Search results

Heinrich, It really comes down to what type of finish you are after. If you want a piano finish with a deep clear coat then have your painter spray the cabinets with an automotive polyurethane clear. That will look like glass if you have him wet sand after the first coat and spray again. Any...

chipwelder, The first thing you have to determine is if it is the pulley or the shaft that is the problem. If it is the main shaft I would return the drill press and get another one. If it is the pulley then you can possibly get a replacement pulley or if need be have the center bore machined...

Addendum to my last post. Heinrich, if you have not already used wood sealer to seal the bodyfiller that you used to fill minor imperfections I would have a second thought about that method. Usually the sealers that I have seen for wood would be rejected by the polyester filler and just bead up...

Heinrich, I have had this happen with better routers than a Ryobi so don't feel to bad. My Makita router has done this and so have others. If you still have some of the autobody filler use that. Fill the area that you cut to low and when it has set after a couple of hours or less if you are...

Trying to get back on the original track here I can also discuss the matching of a crossover and multiple devices. But the original question was if anyone had actually built an amplifier exactly as proposed by National Semiconductor as a Bridged / Parallel amplifier. If they did what was the...

Interesting links and conversation here. I do remember reading some of the original papers in the AES Journal years ago. A few points that I would make. I agree if you are going to use this type of circuit to extend the bass response below resonance that the seal box is preferable to the bass...

undefined.za, Thank you for the translation. My daughter would have laughed at me and say I told you about the Google translator....I see the translation is not perfect but I get the point/ It looks like a subtractive Saleen-Key 4th order Linkwitz-Riley network that is a variable crossover. I've...

Timber_MG, I agree with what you are saying in principle and also agree that the Tractrix designs are really compromised designs to overcome packaging limitation that the designers were trying to overcome. Namely they were trying to produce constant coverage conic section horns that really never...

Chipwelder, Do you happen to have a dial indicator? If you do that would be my first line of offense on fixing this problem. If not can you borrow one from somebody close to you and a magnetic base so you can find out what the run-out of the shaft and pulleys are? That would be my suggestion if...

Thanks chpwelder, I'll have to translate  the page into English to read it. My grandmother could have read that but alas she isn't around anymore. :RTFM:

BarryD, I see that this link has gone pretty cold but thought that I would respond anyway. First off that is some horn system you showed. I like it as it is so unusual in the looks department. The first thing I ever built was a curved horn as you have got here but not quite so long. I had a...

Ampdog, You are correct and we are both saying the same thing as you are. I was originally questioning if anyone had built one of the National Semi bridged-parallel amplifiers as they have in their data sheets. There was and is not crossover network in that circuit. I am again in agreement with...

That is a nice looking crossover board. It is obviously a stereo board from the little I can deduce of the input and output connector markings. I am guessing that the pots are trim pots or variable frequency points, but that is a big guess. The integrated circuits would make me guess that it is...

Chipwelder, Nice Labrador. I had one for about 16 years. Now I have two mutts from the pound that were supposed to be Sheba Inyue's but I think that they got that mixed up with Akida, they are much to big to be Shiba's. I have built a lot of speakers and up to now all of them have used passive...

dotVIBE, Very nice CAD drawing you are doing there. I don't know what you are using for a program but I like the results. I work with Solidworks and that would take awhile to do those drawings with that look. Another idea to think of that hasn't been thrown out there. You are using the dowels...

Chris, I'm beginning to think you must be correct. I haven't seen anybody who I can find with a working amplifier based on their circuit. I don't even see people talking about fixing the errors, just quite as far as that goes. You would think that as long as that circuit has been on their site...

soundadv, I guess I was brain dead when I was thinking R8, you were right on with that being a Morse taper. Haven't been in front of my mill for awhile. All R8 collects are tightened with a drawbar, whether manual or quick change. Soundadv, nice formula there, but I can't remember the last time...

Chipwelder, Thanks for the followup. I am beginning to think that there aren't many who have actually built one of the National Semi amps as they have in their data sheets. I don't know how many times I would be brave enough  to keep smoking something that I worked hard to build. That could get...

fdlsys, Sorry I guess we are just spoiled here in the US. I have no idea when you are listing your prices as I have no idea what the exchange rate is there. Yes milling machines here are cheap for a Chinese or Taiwanese copy of an American Mill.  The quality of the castings are suspect and the...

Chipwelder, That is most definitely an R8 taper collet. I have used this type of collet for years and it is standard equipment on not only your drill but also on most 3 to 5 hp milling machines. Just take a mallet or piece of wood and knock it up onto the shaft if you are unsure it is tight. You...