Can two diodes be used as a transistor?

Can two diodes be used as a transistor?

No, two diodes connected back to back cannot be used as a transistor. A PN diode will have equal doping on both sides, but for a transistor, the base must have the least doping level and the emitter must be highly doped. Joining two diodes will make the base size larger than the emitter and the collector.

Can a transistor work as a diode?

Since a bipolar transistor is essentially two diodes, it can function as such. However, since bipolar transistors are not designed to be used as diodes, using them as diodes might cause a problem in terms of current and other ratings.

What type of transistor that is made up of two diodes with shared anode?

BJTs can be thought of as two diodes (P–N junctions) sharing a common region that minority carriers can move through. A PNP BJT will function like two diodes that share an N-type cathode region, and the NPN like two diodes sharing a P-type anode region.

How can we make a transistor from a diode?

How to make transistor out of two diodes?

  1. Open the 2 diodes to get to the die.
  2. Extract the dies.
  3. Set the 4 contacts aside.
  4. Melt the dies into silicon.
  5. Extract the dopants and set aside.
  6. Purify the silicon.
  7. Let the silicon solidify.
  8. Injects the dopants to form 3 regions: N, P, and N.

How many diodes are there in a transistor?


A bipolar transistor essentially consists of two junction diodes on semiconductor material having positive (p) and negative (n) polarities.

What happens when two diodes are in parallel?

When the diodes are connected in parallel the current carrying capacity of the diodes increases. If the load current is greater than the diode current rating of one diode, then more than one diode can be connected in parallel to increase the forward current rating.

Can we use BJT as a diode?

Yes, you can built a simple full-wave rectifier using a PNP (emitter, base, collector), where emitter-base PN-junction as one diode and collector-base PN-junction as another diode. Both the emitter and collector are connected to a sinusoidal signal source.

Why are transistors used as diodes?

It is a common practice in precision analog electronics to use Bipolar transistors as diodes. The purpose is to obtain a very low leakage diode. For example, a 3904 type transistor will have <1pA of reverse leakage using the Base Emitter junction. However, it turns into a zener diode at around 6.8V.

Why BJT is called bipolar transistor?

Bipolar transistors are a type of transistor composed of pn junctions, which are also called bipolar junction transistors (BJTs). Whereas a field-effect transistor is a unipolar device, a bipolar transistor is so named because its operation involves two kinds of charge carriers, holes and electrons.

Where are PNP transistors used?

PNP transistors are used to source current, i.e. current flows out of the collector. PNP transistors are used as switches. These are used in the amplifying circuits. PNP transistors are used when we need to turnoff something by push a button.

Is it possible to make your own transistor?

Interestingly enough, no other well-documented DIY transistors have since been published. Jeri Ellsworth and Neil Steiner have both created transistors from prefabricated germanium diodes and cadmium sulfide photocells, respectively.

How can I make my own transistor?

The first step of making a thread-based transistor is to coat a linen thread with nanotubes. The coating creates a semiconductor surface through which electrons can travel. Attached to the thread are two thin gold wires – a “source” of electrons and a “drain” where the electrons flow in and out.

What is the difference between diode and transistor?

One of the major difference between the diode and the transistor is that the diode converts the alternating current into direct current while the transistor transfers the input signals from the low resistance circuit to high resistance circuit. The other differences between them are explained below in the tabulated form.

What is a basic diode?

DIODE – BASICS Definition. A diode is a two-terminal electronic component that conducts electric current in only one direction. Basics. A diode is an electronic component with two electrodes which a signal can flow between (but thermionic diodes can have one or two more electrodes).

What are the uses of diode?

A diode can be used for various purposes including the production of different signals such as an analog signal, frequencies such as microwave frequencies, or light. Those that produce light are known as Light Emitting Diodes or LED. This type of diode will produce light when current flows through it.

What is an electrical diode used for?

A diode is a semiconductor device used for passing electrical energy in a single direction. It means that when connected in an electrical circuit, the diode will allow the current to flow in one specific direction only and not in the reverse direction.

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