What are BJTs used for?

A bipolar junction transistor (BJT) can be used in many circuit configurations such as an amplifier, oscillator, filter, rectifier or just used as an on-off switch.

What is NPN and PNP?

It’s easy to remember that NPN stands for Negative-Positive-Negative and PNP stands for Positive-Negative-Positive transistors. Let’s take a closer look at how NPN and PNP transistors work. NPN transistor is powered on when enough current is supplied from the transistor base to the emitter.

What are the 2 types of transistors?

Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET).

How do PNP transistors work?

Working of PNP Transistor Emitter current is created when the emitter-base junction is forward biased, the emitter pushes the holes towards the base region. When electrons move into the N-type semiconductor or base, they combine with the holes. The base is lightly doped and is comparatively thin.

Are BJTs still used?

Yes, BJTs are still used. BJTs have higher transconductance, which gives them higher gain. They are ideal for amplifiers, where you want to maximize the gain. In opamps, for example, you are limited to two stages for stability reasons.

Where are MOSFETs used?

Power MOSFETs are commonly used in automotive electronics, particularly as switching devices in electronic control units, and as power converters in modern electric vehicles. The insulated-gate bipolar transistor (IGBT), a hybrid MOS-bipolar transistor, is also used for a wide variety of applications.

Which is better NPN or PNP?

The majority charge carriers in an NPN transistor are electrons and the majority carriers in a PNP transistor are holes. The electrons have better mobility than holes. Therefore, NPN transistors are preferred over PNP transistors.

How do you know if a transistor is NPN or PNP?

Connect the positive lead of the multimeter to the Base (B) of the transistor and connect the negative lead to the Emitter (E) of the transistor. If it is an NPN transistor then meter should show a voltage drop between 0.45V and 0.9V. If it is a PNP transistor, then it should display see “OL” (Over Limit).

Which type of transistor is most commonly used?

There are many types of transistors, but the most commonly used transistors are Field-Effect Transistors and Bipolar Junction Transistors.

What is the most common transistor used today?

The MOSFET is by far the most widely used transistor for both digital circuits as well as analog circuits, accounting for 99.9% of all transistors in the world. The bipolar junction transistor (BJT) was previously the most commonly used transistor during the 1950s to 1960s.

Can I use PNP instead of NPN?

Generally, the PNP transistor can replace NPN transistors in most electronic circuits, the only difference is the polarities of the voltages, and the directions of the current flow. PNP transistors can also be used as switching devices and an example of a PNP transistor switch is shown below.

Why are BJTs faster than MOSFETs?

BJT can switch faster than MOSFET due to the less capacitance at the control pin. However MOSFET is more tolerant to heat (stable to thermal changes) and can simulate a good resistor.” So, to answer your question, a “BJT can switch faster than MOSFET due to [there being] less capacitance at the control pin.”

Which is better FET or BJT?

It is a majority carrier device. FET is less noisy compare to BJT. It is more suitable for input stages of low level amplifiers….FET.

BJT	FET
Low current gain	High current gain
Low input impedance	Very high input impedance
Low output impedance	High output impedance
Medium Noise Generation	Low Noise generation

What is advantage of MOSFET?

The main advantage of MOSFET is that there is no gate current i.e. it does not have any input current. It has a very high input impedance due to the insulation layer. It consumes negligible energy in its operation due to a very low leakage current. It has a very high switching speed.

What is the difference between transistor and MOSFET?

The Bipolar Junction Transistor (BJT) is a current-driven device (in contrast, MOSFET is voltage-driven) that is widely used as an amplifier, oscillator, or switch, amongst other things. A BJT has three pins – the base, collector, and emitter – and two junctions: a p-junction and n-junction.

Which transistor is best?

Best Transistors: BJTs

• #1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits.
• #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT.
• #3 Power – TIP120.
• #4 N-Channel (Logic Level) – FQP30N06L.

Which transistor is most commonly used?

How do I know what type of transistor I have?

To help identify them, transistors are labeled with number and letters on their casings. Transistors are labeled according to the numbering system that is used. The primary numbering systems are JIS, Pro Electron, and JEDEC.

How can you tell if a transistor is good or bad?

Hook the positive lead from the multimeter to the to the COLLECTOR (C) of the transistor. Hook the negative meter lead to the BASE (B) of the transistor. For an good NPN transistor, you should see “OL” (Over Limit). If you are testing PNP transistor, the meter should show a voltage drop between 0.45V and 0.9V.

What is the best transistor?

Who invented the transistor radio?

The Regency TR-1 is patented by Richard C. Koch, US 2892931 , former Project Engineer of I.D.E.A. In February 1955, the second transistor radio, the 8-TP-1, was introduced by Raytheon. It was a larger portable transistor radio, including an expansive four-inch speaker and four additional transistors (the TR-1 used only four).

Are transistor radios collectable?

Generally, the most collectable and historic transistor radios are those made in Japan from 1956 to 1963 and America from 1955-60. One easy way to date a transistor radio to this period is to look for small triangles or circles between the 6 & 7 and the 12 & 16 on the dial.

How do you date a 1950s transistor radio?

1950s Transistor Radios: The Early Years. Generally, the most collectable and historic transistor radios are those made in Japan from 1956 to 1963 and America from 1955-60. One easy way to date a transistor radio to this period is to look for small triangles or circles between the 6 & 7 and the 12 & 16 on the dial.

What is the best book on transistor radio technology?

The Transistor Radio Handbook: Theory, Circuitry, and Equipment. Editors and Engineers, Ltd. page 32 ^ a b c d e f g h i j k David Lane & Robert Lane (1994). Transistor Radios: A Collector’s Encyclopedia and Price Guide. Wallace-Homestead Book Company. pp. 2–7. ISBN 0-87069-712-9. ^ Deffree, Suzanne (17 October 2017).