0
Why dont we get the transister action by connecting two diodes back to back?
Wiki User
∙ 12y ago
Because two diodes is not a transistor. There is an interaction between the junctions in the transistor, because of their proximity, that you don't get in the two diodes. The only use of modeling a transistor as two diodes back to back is to test a transistor with a multimeter as a quick go-nogo test for basic operability.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Can two diodes connected back-to-back produce a transistor?
No, two diodes cannot function as a transistor.The emitter and collector of a transistor have different and very specific doping profiles to optimize them for their functions, diodes don't.The base is a very very thin layer that both allows current carriers injected by the emitter to pass thru the base and be collected by the collector, and allows the transistor to operate at high frequencies (early junction transistors, a type called grown junction, had thick bases and could not function above audio frequencies), the diodes are physically separated with a long metal wire connecting them.
Can back to back semiconductor diodes can be added as npn or pnp transistors?
no, the shared base of a transistor between the emitter & collector must be thin to get the transistor effect. the thinner the better for high frequency transistors. this cannot be faked using individual discrete diodes.
Are diode forward and zener voltages the same?
A: Both diodes have the same curve in the forward direction however if the zener voltage is reverse it will breakdown at a particular voltage and remain conducting at the voltage. A regular diode will not do that the to voltage will fold back after breakdown to any voltage
What is rectifer?
Another name for a rectifier is a diode. Diodes are used to change AC into DC. They block current when placed in an electrical circuit on one half of an AC sine wave. As a sine wave leaves zero volts and begins climbing to a positive voltage along with the current, the diode allows the electrons to pass. It conducts until the sine wave reaches zero again. At the start of the negative half of the sine wave the diode blocks the passage of electrons right through to the end of this half cycle. This voltage is known as pulsating DC or half wave rectification. One conductive pulse every cycle. Full wave rectification is when 4 diodes are assembled back to back so that 2 of the diodes are conducting on the positive half cycle and the other 2 diodes are conducting on the negative half cycle. This diode set up is known as a full wave bridge. The output voltage is smoother in this configuration but still has a voltage ripple. This ripple is usually smoothed out with capacitors. This is usually the components of DC power supplies.
How do you identify base collector and emitter of transistor?
It is possible with an ohmmeter usually the can has a tab signify emitter. some plastics devices have the emitter on the right lead looking at the flat part. using an ohmmeter you may check for the two diodes inside.
Can you make a transistor by connecting two diodes back to back?
Two diodes, whether or not discreet, cannot work together as a transistor. The diodes and transistor have different profiles to optimize them for their specific functions
How many diode makes one transistor?
When investigated with an ohm-meter, a transistor resembles two diodes connected "back-to-back". But you can't make a transistor by connecting two diodes back-to-back.
How can you designed transistor using diode because no available transistor?
You cannot build a transistor with two diodes. Even though the static junction characteristics of a transistor "looks like" two back to back series diodes, there is a relationship between the two junctions that cannot be matched by just connecting two diodes together.
How do you undelete games on the action replay for dsi?
Its impossible try connecting it back on your PC and upgrade it
What is back to back diode?
A: Refers two two diodes connected as it say back to back for gates applications.
Difference between a diode and a transistor?
diode is a bipolar device and transister is a three terminal device a diode will conduct any time there is a positive voltage from cathode[-] to anode[+] following an exponetial curve of the diode. a transistor can control the same exponential curves by a voltage applied to the base.
What is the purpose of connecting two zener diodes back to back?
The back to back connected zener diodes can be used as an AC regulator producing what is jokingly called a "poor man's square wave generator". Using this arrangement we can clip the waveform between a positive value of +8.2V and a negative value of -8.2V for a 7.5V zener diode. If we wanted to clip an output waveform between different minimum and maximum values for example, +8V and -6V, use would simply use two differently rated zener diodes. http://www.electronics-tutorials.ws/diode/diode_7.html
Why do you need to structure transistor as diode?
A transistor is not a diode. It is also not a pair of back to back diodes. Two diodes connected back to back will not function like a transistor because their junctions are not in close proximity like they are in a transistor. The only reason for "thinking" that a transistor is "like" a pair of back to back diodes is for purposes of quick go-nogo testing with a multimeter, but that will only assess open, short, and leakage status, as well as polarity, but not any of the more useful things, such as hFe.
How does common emitter transistor show more temperature variation than common base transistors?
A transistor is made up of two diodes back-to-back. In a common base circuit - the load is shared between two diodes
Can a transistor be obtain by connecting the semiconductor diode back to back?
No.
How many diodes in a transistor?
There are two semiconductor junctions. Transistors are designated as NPN or PNP and a diode is an NP or PN junction depending on direction of current flow. However, the function of a transistor is different than two back to back diodes.
Which thyristor device has a gate electrode?
A: Without the gate there is only two diodes back to back. The gate is the turn on switch
