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What type of transistor do I need to replace an NPN D227 G-615 It takes a 9V battery input at the emitter an IC's output at the base and the collector drives a 8ohm 0.2w speaker.?
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∙ 15y ago
Answer
The D227 is a general purpouse NPN transistor and not realy critical, one of the following, is ideal replacements for the D227 transitor
BC337, BC635 and BC637
There is an error in the question, a NPN transistor's Collector is always connected to the positive of the supply and not the Emitter, an easy way to remember it "the collector, collect the current (stream of electrons) and emit it at the emitter". It is correct if the speaker is connected between the positive of the battery and the collector, although it can be connected between the emitter and the negative but for many reasons it is not good practice.
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∙ 15y ago
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Can you replace a npn transistor by a pnp transistor?
Think of it this way: "P" is for Positive and "N" is for Negative So basically put a PNP Transistor Would use N to Switch P, in the name "PNP" or "NPN" the first character is for the polarity of the Collector-pin, the second for the Base-Pin, and the third for the Emmiter-pin. If you have a NPN Transistor you can`t just replace it with an PNP as the polarities differ. If you can find a way to change those polarities then sure it could work. I would say it`s best go out and buy a few of both so you have a few, otherwise if the application of the transistor is not in a high-current or high-voltage circuit try and find another circuit with the required type of transistor. Absolutely most transistors can be replaced with other similar transistors. Different transistors have different conditions they work by so you should do some research and replace it with another that is either the same or have approximately the same data. Example 1: A burned transistor with the data NPN, 45Volt, 100mA, 0,3Watt, need to be replaced. It is a discontinued transistor, so unfortunately no original spare part can be found. Check the max voltage of the circuit where it was. If the voltage is close to 35 volt, then you may want to replace it with a higher voltage transistor. If it is lower, say max 20 Volt, then you should be able to replace it with a lower voltage transistor. Check the type of circuit where it was. If in an audio amplifier, then you should choose a 'low noise' audio transistor. Look at the NPN transistors you can get hold of and make your choice based on similar or more current, similar or more wattage, similar or lower or even higher voltage. Most small signal transistors are interchangeable if you follow these steps. Even most power transistors are interchangeable but you should make an extra effort and check/match the HFE Data on the transistor too. Normally no need for an exact match at all.
How can you replace transistor with vacuum tube?
A: ABSOLUTELY but only in its function . To implement a change requires additional power requirements and design
Can you use an rcl 3000 lamp with a dead battery by plugging it into the wall?
No. The instruction manual for the RCL 3000 "Rechargable Remote Control Lantern" specifically states that the 120V House Current Adapter will not power the lantern and is only for charging the battery. You can replace the battery though... Brand = SkyTech Model = SC 46 Volts = 6 DC Ah = 4 (or 4.5) ApexBattery.com has them as of 1/30/2011 @ $7.95 each. Note: There are other tricks you can do to make the lantern work without a battery, but it requires knowing a little about electronics.
Which of these could not be used to replace a wire in a circuit?
student where given materials to comeplete a circuit to turn on one light.The materials recieved were two wires,a AA battery,and various size of the light bulbs.What is the variable in the experiment.
Can you make a voltage multiplier to run a 180 volts dc motor with a 12volts battery?
You can't make a DC voltage multiplier at all. You'd have to use the battery to power some sort of active power supply which, internally, would either oscillate or switch to create changing voltage, then step the voltage up through a transformer, then rectify and filter the higher-voltage AC, and hand you the higher DC at its output. You would use a significant and probably unacceptable percentage of the battery energy just to run the power supply. In other words, the battery would run the motor for an unreasonably short time before you would need to replace or recharge the battery. Look at the power requirement alone! If the 180V motor needs only 1 Amp to run, then the motor is gorging on 180 watts of power. To deliver only that much power at 12 volts, you would need to draw 15 Amperes from the battery, and that doesn't even yet account for power lost in the intermediate power supply.
Can UJT replace BJT?
No. A unijunction transistor (UJT) is entirely different in design and application than a bipolar junction transistor (BJT). The UJT works on the principle of voltage modulation of the effective substrate resistance, while the BJT works on the principle of current amplification from one junction to the other, usually base-emitter to collector-emitter.
Is the pnp transistor in common collector can be replaced with npn transistor?
No. The PNP and NPN transistors are exactly opposite each other in polarity. You cannot just replace one for the other without redesigning the circuit.
How is the NPN transistor different from the PNP transistor?
"P" is for Positive and "N" is for Negative So basically put a PNP Transistor Would use N to Switch P, in the name "PNP" or "NPN" the first character is for the polarity of the Collector-pin, the second for the Base-Pin, and the third for the Emmiter-pin. So if you have a PNP Transistor you can`t just replace it with an NPN as the polarities differ. If you can find a way to change those polarities then sure it could work. The Collector-pin basically receives the bigger current. The Base-pin determines how much of that current will be transferred to the emmiter-pin. So in a PNP the base current could for example be 0V and the Collector 5V, this will allow a free flow of current from Collector to Emmiter, the usage of a transistor in many cases is to switch high current with lower current. The main difference is that a PNP transistor uses "holes" as carriers and an NPN transistor uses electrons as carriers (It is to be remembered that the flow of current is always in the direction opposite to that of the flow of electrons). The difference in the symbol for the two transistors are that the PNP transistor will have an arrow pointed to the base from the emitter, and the NPN has it pointing outside.
What can replace for 2N3904 transistor?
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no
What can replace a battery?
If you need a battery then there is nothing that can replace it.
When to replace the car battery?
if the battery gets weak and useless, then you have to replace it...
How do you replace a battery in a 2008 GMC Sierra 1500?
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What can you replace for 2N3053 transistor?
NTE128 is a direct replacement according to NTE's website.
What is common emitter amplifier with degeneration?
In electronics, a common-emitter amplifier is one of three basic single-stage bipolar-junction-transistor (BJT) amplifier topologies, typically used as a voltage amplifier. In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both, hence its name. An analogous circuit called the common source is constructed using field-effect transistors Common-emitter amplifiers generally have a very high gain which can vary widely from one transistor to the next, as it is a strong function of both temperature and bias current, making the actual gain unpredictable. Stability is another problem associated with such high gain circuits, due to any unintentional positive feedback that may be present. Other problems associated with the circuit are the low input dynamic range imposed by the small-signal limit and the high distortion resulting if this is exceeded. One common way of alleviating these issues is with the use of negative feedback, particularly with emitter degeneration. Emitter degeneration typically refers to the addition of a small resistor (or any impedance) between the emitter of the transistor and ground. The effect of this is to reduce the overall transconductance Gm = gm of the circuit by a factor of gmRE + 1, making the voltage gain depend more on the ratio of the resistors than the transistor's characteristics: The distortion and stability characteristics of the circuit are thus improved, but at the expense of a reduction in gain. Common-emitter circuits are used to amplify weak voltage signals, such as the faint radio signals detected by an antenna. When used in radio frequency circuits, it is common to replace the load resistor with a tuned circuit. This is done to limit the bandwidth to a narrow band centered around the intended operating frequency. More importantly it also allows the circuit to operate at higher frequencies as the tuned circuit can be used to resonate any inter-electrode and stray capacitances, which normally limit the frequency response. Common emitters are also commonly used as low noise amplifiers. At low frequencies and using a simplified Hybrid-Pi model, the following small signal characteristics can be derived. If the emitter degeneration resistor is not present, RE = 0 Ω. According to these formulas and in agreement with the previous discussion, when RE is increased the input resistance is increased and the gain is reduced. {| ! ! Definition ! Expression ! Current gain ! Voltage gain ! Input resistance ! Output resistance |} The bandwidth of the common emitter amplifier tends to be low, due to high capacitance resulting from the Miller effect. The base-collector capacitance is effectively multiplied by the factor 1 − Av, thus increasing the total input capacitance and lowering the overall bandwidth. The discussion of bandwidth parallels that in the article on the common source amplifier. A fix for this bandwidth problem is the cascode amplifier. == ==
What computer component did the transistor replace?
the vacuum tube
