Zener diode Interview Questions 

in that question part (c) it had asked "inthe same circuit the zener breakdown voltage is 2.0v. the reverse saturation current
is 0.005mA.if the GERMANIUM diode resistance could be neglected,what would be the current? then your answer would be "the current is
limited by the battery and the resistance of the diodes one in breakdown one in conduction.the current would probably increase until one of the
diodes burnt out.

but i didnt understand it. you mean the current in the circuit at that time was infitite? could
you please explane that part and same question part (d) ohmic resistance mean putting a 100 ohom
resister in series?

A) two p-n germanium diodes are connected in series opposing. A 5v battery is impresseed
upon this series arrengement. find the voltage across each junction at room temperature.
Assume that the magnitude of zener voltage is greater than 5V.

note that the result is independent of the reverse saturation current.is it also indepedent
of tempereture?

HINT-assume that the reverse saturation current floes in the circuit and then justify this
assumption.


B) if the magnitude of the zenar voltage is 4.9v,what will be the current in the circuit?
the reverse saturation current is 0.005mA.

C) inthe same circuit the zener breakdown voltage is 2.0v. the reverse saturation current
is 0.005mA.if the silicon diode resistance could be neglected,what would be the current?

D) If the ohmic resistence is 100 ohmes what is the current?



please answer me hurry!this is in emergency ! please... please......

Use this diagram:
http://img520.imageshack.us/my.php?image...

If the power supply has a ripple voltage of 100mV, calculate the ripple voltage at the load for a zener diode bulk resistance of 4K ohms and a load resistance (RL) = 2K ohm.

Hi there,

I've been working on some theories recently, and one of the counter arguments to these theories is the idea of true randomness. As far as I can tell, nothing is truly random in the world - everything is based on some form of system, even if we can't determine what system or factors are involved with current technology.

However, when doing some research on random number generators on... Wikipedia (-.- sorry!)... they mentioned Zener Diodes producing sound that *appeared* to be 'truly random'. Reading on, they seem to call it true randomness because the output cannot be predicted.

Is this not incorrect? Just because a system is unpredictable, it doesn't mean that the actual system is based off a number of non-random factors that in the future possibly could be measured and used to predict the outcome?

Basically, if something is unpredictable is 'truly random' appropriate terminology, or would something along the lines of 'random for the time being' be more accurate? Does true randomness actually exist, or is it simply a myth?

Thanks,

The AnonyMoose

A) two p-n germanium diodes are connected in series opposing. A 5v battery is impresseed
upon this series arrengement. find the voltage across each junction at room temperature.
Assume that the magnitude of zener voltage is greater than 5V.

note that the result is independent of the reverse saturation current.is it also indepedent
of tempereture?

HINT-assume that the reverse saturation current floes in the circuit and then justify this
assumption.


B) if the magnitude of the zenar voltage is 4.9v,what will be the current in the circuit?
the reverse saturation current is 0.005mA.

C) inthe same circuit the zener breakdown voltage is 2.0v. the reverse saturation current
is 0.005mA.if the silicon diode resistance could be neglected,what would be the current?

D) If the ohmic resistence is 100 ohmes what is the current?



please answer me hurry!this is in emergency ! please... please......

the design must only have diodes for rectifier (bridge type) and for filter/clipper, capacitor, resistor, zener for regulation, transformer from 220v as a primary voltage and potentiometer (excluding ICs,transistors,etc)...Help

Hi there,

I've been working on some theories recently, and one of the counter arguments to these theories is the idea of true randomness. As far as I can tell, nothing is truly random in the world - everything is based on some form of system, even if we can't determine what system or factors are involved with current technology.

However, when doing some research on random number generators on... Wikipedia (-.- sorry!)... they mentioned Zener Diodes producing sound that *appeared* to be 'truly random'. Reading on, they seem to call it true randomness because the output cannot be predicted.

Is this not incorrect? Just because a system is unpredictable, it doesn't mean that the actual system is based off a number of non-random factors that in the future possibly could be measured and used to predict the outcome?

Basically, if something is unpredictable is 'truly random' appropriate terminology, or would something along the lines of 'random for the time being' be more accurate? Does true randomness actually exist, or is it simply a myth?

Thanks,

The AnonyMoose

I'm a DIYer in Electronics but there is a problem I can't solve!
I don't know how is it possible for a circuit to to understand that is the rechargeable battery charged or not. (Without ANY TIMER)
As you know it's not possible to understand if a rechargeable battery is charged or not until you use it.
But i want to design a circuit in order to understand the amount of Energy that it has and charge it automatically if the amount of energy is under the need amount. The type of battery that I use is a car battery and its always in use in the circuit. (it could be used by different situations)

I tried to use transistors and zener diodes to design the circuit but t couldn't help because this kind of circuit is just going to show the amount of Energy at the right time not in a long time!

Any help or suggestion will be highly appreciated!
Thanks

I'm a DIYer in Electronics but there is a problem I can't solve!
I don't know how is it possible for a circuit to to understand that is the rechargeable battery charged or not. (Without ANY TIMER)
As you know it's not possible to understand if a rechargeable battery is charged or not until you use it.
But i want to design a circuit in order to understand the amount of Energy that it has and charge it automatically if the amount of energy is under the need amount. The type of battery that I use is a car battery and its always in use in the circuit. (it could be used by different situations)

I tried to use transistors and zener diodes to design the circuit but t couldn't help because this kind of circuit is just going to show the amount of Energy at the right time not in a long time!

Any help or suggestion will be highly appreciated!
Thanks

i am a beginner in making electronics project.i wanted to do a circuit which i saw in the EFY magazine(june 2008,page90).i wanted to know the function of the following components
1.the 2 zener diodes(20V,.5W)
2.MOFSET(IRF830)
3.BC548
4.C1,.220mF capacitor
i wish to know what a MOFSET is and its function.

I f possible give me a suitable link which will help me in understanding the circuit better.

diagram: http://www.alexnwolf.com
I have used a series of zener diodes to step the theoretical 680VDC down by 400VDC to produce 400VDC across the 4 diodes.

The circuit should draw about .01A across the resistor at 680VDC.

Question: Will the voltage potential stay 400VDC across the Zener diodes with an empty capacitor bank? Full Bank? Will it even work?

diagram:
http://www.alexnwolf.com

I need a way to get 5 mA of DC power at 9 volts out of 25 A of DC power at 12 volts. Can I just run leads off of it and use 3.1V Zener diodes or will the current blow them out? If so, how can I do this?

i need a circuit that uses diodes, zener, capacitor, resistances and a source Vin=15V so that i can have a Vout of 1.2 V and the current passing through it to be 160 mA. I have the type of circuit but i have problems with the diodes.

For a school project my team is designing and building a wind turbine and, since I'm the only electrical engineering major on the team, I've been assigned to work figure out how to convert the rotational energy to electrical energy. The final output should be 120VAC with the ability to provide as much power and possible. We don't know what the average rotational velocity at the generator will be. The team leader wants to use a DC generator that can produce a fair amount of power and low RPMs so they don't have to make a gearbox. I've tried telling him that it should be an AC generator but I guess he doesn't get it. I designed a diode rectifier bridge, filter capacitor, and Zener diode shunt regulator circuit to be placed between the output of the generator and the input of the inverter. This is the same basic power supply we learned 2 years ago from the same professor that has now rejected my design. Apparently he said the filter capacitor and/or regulator would waste too much energy. What should I do? Any and all help would be greatly appreciated.

If you have Vs = 8, R = 22 Ohms, Volts Vz = 5 Volts, Izk = 5 mA, Izm = 100 mA and a load resistor of 20 Ohms, how can you find the output voltage ?