Circuit Project Help

[EviL.rOmina]

My teacher has asked me to make a circuit project using resistors, inductors and capacitors. He has strictly said that do not use any other things like diodes, transistors, rectifiers etc in project.
Can you guys help me in giving an idea that what should I make I have to use all the 3 things mentioned.

 

[thylacine1975]

A circuit using only passive components is going to be only .so. exciting...

Do you have any goals in mind? Without displays (e.g. LEDs) or interfaces (e.g. speakers) etc, it'll only 'do' something if you excite it externally with a signal generator/power suplly and view the output on an oscilloscope/meter.

In this case, I'd suggest building an LC filter terminated in a single resistor. You can then sweep the frequency of an applied sinusoid and plot the output amplitude (and phase) as a function of frequency - et voila! The basis of every loudspeaker crossover, RF filter, etc. Filters can also practically demonstrate the Fourier components of complex signals, such as turning square waves to sinusoids (which I think is pretty neat

 

[Kick]

you can make a RLC circuit as shown in figure and measure the current flowing through the circuit.

 

[EviL.rOmina]

Everyone in our section is making LC and RF Filters anything else ?
And yeah I am also interested in that leds or speakers project if thats possible.

A circuit using only passive components is going to be only .so. exciting...

Do you have any goals in mind? Without displays (e.g. LEDs) or interfaces (e.g. speakers) etc, it'll only 'do' something if you excite it externally with a signal generator/power suplly and view the output on an oscilloscope/meter.

In this case, I'd suggest building an LC filter terminated in a single resistor. You can then sweep the frequency of an applied sinusoid and plot the output amplitude (and phase) as a function of frequency - et voila! The basis of every loudspeaker crossover, RF filter, etc. Filters can also practically demonstrate the Fourier components of complex signals, such as turning square waves to sinusoids (which I think is pretty neat

 

[thylacine1975]

...well, your username inspires me to also mention that a Tesla coil is a completely passive circuit (effectively a resonant transformer) using only L's and C's - and a *lot* more interesting than an RF filter! Low power models are quite easy to whip up - a short length of PVC pipe, lots of wire and some high voltage Cs will get you a long way.

If you're feeling benign though, I'd suggest a speaker "crossover network" - you could connect an audio source and have the low frequency components drive one speaker, and the high ones drive a tweeter.

 

[BradtheRad]

You might construct several LC tanks, to compare various concepts.

* Demonstrate how to scale LC values to obtain different resonant frequencies.

* What is effect of doubling L value, and halving C?
*Of halving L value, and doubling C?

* Demonstrate when you change R in an LC tank, how it affects Q.

* Demonstrate the filter action when LC is in series with a signal. When LC tank is in series with signal.
* When LC series diverts signal to ground. When LC tank goes to ground.

* Demonstrate ringing effect. What configuration prolongs ringing? Etc.

 

[dimmich]

Here is funny project! Only one R, one C, one L = beautiful effect! You can change nominals of the elements, or try to combine elements. Good luck!

 

[BradtheRad]

Here is funny project! Only one R, one C, one L = beautiful effect! You can change nominals of the elements, or try to combine elements. Good luck!

Wow, that is a new one on me! Spectacular action in something so simple. It hints at secrets yet to be revealed.

Here is what happens when I apply square waves.