Just the day before, I was winding flat coils for another project, and at that time there were magnets bought on Express on the table. In general, the idea was in the air.
1. To wind a flat coil, you need to make a simple device.
2. The glue is pre-cured by heating the coil with an electric current, just like repairing speakers. But, however, when using deaf cheeks, it takes about a day.
3. PTFE spacers allow the spool to be separated from the fixture.
4. Additional gluing of the coil increases reliability.
5. After the glue is completely cured, the coil is deformed and has to be leveled with a hair dryer and a press. Adhesives “BF-2” and “BF-4” become elastic at temperatures above 150 ° C without deterioration of properties.
6. Get an even edge when cutting a PET bottle with scissors turned out to be more difficult than heating a piece of nichrome wire.
7. It is the process of finalizing the cabinet of the future speaker.
8. The hole is needed to attach the magnet.
9. The speaker uses several perforated neodymium magnets ordered from Ali Express. The distance between the edge of the magnet and the top edge of the speaker cabinet can be adjusted with washers.
10. The diffuser is made from some kind of cardboard packaging.
11. To assemble the movable system, I used double-sided tape.
12. The idea of using a plastic wrap as a speaker suspension was inspired by the design of an isodynamic head.
13. This is what a factory isodynamic speaker membrane looks like.
14. Fasten the diffuser to the membrane.
15. Attach the coil to the diffuser.
16. A flap of writing paper increases the reliability of the moving system.
17. Install the movable system in the speaker cabinet.
18. Install the speaker in acoustic design.
19. I have long wanted to show how you can tin an enamel wire with an aspirin tablet.
20. Be careful not to inhale these poisonous vapors!
21. It remains to add a damping filler and connect the coil leads to the cable.
22. Here’s what happened.
23. Take bottle test.
Of course, the subwoofer did not come out of the bottle, and if you watch the linked video, you can hear the distortions that appear when the bass level rises. However, the loudspeaker still emits articulate sounds, and they are definitely not worse than my first plastic computer speakers made.
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