The 2N is a power bipolar transistor designed to handle high power loads in the range of V, and 15 amps. In this post we comprehensively discuss the pinout function, electrical specification, and application designs for the power transistor 2N If you are an electronic hobbyist, you might have certainly used this very useful, and efficient power transistor at least once in your experiments.
I have used 2N transistor many number of times in many of my high current circuit applications without any issues. Just like any other npn BJT, 2N connections are also pretty straightforward. In the common emitter mode which is most frequently used configuration, the emitter pin is connected with the ground line or the negative supply line. The base is connected across the input signal through which the transistor needs to be switched ON or OFF.
This input switching signal can be anywhere between 1V and 12V ideally. A calculated resistor must be included in series with the base pinout of the transistor. The base resistor value will depend on the load specifications attached at the collector pin of the transistor.
The basic formula can be studied from this article. The collector pin should be connected with one terminal of the load, while the other terminal connects with the positive supply line.
The load current specs must be at any cost lower than 15 amps, in fact lower than 14 amps to avoid current reaching the breakdown limit. Maximum ratings are the highest tolerable values beyond which a permanent damage can occur to the device. These ratings specified to the device are stress limit values not the standard operating criteria for the particular device and are not valid simultaneously.
2N3055 Power Amplifier
If these limits are exceeded, device may cease to function with its standard specifications, causing severe damage to the device and also affecting its reliability parameters. Meaning the transistor must not be operated to increased dissipation levels than what is advised in the curves traces. The 2N is a versatile NPN power transistor which can be effectively applied for all medium power current delivering circuit.
The few main of these applications are in the field of inverters and power amplifiers. Due to relatively high hFE range this device can be used in a wide range of circuits for handling high current efficiently. It's metal TO3 case becomes ideally suited for attaching a fast cooling large heatsink quickly and easily allowing the device to work in its most favorable conditions. I have plenty of 2N based circuits in this website, glad to present a few of them here.
The circuit is the most basic form of power amplifier which can be build using a single 2N BJT. Although the amplifier above looks too simple to make, the low-tech design forces the 2N to dissipate a lot power through heat.
For a more efficient and Hi-Fi amplifier design, I recommend the following mini crescendo, which is perhaps one of the most classic and efficient amplifier circuits using just a pair of 2N transistors.
For complete details you can read this article. I am sure you might have already come across this little inverter circuit. This circuit using only two 2N and a transformer for creating a reasonably powered 60 to watt 50 Hz power inverter. An ideal project for all new hobbyists and school students.
If you are not satisfied with the power output from the above design, you can always upgrade it to a full-fledged, to watt power inverter, using a single or many 2N transistors in parallel, as shown below:.
An awesome easy to build variable voltage and current work bench power supply can be built quickly using a single 2N transistor and a few other complementing components, as shown below:. For more description and parts list you can visit this post.
This simple automatic 2N based battery charger circuit can be used for charging any lead acid battery from 12V to 48V. The high current handling capacity upto 7 amps of this device will allow an ideal, charging for any battery from 7 Ah to Ah using the above circuit.
From the above posting we learned the main specifications and datasheet of the versatile workhorse transistor 2N This transistor is a universal power BJT that can be used in almost all higher power based applications where high current and efficient switching of current is expected. The maximum voltage this device can handle is 70V which looks very impressive, and a continuous current for around 15 amp, when the device is mounted over a well ventilated heatsink.
We also studied a few cool application circuits using 2N, and how to connect it through its pinout diagram. If you have any circuit related query, you may interact through comments, I'll be most happy to help!The mini crescendo watt transistorized amplifier circuit explained here was built and tested by me and am extremely pleased by its performance and also its ruggedness as far as maintenance and handling is concerned.
Basically, the entire configuration is a symmetrical class A amplifier incorporating an input filter stage, an intermediate driver stage and a powerful symmetrical output stage consisting of the versatile 2N power transistors. The circuit efficiently drives a watt 4 Ohms speaker with inputs derived from any audio source like a cell phone or DVD player etc. A quick glance at the given circuit diagram makes us conclude that the output configuration is not symmetrical, since the transistors T15 and T16 are both NPN types.
The input stage of the circuit begins or initiates with a symmetrical differential preamplifier stage consisting of the transistors T1, T2 and T3, T4.
T5 and T6 are positioned as the current sources which are further extended as the driver stage consisting of the transistors T7 and T8. However a closer inspection tells us that of course the wiring is symmetrical, having the transistors T11, T13, T15 at the upper section acting like special booster transistor package. Similarly the lower section also employs identical super booster stage consisting of the transistors T12, T14 and T The above two sections are perfectly complementary to each other, with reference to the diagram which indicates their emitters being terminated to a common point through the resistors R25 to R27 and via R28 to R30, this effectively that the wiring is exclusively symmetrical by nature.
The output stage is able to produce a massivetimes amplification factor with comparatively very low quiescent current drain.
The quiescent can be set by the adjusting the preset P1. Due to a non critical nature of the circuit, the entire project can be easily built over a general purpose PCB, however the layout of the components or rather the placement and the ratio of the distance of the components must be kept as identical as possible to the layout of the circuit diagram.
Though a common heatsink may be used for the entire set of the output devices, I personally used separate individual heatsinks for each of the transistors. This saved me from the headache of using the cumbersome and low efficient mica isolation kit between the transistors.
The inductor is kept for improving the dynamic nature of the circuit. It is built by winding 20 turns of super enameled copper wire over the 1 Ohms resistor itself. The wire is selected to be close to 1mm in thickness. Though not absolutely necessary, for better thermal stability the transistors T9 and T11 and also T10 and T12 should be glued together, preferably by attaching the respective pairs face to face.
The quiescent current should be ideally set to 50 mA through the following initial procedure:. Mini Crescendo pdf with PCB and protection circuits. If you have any circuit related query, you may interact through comments, I'll be most happy to help!
Your email:. Hello Swagatam. I noticed that to improve the performance you have made some modifications to the original ckt at the input RC network, replacement of zener diodes with LEDs in the constant current circuitry and feedback components. I would like to know to what extent the improvement in terms of frequency response, harmonics distortion, output power, input sensitivity mV for rated output improved, if any.
This will help me to decide which ckt I should go for i. I also noted that the modified ckt uses the same power supply as that of the original ckt. Further, I am sure that you might be having performance parameters as mentioned in the original ckt article published in elector magazine.
Still for my satisfaction I am mentioning some of these as below: i Output power 40 Watt into 8 ohm, 60 watt into 4 ohm for a distortion not greater than 0.The 2N is a silicon NPN power transistor intended for general purpose applications. It was introduced in the early s by RCA using a hometaxial power transistor process, transitioned to an epitaxial base in the mids.
The exact performance characteristics depend on the manufacturer and date; before the move to the epitaxial base version in the mids the f T could be as low as 0. It often has a transition frequency of around 3. The frequency at which gain begins to drop off may be much lower, see below. The maximum collector-to-emitter voltage for the 2N, like other transistors, depends on the resistance path the external circuit provides between the base and emitter of the transistor; with ohms a 70 volt breakdown rating, V CERand the Collector-Emitter Sustaining voltage, V CEO susis given by ON Semiconductor.
Sometimes the V CBO breakdown voltage the maximum voltage between collector and base, with the emitter open, an unrealistic arrangement in practical circuits is given as the only voltage rating, which can cause confusion.
The total power dissipation written P D in most American datasheets, P tot in European ones depends on the heatsink to which the 2N is connected. The device is designed to operate with an efficient heatsink, but care must be taken to mount the device properly,    else physical damage or worsened power handling may result, especially with cases or heatsinks that are not perfectly flat.
Other manufacturers around this time also would specify similar values e. RCA by had changed their specification to give 2. Modern 2N datasheets often, but not always, specify f T of 2.
Nevertheless, a 2N and many other power transistors originating from this era cannot be assumed to have great high-frequency performance and there can be degradation of phase-shift and open-loop gain even within the audio frequency range.
Modern successors to the 2N can be much more suitable in fast-switching circuits or high-end audio power amplifiers. The historically-significant 2N was designed by Herb Meisel's engineering group with RCA; it was the first multi-amp silicon power transistor to sell for less than one dollar, and became an industry workhorse standard. The team of design, production, and applications engineers received RCA Electronic Components achievement awards in The 2N remains very popular as a series pass transistor in linear power supplies and is still used in for medium- current and high- power circuits generally, including low frequency power converters although its use in audio power amplifiers and DC-to-AC inverters is now less common and its use in higher frequency switch-mode applications never was very practical.
It was second sourced by other manufacturers; Texas Instruments listed a single-diffused mesa version of the device in an August datasheet. With changes to semiconductor manufacturing technology, the original process became economically uncompetitive in the mids, and a similar device was created using epitaxial base technology.
Also the higher frequency response has improved performance when used in audio amplifiers. Although the original 2N went into decline relative to epitaxial-base transistors because of high manufacturing costs, the epitaxial-base version continued to be used in both linear amplifiers and switching supplies.
Since the early s, the 2N transistor has been heavily targeted by counterfeiters, who substitute much smaller silicon dies with lesser power ratings, use inferior mounting techniques, and fake the markings. It is by now unlikely to actually obtain a genuine 2N transistor when using popular sales platforms such as Amazon or Ebay; classic electronics distributors are mostly still able to properly source them. Variants with higher voltage ratings e. An MJ PNPwhich is also manufactured using the epitaxial process today, is a complementary transistor to the 2N In the sixties and early seventies, Philips produced similar devices encapsulated in TO-3 packages under the reference BDY20 described as being for "hifi" purposes and BDY38 although the BDY38 has lower voltage ratings than the 2N The 2N is a much lower power version of the 2N, rated at 25 W55 V and 4 Abut became almost obsolete about the late s when many TO devices were withdrawn from mainstream manufacturers's lists.
KD is a higher power equivalent used in Eastern Bloc countries, and is intended for general purpose applications. It was produced exclusively by the Czechoslovakian electronics company Tesla. KD are packaged in a TO-3 case style called T41 by Teslait is a 20 amp80 voltwatt power transistor. It has a transition frequency of 2. The KD have higher power and higher current than 2N From Wikipedia, the free encyclopedia.
Horowitz; W. Hill The art of electronics 2nd ed. Cambridge University Press. The robot builder's bonanza 2nd ed.Here we learn how to make a very simple watt amplifier circuit using a 2N transistors and a few other passive components. As exhibited in the above diagram you won't find no costly or obsolete hard to find components in this amplifier circuit, except the power supply transformer and possibly the 4 ohm loud speaker. The input stage is created by configuring a couple of current drivers transistor stages responsible for triggering the pairs of power BJTs positioned at the output stage.
The 2N power stage at the output should be mounted on large heat sinks to ensure that this crucial stage is able to dissipate adequately and function with optimal efficiency. The a power supply of 80V, it becomes necessary to put a series capacitor in between the output stage and the speaker in order to block the DC supply from entering the speaker and allowing only the amplified watt music power.
The following diagram shows the pinout details of the various transistors used in this simple watt amplifier circuit using 2N transistors. I am sorry, I thought you were referring to the bridge diodes…the 1N diodes will not require any heatsink.
Hi is this really work? To have W RMS? The Arrangement seem to have a gain of just 4 dB. Use good quality caps. Your email address will not be published.
Notify me via e-mail if anyone answers my comment. Comments In the above 2N watt simple power amplifier; should the 1N diodes be mounted on the heatsink with the power transistors?
Can it still deliver watts by using a 8ohm instrumental speaker. I did not think about it at first so just went with NPN and got no output. Are you getting output with PNP? According to me the original diagram is correct.
Simple 100 Watt Amplifier Circuit using 2N3055 Transistors
Leave a Reply Cancel reply Your email address will not be published.Simple and low cost. The optimal supply voltage is around 50V, but this amp work from 30 to 60V.
The maximal input voltage is around 0. As you can see, in this design the components have a big tolerance, so you can build it almost of the components, which you find at home. The and transistors can be any NPN type power transistor, but do not use Darlington types… The output power is around 60W.
I use them in self powered loudspeakers and as poweramplifier for small and middel events. They are very trustfull andpowerfull. You realy can use almost any combination of parts in resistors, capasitors and transistors. A good heatsink does not mean a big one, but i advice to use an old fashioned one because you can it heat up firmly.
If you want to try this please try to make your first one on a pice plastic and mount it point to point like the drawing. I wish you all a lot of pleasure with this old fashioned ampli witha very modern sound. Still one advice: please use well tested or new parts and not you may decite often used parts.
Ferdi 2 years ago. Leave a Reply Cancel reply.The device is designed for general purpose switching and amplifier applications. The pin configuration of 2N is given below. The device has good amplifying factor and also the gain is almost linear making 2N one of best solution for power amplifiers. As mentioned earlier the 2N can be used for any NPN transistor applications but for understanding the functioning of device let us consider a simple application circuit as shown below.
Here we are going to use 2N as a simple switching device to drive a motor and is in common emitter configuration. As show in circuit we are using a motor as the load and the gate signal for turning ON the transistor is provided by 5V source with button being the triggering device. The trigger source and power source must share a common ground for the circuit to work. Under initial conditions the button will be open and no current flows through the base of transistor.
With no base current the transistor acts as open circuit and the entire supply voltage V1 will appears across it. When the button is pressed at certain time, the voltage V2 forms a closed loop with base-emitter of transistor as can be seen in circuit diagram. With this closed loop a current flows through base of transistor and with base current flow the transistor gets turned ON.
Having transistor acting as short circuit in ON state there will be collector current which flows through motor making it rotate. This motor will keep rotating until there will be base current. After a certain time when the button is released the base current becomes zero and the transistor gets turned OFF.
With transistor going to high resistance state in OFF mode, the collector current also becomes zero bringing motor to stop. The way of controlling power motor via simple push button realizes the use 2N as a switching device and in the same way we can use 2N in other transistor circuits. Subscribe to stay updated with industry's latest Electronics components and news.
Littelfuse's Nano2 F series enhances protection from overload and short circuit current events. Stewart Connector's SS series jacks are ideal in 2. How to use 2N Transistor As mentioned earlier the 2N can be used for any NPN transistor applications but for understanding the functioning of device let us consider a simple application circuit as shown below.
Component Datasheet.The following section contains a little more information on this point, as well as a beginner's example for each race. Build orders are quite simply your pre-determined production plans for the earliest stages of the game - what you're going to build and when you're going to build it.
This ensures you have a goal to work towards, and helps you work efficiently towards achieving it. There are more build order options out there than we could possibly summarise in any one guide such as this, but we wanted to highlight a solid starting list for each race that you can use to get going with.
In each video you'll find a versatile build order that should serve you well in all of your early match-ups. This is one area where you can take a little time to play against the AI, getting the flow of your hotkey and control groups together (see further on in this guide), while starting the process of building a super-efficient and robust economy. Again, just don't get addicted to stomping easy AI opponents in this way, and get back into real multiplayer at your earliest opportunity.
If you commit your chosen build to memory, you will find yourself at a huge advantage in the early stages of the ladder climb.
Having a solid plan in place will also free you up to focus on honing your other skills in the early days. If you do not make use of hotkeys, you are always going to be at a permanent disadvantage to anyone who does - even if (all things being equal) they're an inferior player to you.
It takes time to move between multiple UI elements, after all, moving your mouse and then clicking. How much better it would be if you could simply tap a button and head straight to your unit or structure of choice. Fortunately, StarCraft 2 provides an extremely flexible system for assigning hotkeys on the fly, and you are strongly encouraged to do so right from the very beginning of your time with the game.
That way you minimise any bad habits you might pick up, and reduce the amount of time between the decisions you make and the actions you take. If you examine the StarCraft 2 interface then you'll notice that every unit and structure has a hotkey assigned to it. You should commit every one of these to memory, and then get into the habit of using them - no mouse. This will help you spend your resources efficiently, without wasting any time either looking down at the keyboard or introducing unnecessary and time-consuming mouse movements to the production process.
Although not as precise or useful, you can also assign location-based hotkeys using the F5-8 keys. Just hold down Control when you're at a location you want to remember and hit one of the available F keys. This way you'll be able to tap on the key whenever you're somewhere else, and come whizzing back into view.
Control Groups are another vital element of playing StarCraft 2 competitively. Entire guides could be written on the subject, but for the purposes of our beginner's guide we're going to give you a basic overview.
We'll expand on this section if the guide proves popular. Put simply, Control Groups allow you to assign units and structures - individually or as groups - to the 0-9 keys, which in turn allows you to very quickly jump to whatever area of the game you need to oversee immediately. You might want to keep tabs on a scout you've sent patrolling for example, jump quickly back to your base to check on your resource situation, or just keep the factory lines rolling with new production orders.
To assign a unit to a Control Group, simply select it, then hold down Ctrl and 0-9.
Hi-Fi 100 Watt Amplifier Circuit Using 2N3055 Transistors – Mini Crescendo
To add additional units to that same group, select them and then hold down Shift and the number in question.
It's a bit fiddly at first, but you' will'll get used to it quite quickly. This will add all of the units of that type that are currently visible on-screen to the selection. You can also hold down Ctrl and click one of the target units to achieve the same result.
2N3055 Datasheet, Pinout, Application Circuits
Remember that a double-tap will zip the screen right over to the item you've assigned. This will allow you to quickly zip over and find out what they've uncovered about the enemy's plans. This lets you get back to base quickly to check on the state of production and resource gathering.
This will allow you to keep production rolling rapidly, without you having to revisit the base. Simply select the group then choose your production option using the hotkey options.