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Old 5th June 2012, 09:16 AM   #11
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Woot, found some reasonable priced woofer grills. Ordered!

Still need:
Wood
Resistors for piezo's
Batteries
Circle jig (going to make a diy jig for my router)
Some alluminium L shape for edging
Some glue/cement to join the hp10w magnets back to back.



---
I am here: http://maps.google.com/maps?ll=-21.171309,149.127210
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Old 9th June 2012, 12:07 AM   #12
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Slowly cooming together.

Amps - Lepai LP-2020+ ( has tone bypass switch) I must say they are a hell of a lot 'higher' toned than the original Lepai I bought about 5 years ago...

Click the image to open in full size.

2 batteries I scored out of a dead UPS, physically bigger than the 7 or 9ah recommended, but I guess I just need to adjust the center pocket space.
THere will be 1 battery per boominator, so when it goes flat, that's it, It will have to be recharged.

Unless I find another pair of batteries for the second boominator, then I have a 'spare' when it goes flat. ( not doing the Solar panel add on at this stage).
The batteries are sealed Lead acid, 12v, 17Ah.

Being a UPS battery, I would assume they are designed to 'run flat'?

The amp says 20w RMS, I am guessing per channel?
even if I run it at 15w continuous x 2 channels is 30w so If I use the basic formula ( not taking into consideration of any other variables)
P=VI P/V=I 30/12=2.5 Ah/I=time 17/2.5=6.8hrs

or running amp and half volume 2 x 10w
20/12=1.67 Ah/I=time 17/1.67=10.2hrs

Click the image to open in full size.

Still need:
Wood
Resistors for piezo's
Circle jig (still going to make a diy jig for my router)
Similar to this one: How to Make a Router Circle Cutting Jig
Some alluminium L shape for edging
Some glue/cement to join the hp10w magnets back to back.
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Old 9th June 2012, 12:12 AM   #13
Octavia is offline Octavia  United States
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Seems to me if you want a real Full Ranger you'd be much better off with the Audio Nirvana 10 inch.
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Old 9th June 2012, 12:41 AM   #14
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yes they would be nice, I did look at them for a full range Home theatre speaker. I think that they do detract from the original idea that it was to be a reasonable price to build and loud.

Per Pair: hp10-w's ~ $100 a pair delivered vs AN10" ~ $300 delivered

And since I have the HP10W's sitting and waiting to be connected. :-)
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Old 9th June 2012, 01:21 AM   #15
Octavia is offline Octavia  United States
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Fair enough. It's all about choices and some have had good results with motorola piezo's and it is a cheaper solution.
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Old 25th July 2012, 12:28 AM   #16
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Based on what has been going on in the boominator thread, I'm just wondering if I should put a Resistor in series with the piezo or not.

Simple Capacitance test of the pieso 130nF
so the simple RC calculator says I should use a 300Ohm resistor to get a low pass cut off of 4083Hz

Is this correct?
Is 300Ohm too high a value?

I also have some 12mm marine ply, so all I need now is to get the right value resistors and start building.

SC.
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Old 25th July 2012, 04:08 AM   #17
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The other question someone may know.

If I do a simple capacitance test with a digital multimeter, will this give me enough idea of capacitance to calculate the Series R for the piezo?
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Old 25th July 2012, 04:35 AM   #18
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Final question or explanation for now:

I need to allow 75mm for the battery I have (up from the 66mm in sketchup.

I've calculated:
lift the top so it sits on TOP instead of inside.
move the inside walls out 4.5mm to allow an extra 9mm for battery.
This leaves about 11mm x 296x296mm of space to fill which I can reduce the length by 11mm down from 900 to 889mm
OR add an additional outside 12x296x296 wall - stronger, but heavier Or is the internal dimensions not critical enough...
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Old 25th July 2012, 10:49 PM   #19
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Forget the notes on cabinet size above, final adjustments to the design are as follows:

75mm internal space
12mm for ALL wood, ie no 9mm pieces
all sides will sit ON the bottom plate, instead of inside, the top will still sit inside the walls.
External ends will be 18mm to counter act the increase in height and reduction in width to make the volume exactly the same as the Sketchup boominatorII ( I have a sheet of 18mm spare)

The width of the HP10W drivers, 1mm for cement, 2mm for the grills leaves 5mm of free play.

Not getting many answers here so I'll possibly post in the boominator thread.

Q1. Putting 5mm of spacing between the magnets cause any change?
ie if I put a 5mm sheet of PVC or wood in between to make the drivers a snug fit, drilling a hole where the magnet holes are.
Q2. BoominatorII vent shows length of the port @ 21mm, would it matter if I make it 30mm?
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Old 24th December 2012, 12:52 AM   #20
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Finished exams, Finished work for this year, almost finished building the tree house for the kids. Time to crack on to the Boominator! yeah!

It has begun!

2 at once :-)

The first cut is the depest :-)

Click the image to open in full size.

Sizing up the internals

Click the image to open in full size.

2 Boominators cut and ready for trimming up the edges, measuring the Woofers, cutting up the internal bracing, doindg the speaker routing, and vents.

Click the image to open in full size.

Nothing now until day after boxing day, the second boominator is for a mate who is going to come around and help with sanding, routing, and general building.

I expect their to be a beers involved at this stage... takes time, meticulous craftsmanship with getting the edges just right, which can be VERY thirsty work. :-)
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