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Registered Member #1664
Joined: Fri Aug 29 2008, 02:05PM
Location:
Posts: 5
Hi, tis coil is so nice , i want it to be my first coil i want to make. Since it has audio in and it runs from low voltage, it seems to be the best chioce.
Sorry when my english is not that good , i am german, so be kind:)
Uzzors do u have a final shematik for me what i coud use to make PCB, since i have still a job good at the PCB factory. And i want to make a setup with 4 of those running Suround sound. ok bass is some sort of a broblem.
And how about power consumtion? U used 35-50 V would it be posible touse 12V or 24V ? i have a computer regulated power supply, do i need some kind of prtection for power spikes back to my supply??
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
By tuning the primary you can use any supply voltage you want, at any power level. Simply play with the number of turns, coupling and so forth. The audio modulation of my coil is far below satisfactory because the PLL oscillates too much. If you want good sound quality I would recommend Reaching's coil instead. For the first it uses a crystal so the nothing will be oscillating in the audio range, and secondly it modulates the power to the coil giving excellent audio quality.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
It is very possible to audiomodulate a pll coil, although I have found it works best to disable the PLL (easily done by grounding the antenna or not passing the primary through the current transformers depending on your topology) and just use it as a VCO. You can adjust the volume level by changing the high/low frequinecy limit resistors. The only problem with this method is that there is a relativley limited amount of modulation available. My coil running about 500w is loud enough to fill a decent size room (ie classroom) with audio no problem, but a little tiny coil could struggle to produce good sounding audio at high volume levels. I should point out that once you get the circuit all tuned up the audio actually sounds very good, even at my downright low 700KHz operating frequinecy the audio was about as good as my laptop speakers, although there is a lot of hiss. It isn't so much static like you would hear from an untuned radio, but more just it is harder to hear anything in the room because the their is more noise.
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Small Class E PLL Coil
