QPD_2008_Control

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SAMSUNG-SGH-I337
2/20/2015 12:29:52 PM

QPD2008 Motorized Speaker

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2/26/2015 11:07:58 PM

These speakers stay flush to the ceiling when not in use or are being used for background music.

When used for home theater, they receive a signal which tells them to deploy and drop down into a more appropriate listening position where they are aimed at the listening position.

qpd_ctrl_pcb_asm

2/27/2015 9:35:18 PM

This is a SolidWorks model of a printed circuit board that I designed which provides the required 12vdc constant power to the speakers and can receive either a 12v old or 120 volt signal from a surround sound amplifier. When this signal is received the board send a 12vdc control signal to each speaker telling ti to deploy. When this control signal is not present the board removes the control voltage from each speaker causing it to retract.

20150227_211228

SAMSUNG-SGH-I337
2/27/2015 9:12:28 PM

This is an assembled but not soldered prototype of the board that I cnc machined. I didn't have any single sided 1/16” board so I used a piece of 0.070” double sided then machined off the top layer of copper to make the prototype for testing.

20150227_173007

SAMSUNG-SGH-I337
2/27/2015 5:30:07 PM

Here is a shot of machining (isolating) the traces on the mill. I am using a 3/32” 2 flute drill mill for the engraving. It is sufficient for this rudimentary PCB but wouldn't work very well if the traces were significantly smaller.

Doing it this way saves a bunch of hand wiring if I were to prototype it in the conventional manner. Plus, if I ever need to build more, it will really pay off having a PCB, even if its a DIY version.

20150227_173121

SAMSUNG-SGH-I337
2/27/2015 5:31:21 PM

I was too lazy and in a hurry to setup the different drills so I just used a 1/32” carbide end mill to interpolate all of the holes. This increased the machining time slightly but saved time finding and setting up different drill bits.

The whole machining operation took less than 20 minutes.