible to make a completely homemade transistor? Not a homemade transistor amp or anything, just the transistor. I know, you could just buy one for cents, but you can also just buy a lot of stuff that you can have fun making. What about turning a normal transistor into a phototransistor? Just sand the coating off the silicon?

Question by LeviMan_2001   |  last reply


Choosing a Transistor ? Answered

Hello All.. I wan't to power up a 10A (12v)  loads with a Arduino .. What is best transistor for this job ? Also what is the resistor value to use between Arduino ? Thanks all..

Question by EZELab   |  last reply


What is a transistor? Answered

Hey guys, I am having problems understanding what is a transistor. When I do a search it shows me that its made of semi-conductor material and stuff, I don't want to know that. I want to know what is does as in a battery supplies power, resistor limits current etc. I would really like it if someone could give me a basic explanation of what is a transistor. Thanks in advance :). -Prickly Potato

Question by The Prickly Potato   |  last reply


Transistor Trouble

Hi there, I have been working on controlling a large toy car with a wireless receiver from a smaller toy car, the motors I need to control are rated for 9V but the receiver only outputs 3V, reversing polarity to reverse the motor. I made this schematic using transistors to handle the voltage, but when I built the circuit the transistors began to heat up and there was no output. I am not sure why this is happening, so any help would be greatly appreciated. Thanks, Daniel

Topic by daniel12354   |  last reply


TIP31cg transistor

HI all, im trying to make this project, a led box that flashes to music https://www.instructables.com/id/Music-LED-Light-Box/ i purchased a tip31 transistor, but when i got home i discovered it was a top31cg. is this going to be a problem? thanks all!

Topic by i-like-cheese 


what is this transistor?

I found this transistor in an old genius ps2 mouse (the connection not play station!) it looks like any normal one i've searched google and data sheets searching for it nothing came with any information (one of them said this is a DC motor!) written on it: 536 f   1A exactly. so is it npn or pnp is it power,audio,or general purpose

Question by top.boy   |  last reply


Transistor help

I got a 5M LED Light Strip. Its controller say it needs 12V 2A but each LED uses 20mA each and there are 300 in this strip which = 6A. I want to cut this strip into 4 segments and power each one using an arduino. 1 strip = 2.1A 2 strip = 1.26A 3 strip = 1.5A 4 strip = 1.14A =6A My question is do I need different transistors for each strip because of the difference in amperage or can I use the same one? If so, which one!? Thanks for your attentions. Bobbay

Topic by Tzla   |  last reply


Wire Transistor?

How can I make a wire transistor? It needs to work quite well and has to be stable. Please help either with a picture and description or a schematic. Thanks to you guys in advance.

Question by tzq33tdq   |  last reply


MOSFET Transistor? Answered

Hey Instructables. I am working on a project requiring some MOSFETs but they have to be smaller than the Radioshack IRF510's (http://www.radioshack.com/product/index.jsp?productId=2062618). I think I found some ones that are smaller (http://www.jameco.com/1/1/195-bs170-transistor-bs170-n-channel-mosfet-60v-92.html), but do they have the same functionality? What I mean is, will they work the same way? I believe they will, since they are both labeled as N-Channel MOSFET Transistors, but its always good to check. Thanks in advance!

Question by Adum24   |  last reply


Transistor vocoder?

Hello, last night i was experimenting with my breadboard, and i came up with an idea, transistors have a supply voltage, which the small voltage controls pitch and volume. but i thought what if i had voice coming in to the supply voltage part(after being super amplified) and the keyboard comes in the control voltage side, would the keyboard not control pitch of voice, while voice modulates? thanks for your help.

Question by ski4jesus   |  last reply


equivalent transistors? Answered

I need equivalent transistors for ac188 and ac187 and is bc548 equivalent to bc148 i couldent find equivalents on google

Question by robot1398   |  last reply


What is a transistor ?

What is a transistor (( can it transform voltage for example from 5v to 12v ?? )) Which component can transform low voltage to a little higher voltage ?? Thanks !!

Topic by yousouf   |  last reply


Transistors in series

If I were to put transistors in series (and hook up there bases together through proper biasing resistors) would it increase the voltage capacbility of the circuit? I need a way of switching on and off about 1000 volts really fast. for example, would 2 750 volt transistors in series be able to handle 1500 volts or not? just a HV pic from my old, dead NST

Topic by guyfrom7up   |  last reply


Transistor Substitute

Hey! I'm attempting again to make a wireless FM transmitter. The project plans call for a BC547C transistor, which is pretty common but I don't have any. Can I use a 3904 or a 2N222A instead? Thanks!

Topic by HavocRC   |  last reply



Substitute of Power Transistor

What is the substitute of 2N6292 power transistor? Please suggest a good substitute of 2N6292.It must be an NPN power transistor. Thank you.

Question by SiamB1   |  last reply


AC187 Transistor Alternative???

Hi I was wondering if anyone knew of any Silicon or Germanium alternatives to the AC187 Transistor. Also is the BC548 or BC547 Silicon Transistor an alternative to the AC187 Germanium transistor?  Thanks in advance

Topic by Ikram1ali   |  last reply


Transistor switching problem

I am having trouble using transistors to switch a some LEDs, I have 5 LEDs in parallel being switched by one transistor but each LED is indervidually switched by another transistor. I have given each LED its own resistor and the problem I am having is that when all LEDs are on each LED gets dimmer then if only one was on. I don't really understand why this is happening but I'm not 100% comfortable with transistors and I have probably done something stupid. I have attached a image of how I have wired it up with only two LEDs

Topic by camlv   |  last reply


Choosing a transistor (NPN)? Answered

Hey Guys, Recently I was ordering electrical components online and when I reached transistors I couldn't choose any. I was wondering that can I order any transistor or will it ave to be specific one? I need one for projects like wireless induction, laser tripwires etc. I would really appreciate it if you could help. Thanks in advance -Prickly Potato

Question by The Prickly Potato   |  last reply


Transistors in LED matrices?

I'm confused about the purpose served by using transistors in an LED matrix.  Why not simply use current limiting resistors and a shift register?  What purpose do the transistors serve?

Question by KentaGrace   |  last reply


Transistor H-bridges

Is it possible to make a transistor H-bridge with PNP transistors or can it only be done with NPN transistors.  As far as my knowledge( or lack thereof) of transistors goes, I think it would be possible, but it would require more than 4 transistors and it would be much more complex, however I could be entirely wrong.  Any input would be helpful, thanks.

Question by jpenn   |  last reply


Transistor relay with NO and NC?

Does anyone know how to make a solid state relay with a NO contact and a NC?Does anyone have a schematic?Thanks.

Topic by thermoelectric   |  last reply


2x bipolar transistor? Answered

If I took 2 similar NPN transistors and connected both the bases together, both the collecters, and both the emitters, then put it into a circuit, what would the 2 transistors do? Would the maximum power dissipation be increased or something? 

Question by .Unknown.   |  last reply


Passive amplifier with a transistor? Answered

It's possible to build a passive amplifier with a transistor? i have think about something that might work with a capacitor conecting the audio + to the transistor base. not sure if will do, and if it do i don,t know how much resistence is needed on the other end of the circuit. also i'm going to use 2 15 ohm speakers in series.

Question by matokage   |  last reply


Resistors for a NPN transistor? Answered

In the circuit diagram(which I've uploaded),I intent to use a NPN transistor(BC 547) as a relay.The 9 VDC is stepped down to 5 VDC by a LM7805 and should be the trigger to the transistor,completing a circuit which needs the 9 VDC.The Collector is given the common negative of both the voltages and the trigger gets the positive 5VDC.I need a bit help to calculate R1 and R2.I had used two random resistors previously but the Load got powered by the 9 VDC even before the trigger was applied to the transistor.I figured out that the problem might be related to the resistors used. (I haven't included the caps used at the terminals of the regulator in the schematic)

Question by Adarsh_tronix   |  last reply


Transistor Related Questions?

Hey Guys, I need some help, I need to choose a transistor and get to know how to wire it. I have the following transistors: 6822 (http://pdf1.alldatasheet.com/datasheet-pdf/view/604250/ALPHAWIRE/6822.html) 2N3904 (https://www.sparkfun.com/datasheets/Components/2N3904.pdf) 19001 2N2222A (http://www.onsemi.com/pub_link/Collateral/2N2222A-D.PDF) TIP42C (https://www.fairchildsemi.com/datasheets/TI/TIP42.pdf) And I need help to choose one that can run an Green LED Strip (16 in.). And also how to wire it. If you can give me the steps to wire it up to the output of a circuit and how to wire it up with the led strip it will be greatly appreciated. Oh and also the voltage at which the transistor turns on should be 2.8-9v ish. Thanks in advance. -Prickly Potato

Question by SA-DIY   |  last reply



audio amplifier transistor? Answered

I pulled what looked like a voltage regulator from a PSU, i guess as it turns out its not? apparently its a audio aplifier transistor, but what would that be doing in a PSU? if its any use, it was near a fan connector on a small sub-board... markings are: UTC 2SD880 (2 small, undistinguishable letters)RKOB (or 0B) i believe this is the datasheet, correct me if im wrong. http://search.alkon.net/cgi-bin/pdf.pl?pdfname=utc/2SD880_TO220.pdf

Question by zack247   |  last reply


help picking transistor

Me no get no transistors. me need help. me using ltc4060 chip and me need help picking the pnp transistor. heres datasheethttp://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1037,C1078,C1088,P7601,D5235it's on page 14 - 15I'm using 3 cells and a charge current of 35 mABTW I'm not stupid, just never really got how to use transistors

Topic by guyfrom7up   |  last reply


Transistor Voltage Inverter

I am a newbie and was hoping someone could assist me. Given the following schematic which takes a voltage of 12v and considers it off and a voltage of 2 volts and considers it on can someone tell me what changes would need to take place regarding capacitors and resistors (if any) to account for 20v instead of 12v? Meaning that when 20v is considered off and 2v is considered on.

Topic by TimothyE2   |  last reply


How to select transistor?

Hi guys! How do you know which version of transistor to select when it comes to doing some projects? I mean, lets say i have all the parameters of my project, the output current and voltage, so how do you know which specific model of transistor to select from the data you have? Is there some kind of list from which we can select the required model from our data? For example, i have an LED array which draws about 90mA of current in total and has a total operating voltage of 15V, and from past instructables that i read on this site, i know that BC547 has a current rating of 100mA and can tolerate the voltages, so i can use it. My question is, that suppose i didn't read these instructables, then how will i know which transistor or FET i have to select that has a current rating of about 100mA and can tolerate the voltages(i.e how will i know that i can select the BC547 or alternative)? Also, when selecting a diode for example, i know from reading few instructables that 1n4007 has a rating of about 1A and can tolerate good amount of voltages. Suppose i don't know about the diode, then how will i know that based on my requirements, i can select the 1n4007 diode? This is an example in general, and it applies to all cases of load currents and voltages, and other semiconductor devices.

Topic by charmquark   |  last reply


Transistor Swithching Voltage? Answered

Looking at this data sheet: http://www.datasheetcatalog.org/datasheet/stmicroelectronics/4136.pdf How much voltage has to be applied across the base and emitter to switch on a "TIP 3055" transistor? The V-be row is the only thing that looks like it is telling about that, but I don't think that's what I'm looking for (mabey it is?).

Question by Jaycub   |  last reply


Transistor voice modulation?

Alright, i know now that there is a way to modulate your voice from putting signal in on the voltage pin of a transistor, and controlling it with a synth into the input voltage. But now, what is that effect? and what is a way to smooth out or get clean sounds from it? Any help is appreciated. Thank you. 

Question by ski4jesus   |  last reply


help w/ transistors

Does anyone know a good experiment to teach what transistors do? I have read everything I can find about them and I still don’t understand what they do and how they do it. Can anyone help?

Topic by kendallickes   |  last reply


Transistor Voltage Inverter?

I am a newbie and was hoping someone could assist me. Given the following schematic which takes a voltage of 12v and considers it off and a voltage of 2 volts and considers it on can someone tell me what changes would need to take place regarding capacitors and resistors (if any) to account for 20v instead of 12v? Meaning that when 20v is considered off and 2v is considered on.

Question by TimothyE2   |  last reply





Transistor as switch with low leakage current

I don't really know much about transistors, alas, but I am looking to use a transistor as a switch in a device where it's important to me to that the batteries (3xAAA) last about a year. This means that I want to minimize leakage current. I would like to use about 20 mA at 2.7V to control 0.5-1 A at 3.3V (I have 4.5V at my disposal, so I can handle a 1.2V drop through the transistor). The device is a water leak alarm which I assume uses almost no current except when it's alarming. Any suggestions on what to use?  A lot of people use TIP120s as switches, but I've also seen comments that indicate that they have an unpleasantly large leakage current. And I don't need the high voltage/current/amplification capabilities of the TIP120. Or should I just use a solid state or electromechanical relay?

Topic by arpruss   |  last reply


what are the requirements for using a bd 140 transistor?do i need to use another transistor to drive it?

My friend said i need to use another transistor like bc 547 at bd 140 base why?

Question by 02.anand.m   |  last reply


How a Transistor connected to 12v and out 4.7v !!!!!!? Answered

Hello All, I have a problem with a circuit i am building, I use a 2N2222 transistor to drive a Common Cathode big 7 Segment  with a 595 shift register.. I connected a 12v to Emitter, the collector out a 4.7 volts !! How is this possible ? could some one explain please ? Thanks all

Question by EZELab   |  last reply


information required about "NEC D882 PNP-transistor"?

I need help and instructinos about "NEC D882 PNP-transistor" i want to use it in lamp ballast.. tell me the other equivelent transistor.... the maximum volt and current we can give to these transistors.... thanks

Question by bilalinpk   |  last reply


how to use multiple transistor to switch single device so that each transistor has less load and desnt get hot?

I want drive a motor 12v havn't measured current but their product is enough to burn transistor can't i add more than one switch(transistor) so that current through each transistor is less or voltage or something like that that doesnt burn any thing. 

Question by Atul009   |  last reply


How do i know if a transistor is of PNP or NPN type?

I want to know how to recognize the type of transistor.

Question by bishal   |  last reply


How do I know if a transistor is a 2N4401 or a 2N3904, etc? Answered

Good day. I'm a newbie scavenger, and I scavenge parts since I don't have enough money to buy new parts. I want to know if the transistor i found is a 2N4401 or a 2N3904 or another? I can't find it in the Internet. One thing I know is that it's an NPN transistor. I also noticed some numbers on the flat side of the transistor. Does it help in determining the transistor? Thanks in advance to those who will answer. :D

Question by CarlGemarino   |  last reply