- Jan 9, 2007
- 314
- 0
- 0
I have been working on this project for a few weeks now (as evidenced by my numerous posts), and I finally got the materials and everything all together, and built a speaker. It has an okay frequency response graph, quite biased towards the low-end, but I'll dig. The problem is that it has severe distortion across the board, to the point of certain tones being unrecognizable (2khz sounds closer to 3khz). I am going to describe the driver's construction below, and I would like to hear any suggestions on improvements or specific changes for my next prototype.
It is a regular canning jar lid (I think it's 2.5" diameter). I used molded a silicon pad into the diameter of the back and a 1/4" thick, to help reduce vibrational effects on the frame, and for sound-dampening. It is just jammed in the back, and can be removed. The diaphragm consists of two strips of packing tape (2" wide) crossed to completely cover the top (the end with the smaller opening). The coil is wound around the bottom end of a packing-tape tube (about 5/8" diameter, two and a half winds of tape). I cannot give a count on the number of turns in the coil. This tube has the top 1-1/2" cut into strips that are used to affix the coil to the diaphragm, leaving it dangling a little above and off center of the ring magnet (neodymium n-42, 1-1/4" OD x 3/4" ID x 1/4" thick). The coil is not perfectly round.
My first thought was make a spider by securing the tape to a 2.5" O-ring, and then secure the ring using silicone caulking (like I used for the backing).
So, any thoughts?
--P.S.--
It was unbelievable when I first heard it make noise. I haven't had that kind of exhilaration since my first "hello world" project in C.
It is a regular canning jar lid (I think it's 2.5" diameter). I used molded a silicon pad into the diameter of the back and a 1/4" thick, to help reduce vibrational effects on the frame, and for sound-dampening. It is just jammed in the back, and can be removed. The diaphragm consists of two strips of packing tape (2" wide) crossed to completely cover the top (the end with the smaller opening). The coil is wound around the bottom end of a packing-tape tube (about 5/8" diameter, two and a half winds of tape). I cannot give a count on the number of turns in the coil. This tube has the top 1-1/2" cut into strips that are used to affix the coil to the diaphragm, leaving it dangling a little above and off center of the ring magnet (neodymium n-42, 1-1/4" OD x 3/4" ID x 1/4" thick). The coil is not perfectly round.
My first thought was make a spider by securing the tape to a 2.5" O-ring, and then secure the ring using silicone caulking (like I used for the backing).
So, any thoughts?
--P.S.--
It was unbelievable when I first heard it make noise. I haven't had that kind of exhilaration since my first "hello world" project in C.