Hi all, new here and like the whole site.
I'm having issues with some online electronics classes/homework.
The quest I can't find in my lesson is: All receivers, regardless of what type, have at least one:
A. Power supply
B. Tuning fork
C. Vacuum tube
D. Resonant circuit

I have it narrowed down to either A or D but not quite sure. Thanks in advance for any all all help.
Corey

 

So which of those two are absolutely required for operation even if you know nothing else about he design of the receiver circuit.

 

I found it finally! Its "D". Resonant circuit

 

So which of those two are absolutely required for operation even if you know nothing else about he design of the receiver circuit.

I know now that the resonant circuit is but thought the power supply was but found it wasn't. Thank you very much!
Corey

 

How can a receiver work without power?

And certainly you can make a receiver without a resonant circuit (although perhaps not easily) using all digital processing.

 

Very true when you put it that way for sure. Thank you.
Corey

 

How can a receiver work without power?

And certainly you can make a receiver without a resonant circuit (although perhaps not easily) using all digital processing.

Crystal radio....

The power comes from the signal itself, and not a power "supply".

But I agree that a receiver doesn't absolutely have to have a resonant circuit, either.

So I think the answer depends on what the person writing it had in mind as far as the "fine print".

 

With a topic titled Resonant Circuits, the answer was sort of a gimme. The problem is the distractors should sound feasible, but not correct.

Answer A is also correct, unless your going to discriminate between power supplies and batteries ... calling them a power source. Multiple Choice (guess) questions need good distractors to have some level of validity and a decent degree of difficulty.

 

With a topic titled Resonant Circuits, the answer was sort of a gimme. The problem is the distractors should sound feasible, but not correct.

Answer A is also correct, unless your going to discriminate between power supplies and batteries ... calling them a power source. Multiple Choice (guess) questions need good distractors to have some level of validity and a decent degree of difficulty.

Don't forget about the good ole fashioned crystal radio! No power supply. No battery. Just a long wire, an inductor (wire wound on a toilet paper tube), a capacitor (I used a two liter soda bottle with aluminum foil taped on each side), a germanium diode, and a high-impedance earphone.

 

Very true WBahn. The crystal is a resonant circuit.

Even antenna can be a bad distractor.