C=1/(2πfR)

10 = 1/(2πfR) where F = 2KHz and R = 8Ω. OK, 10 what? Farads? Milli, Micro, Nano, Pico farads?
The power supply is 12 volts so I don't need a super high voltage cap. I'm sure 35V would be far more than ever going to be a problem. If that's 10µF I'll have to scrape through scrap stock to see if I can quickly find one. If not I understand I can take two electrolytic's and put them in series opposing polarity, but I have to keep in mind the limited space for such. If I can find a good non-electrolytic 10µF I'd be happy to give that a test run. If not - I'll go to Digikey for a cap. Maybe a kit of caps so I can have other values on hand for the times I need such.

 

10 = 1/(2πfR) where F = 2KHz and R = 8Ω. OK, 10 what?

Where does that "10" come from?
My calculator gives 9.947e-6 Farads as the value of "C" for 1/(2πfR).

 

Where does that "10" come from?
My calculator gives 9.947e-6 Farads as the value of "C" for 1/(2πfR).

1 / 2 x 3.14159 x 2 x 8 = 0.00099

Then multiply by 1000 because it was KHz?

(not saying this is correct, just speculating on how he got 10)

 

OK, so the number is "ten", and a reasonable guess is 10 microfarads. So that initial guess back in post #5 of 4.7 was not bad. And that should be close enough. And at the very low power level an electrolytic that is polarized should work very well. But if the highs seem a bit weak, put a second capacitor in parallel with the first one. The same value, of course.

 

OK, so the number is "ten", and a reasonable guess is 10 microfarads.

No! The number is 0.00001 F. Do the math, no guessing is required!

Edited: Fix the extra zero in my answer.

 

No! The number is 0.000001 F. Do the math, no guessing is required!

No, it is 0.00001 F or 10 uF

 

OK, so no matter which, 10 microfarads or one microfarad, start with a 4.7 and see what it sounds like. Either way will be an improvement over the phone speaker reproduction.
The Mac installation put the capacitor on the amplifier PCB to reduce production costs and simplify packaging.

 

Too large a capacitor can result in damage to the tweeter.

 

OK, so no matter which, 10 microfarads or one microfarad, start1th a 4.7 and see what it sounds like.

A perfect start value for No-Fi speakers.

 

Which will blowup first? The "squeakers" or the amplifier that has no audio specs?

 

We are not talking Hi-Fi here, just something better than the cell phone speakers.

 

Exactly. You can try not connecting the tweeters. Just try it with the main speaker alone.

 

REally, The tweeter speakers DO need to be connected.

And I think of the brochure on a recent TV model, touting the "GIANT" 2 1/2 inch woofers.

 

My calculator gives 9.947e-6 Farads as the value of "C" for 1/(2πfR).

That's what I got. For the sake of rounding to a common number because I doubt there's a9.947e-6 Farad cap out there.

No! The number is 0.00001 F. Do the math, no guessing is required!

Here's where I get confused.
Farad, 1F which equals
Milli-farad, 1,000MFD which equals
Micro-farad 1,000,000 µF which equals
1,000,000,000 nF which equals
1,000,000,000,000 pF.
Is that 10 MFD or 10 µF? (I know that's become an obsolete term, but that was common back in the early 70's when I first learned a little about electronics.

Too large a capacitor can result in damage to the tweeter.

So can "No" capacitor. Even worse.

We are not talking Hi-Fi here, just something better than the cell phone speakers.

EXACTLY! Yes. Thank you for reiterating that detail.

But if the highs seem a bit weak, put a second capacitor in parallel with the first one. The same value, of course.

Again, here's where I show my lack of knowledge on caps. I know paralleling resistors reduces the resistance. If I believe correctly, paralleling a cap will increase the capacitance. I am fairly confident in that statement. But when it comes to electrolytic caps (E-caps) when you put them in series does the capacitance drop? And isn't putting E-caps in series a way to get around the "E" part of it? Or let me say it different: turning an E-cap into a NON-E-cap?

To be sure, Susie was of more interest in HS than capacitors. Dames! They steal brain cells and replace them with ball sells.

 

Here's where I get confused. Farad, Milli-farad, Micro-farad and on and on to pico. Is that 10 Milli-farads?

Just look up the meaning of metric prefixes.

 

Just look up the meaning of metric prefixes.

OK, I'm taking this away:

Draws my focus to:

10^-6 is micro.

At last a clear answer. Thank you.

Now, what about doubling caps & E-caps? Parallel, series, etc.

 

To be sure, I have plenty of E-caps still in bags. I don't have any caps that are non-E-cap. Not unless I scavenge something from another board. Likely going to be surface mount. I'm not unfamiliar with SMT de-soldering and soldering, so if I can come across something small that would be good. I can even solder it to a board and add leads.

 

Found this:
Labeled

B
101K
1KV

Is that 10pF? with a code "K"?

 

Now, what about doubling caps & E-caps? Parallel, series, etc.

Caps is series have the value 1/Cs =1/C1 +1/C2 thus, two equal value capacitors in series have 1/2 the value of each.
Caps in parallel have the value Cp = C1 + C2 thus, two equal value capacitors in parallel have twice the value of each.

 

Found this:
Labeled

B
101K
1KV

Is that 10pF? with a code "K"?

I believe the value is in pF, K is 1000 and 101 is 100, so it would be 100,000 pF or 100nF.
1KV is likely the voltage rating.