It’s use of diodes, transistors and opAmps to build switches which is confusing me!

But, I’m aware that all these components act as a logic gate or a logic flow diagram when they act as a switch!

Can anyone send me the logic diagrams for following?

pn junction diodes.
Zener diode.
pnp and npn transistors in CE, CB & CC configurations.
OpAmp 741 under inverting and non-inverting conditions.

I’m very fluent with logic gates, thanks to my computer courses but I’m finding it very hard to build electronic circuits for a given function although I can draw the logic flow charts. I’m required to study only above components and if I’m thorough with the logic operations that can be done with above circuits, I must be able to draw circuits without trouble!
Joe:
Thanks. So, the only use of transistors in a logic circuit is to divide the current or just form a junction?
But, as describe here http://www.kpsec.freeuk.com/components/tran.htm#testing if Transistors can be compared a pair of Diodes, it should be possible to use them as Logic gates!

Bert K:
I’m familiar with the part you have given a link to. It’s like this, you need logic gates to build digital circuits but the problem is there are no such thing as AND gates and OR gates which you can just buy from the shop and use in your circuit in case you want to build a real working circuit from your logic diagram. ’stead, you have to use other electronic components such as diodes and OpAmps to build these gates and make a working circuit. Am a bit confused in this part of using the logic diagrams to build real circuits.
hobart_elf:
It may not be used in a real setting but for introductory electronics, they use only these components to build electric circuits by rearranging them in different ways!
Friends,
Don’t be offended but I *know* this question is outdated but my syllabi still requires it and I can’t find much help else where in the internet.

So, I need answers as to how they are used rather than arguments on why they shouldn’t be used!

I want to start learning all about electronic stuff like circuits and chips and stuff anyone know any good websites.

Thanks

Radio Shack?
Circuit board types, is there only one kind?
What Do I need to learn about Transitors Resistors, compasitors ect ect…?
What I need to know if I want to be serious about engineering electronics, or simply to modify an electronic component?

Thanks.

I like to sell a product that can compliment electronic products that these stores carry. I would like to find out how I can go about having the stores carry my product. Do they normally just rent a part of the shelf space they have or do they actually buy the product so that they can sell it themselves? Either way how can I get started in doing this? Also are there companies who help in getting me started without charging a lot of money?

I was wondering, i've seen it before, having a circuit board in between the front seats and it has a master switch, and switchs for the lights individually.
I was wondering how i can hook up my glow lights under my seats, and under the dash to a circuit board with switchs instead of plugging them into a ciggerette lighter. Also, do i run the wire from the board straight from the battery or through a fuse? Thank you

When I accelerate, from a stop or while driving, my car sputters if i press on the gas too much. I bought a code reader to see if it might be the throttle positioning sensor. My car has showed code 43 which is for Electronic spark timing circuit low voltage detected. I took my car in bcuz it would turn off when I was driving with ac on. The mechanic told me that had replaced the knock sensor because the one I had was broken (i had also gotten that code when I checked the code reader). He referred me to someone else who is good at wiring and electrical especially for GM cars. The only thing is that the guy is super busy with work and my mechanic admits he doesn't have much as much experience with such problems. Well, this morning when my car was engine was "cold", I noticed that it accelerated nicely. After about 1 min, while, driving, I wasn't able to accelerate without it sputtering/hesitating. After work, when I left the parking lot, same thing. It took off with power (3.8L), but then at the end of the street, it started to hesitate with too much gas. I am trying to find another mechanic to take a look, but if anyone has had same thing or suggestions on what I can check , I would appreciate it. Thanks!

1) an increase in current
2) no change in the current flow
3) the current to stop flowing
4) a decrease in current

in depok, jakarta, indonesia?

online?

I am getting my TV fixed and I think they are ripping me off. The cable jack broke off with a tiny little piece of the green circuit board attached to it. They said they had to replace the tuner and they are waiting on a price for that.

1. If an atom loses one or more electrons, it becomes
A. negatively charged.
B. positively charged.
C. neutrally charged.
D. heavier than before.

2. A __________ is attracted to a positive charge.
A. positive charge
B. neutral charge
C. negative charge
D. nuclear charge

3. Electric force is
A. a force that may be transferred by friction, contact, or induction.
B. an excess or shortage of electrons or protons.
C. a property that causes subatomic particles to attract each other.
D. the repulsion or attraction between electrically charged objects.

4. The amount of charge that produces the field and the distance from the charge determine
A. the size of an electric force.
B. the strength of an electric force.
C. the brightness of an electric field.
D. the weight of an electric force.

5. Static discharge occurs when
A. a pathway through which charges move suddenly forms.
B. two electric charges come in contact with each other.
C. an excess or shortage of electrons occurs.
D. like charges repel and opposite charges attract.

6. Increasing the distance between two objects will
A. cause an excess number of electrons to be present.
B. increase the electric force between the objects.
C. reduce the electric force between the objects.
D. not change the electric force between the objects.

7. In a direct current, electric current flows
A. back and forth.
B. and regularly reverses direction.
C. in one or more directions.
D. only in one direction.

8. __________ is the continuous flow of electric charge.
A. Resistance
B. Electric current
C. A superconductor
D. Voltage

9. Electric current __________ through electrical conductors.
A. flows easily
B. encounters resistance
C. is insulated
D. does not flow

10. Alternating currents
A. cannot flow through conductors.
B. only move in one direction.
C. regularly reverse directions.
D. cannot be insulated.

11. All of the following are good insulators EXCEPT
A. Wood
B. Rubber
C. Copper
D. Plastic

12. Resistance is __________ to the flow of __________.
A. the opposition; protons
B. the opposition; electric charges
C. a conductor; electric charges
D. not related; electric charges

13. A wire must be connected in a loop that includes an energy source in order for
A. a charge to be stopped.
B. a proton to transfer.
C. a photon to form.
D. a charge to flow.

14. If current increases while resistance remains constant, voltage will
A. not change.
B. decrease.
C. increase.
D. be reduced by half.

15. If current decreases while resistance remains constant, the voltage will
A. not change.
B. decrease.
C. increase.
D. be reduced by half.

16. According to __________, a circuit’s __________ is equal to resistance multiplied by current.
A. the law of circuits; total current
B. the law of voltage; voltage
C. Ohm’s law; voltage
D. the law of voltage; charge

17. What voltage source converts chemical energy into electrical energy?
A. Battery
B. Multimeter
C. Flashlight switch
D. Insulators

18. A material’s thickness, length, and temperature affect the material’s
A. amplitude.
B. resistance.
C. conductivity.
D. insulation.

19. What happens if one element stops functioning in a parallel circuit?
A. Devices plugged into electrical outlets will not operate.
B. None of the elements will operate.
C. Only one element will still operate.
D. The rest of the elements will still operate.

20. In what type of circuit does the charge have only one path through which it flows?
A. Flowing circuit
B. Electromagnetic circuit
C. Series circuit
D. Parallel circuit

21. A __________ works when a wire in the center melts if too much current passes through it.
A. Fuse
B. Current blocker
C. Safety
D. Independent circuit

22. An analog signal is produced by
A. encoding information as a string of ones and zeros.
B. not changing the voltage or current in a circuit.
C. continuously changing the voltage or current in a circuit.
D. pulsing a current on and off.

23. A semiconductor is a __________ that conducts current only under certain conditions.
A. high-voltage liquid
B. a crystalline solid
C. diode
D. transistor

24. Vacuum tubes do all of the following EXCEPT
A. Turn a current on or off
B. Change alternating current into direct current
C. Act as a semiconductor
D. Increase the strength of a signal

25. Which of these technologies uses a digital electronic signal?
A. Digital video disc (DVD)
B. Audio cassette tape
C. Video cassette tape
D. AM radio