Thanks, I'm checking yours out and subbing right now.

Nu știu

لو حضرتك فاهم فكرة التجربة باختصار ممكن تقولي لاني مش قادر افهم ؟

Don't be sorry, your english is good enough :D

TheFRiNgEguitars в5?мыс

Hard penis

Subbed back, thanks!

Copper is pretty great for scrappers. This stuff was a pain to get to though, and IIRC only one of the half-dozen or so CRT TVs that I've come across have had copper with the others all being aluminum in the degaussing wire. If this crossover was going to be used for any length of time instead of just being a sort of demonstration exercise, then yes, that is a really handy tip about keeping the windings from vibrating and rubbing through their coating.

h

what about parallel connection ?

expert20valvehlx still need to me non-polarized

It should be done "anti-parallel": this is parallel with + of cap 1 connected to - of cap 2 and vice versa.

You seem to know your stuff, what does the ten olm resistor do in the curcuit around 8:15 do?

Good lesson seen

The program is called Room EQ Wizard, and the microphone I was using is a Dayton Audio EMM-6 that came with a calibration file specific to my individual mic.

Isso mesmo amigo! Precisa ser com capacitores não polarizados, ou tem que ligar em oposição um com o outro, ou se for polarizados tem que ligar negativo com o negativo.

E mesmo. Ja respondei a outros sobre esse mesmo negocio. Eu modificei a descricao mas ninguem a le.

Thanks. Another commentator already beat you to it on the use of polarized capacitors in the video. The likelihood for cascading failure with series capacitors is a good comment too. It was an internal debate whether or not to mention it in the video. I figured that since this was a prototype built from trash and there was no way I'd be using it for longer than a couple of minutes, it'd probably be reasonably safe.

How about that someone is wrong on the Internet. I don't mean the guy that made the video either.

😄

What he has built is a 2nd order x-over. The caps make it 2nd order. Which means the frequencies that need to disappear, will drop off faster than a 1st order (just the inductor by itself).

And the crossover frequency is determined by the combination of the inductance produced by the inductor and the capacitance produced by the capacitor. You can't just blindly pick a capacitor with certain value of capacitance and pair it with a random coil, their values are related to eachother when determining the crossover frequency!

مساء تلخير

@@TheMasterOfNone ok, in making a 1000watts 4x10 with a 150 watt tweeter bass cab, how to know what wire gauge and how many turns it takes so that the tweeter will only receive the 150 watts?

Quite true. I was removing it each time because I thought that if I perfected the technique, I could wind up using the form for other coils.

Subbing back, thanks!

Isn't it C1 x C2 / C1 + C2 = C12

CME both formulas are correct. C = C1 x C2/(C1 + C2) is a special case for 2 caps in series. Mario’s formula is the general formula for any number of caps in series.

Ah, this 15" is not a subwoofer though. This was a very, very temporary test setup for a midbass cabinet with a single horn-loaded 15" driver. It is designed to cross over to a horn-loaded compression driver for the high frequencies, and the lower bass frequencies would be handled by a separate subwoofer cabinet.

Except that if you measured that way, the measurement would only be valid for one layer of windings. The subsequent layers of windings would each be longer than the previous ones.

I never bothered to read up enough on passive crossover layouts to figure out what all the different configurations are supposed to accomplish. This schematic was designed by an engineer at JBL sometime in the 1970s or earlier. It is for a 4560 cabinet / 3110A crossover. You can search online and find the 3110A schematic in PDF format.

If you go to the inductor calculator link in the description, it'll tell you how much wire you need, radius, and number of turns for a whole range of wire gauges.

What is the resistance of the speaker at 1 khz...

that was nice touch

Will you please give me one solution, how can I use 3way crossover with range controlar in sansui S3000j vintage speaker?

Tergantung koilnya dipasang di tweeter atau woofer Om..

That tolerance is only one of many. I use tons of capacitors in electronics repair and have never used any caps with that tolerance. Same date code? LOL Film caps are much better than electrolytics. Please explain...better how. Electrolytics have their place in a crossover as do film caps.

If he selected these caps from a junk box they could be of unknown lineage. Current electrolytic caps are usually 20% but older caps only made sure the capacity was at least the marked value and with Chinese caps I wish you good luck. I designed power supplies for decades so I was very aware of what cap specs were like and was careful to select t he right cap for the job. For a crossover cap you can use either a nonpolar cap or two normal electrolytics back to back (= to = or - to - so they would act as a bipolar cap), kust realize that back to back caps are not linear so they are not ideal. eople use electrolytic caps because they are cheap, Film caps are always better but they are more expensive.

There's a link in the video description for a website that lets you calculate coil diameter and how many turns of wire you need based on the gauge of the wire and desired induction of the coil.

@@TinyLittleWorkshop What is the diameter and how many laps does it expire?

لا أحسن ولا هم يحزنون لم يجرب شيئا في الميدان في البحر يضهر السباح الحقيقي

That's some nice information and it looks like you took some good time to put it all together for us. I didn't happen to use an online crossover calculator to design this circuit. This circuit is from a JBL spec sheet for the 3110A crossover and was designed in the 1970s, if not earlier. This schematic was put together way before commonplace computer modeling and all the fun tools we get to use today. I managed to create a rough, but reasonably close version of it from trash where I had no idea if the tolerances on the components were close to spec and I even wired one of the capacitors backward. It was in use for only a few minutes, mostly for making sure the schematic was correct because I've read about other factory schematics containing terrible errors or omissions. It did happen to attenuate in the correct range, at approximately the right slope for the design. I do agree that if you were designing a crossover circuit nowadays that you'd likely want a steeper slope and plenty of real world testing to verify results. Oh, and the two drivers in series were the exact same model. Sure, there will be some variations between individual drivers, but eh, it was close enough for the simple frequency sweep I needed to do. I was actually quite surprised that a modern Dayton subwoofer driver in a horn loaded JBL cabinet managed to really closely approximate the factory response, despite having all the wrong driver specs for the cab.