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I-phone amp......2.1

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Project by jbschutz posted 115 days ago 1484 views 13 times favorited 9 comments Add to Favorites Watch

I-Phone amplifier….2.1 I had to try one more…..This is the single “speaker” version that allows the phone to be placed in the upright position or on its side. The open slots (see pictures) allow for sound transmission in either position, and the phone may be placed horizontally for charging hookup.
This one is made from walnut with accent strips of maple around the speaker (input) openings. I have included a sketch of the plan for the middle layer. The back piece is simply drilled with a succession of forstner bits to create a stepped cone at the back, and the projecting circular extension gives the “speaker” a bit more depth. A tapered foot at the back allows the stand to tilt back.
Middle and back layers are about 1/2 inch thick, and the circular extension is about 5/8 inch thick. Assembled with Titebond III and finished with spray poly.
This was a fun build, though routing out the channels from the back of the middle layer was a bit nerve wracking. To my ear, it works about as well as the two “speaker” model I posted earlier. Sound seems to be about doubled.

-- jbschutz www.johnschutz.com





9 comments so far

View mcoyfrog's profile

mcoyfrog

2885 posts in 2192 days


#1 posted 115 days ago

WOW

-- Wood and Glass they kick (well you know) Have a great day - Dug

View mcoyfrog's profile

mcoyfrog

2885 posts in 2192 days


#2 posted 115 days ago

I just went back and looked at the 2 speaker/hole system you made they are both cool. It looks like there is a pinhole at the back of the speaker in this one is that true or a photo thing.

-- Wood and Glass they kick (well you know) Have a great day - Dug

View RogerBean's profile

RogerBean

1088 posts in 1551 days


#3 posted 115 days ago

John,
Neat little doober. Nicely crafted. I like it.
Roger

-- "Everybody makes mistakes. A craftsman always fixes them." (Monty Kennedy, "The Checkering and Carving of Gunstocks", 1952)

View JL7's profile

JL7

6993 posts in 1562 days


#4 posted 115 days ago

That is really cool John, I like the mega-horn (mega-phone?) look!

-- Jeff - I have not failed. I've just found 10,002 ways that won't work.

View Sheisserick's profile

Sheisserick

52 posts in 443 days


#5 posted 115 days ago

What would you say, you can deduct from the shape of the holes?
1 coned-out hole works as good as 2 flat-bottom holes?
I find it hard to hear much difference if it´s a song or some music, but the real test is making speech (Like audiobooks) come out clear. Did you test that yet?

I like your addition of the ring, which almost doubles the depth of your speaker.

-- I doubt, therefore I might be

View jbschutz's profile

jbschutz

384 posts in 1289 days


#6 posted 114 days ago

Response to questions.........I really can’t determine the overall differences, effectiveness, etc of v.1 versus 2. I wanted to try the single “speaker” form and be able to have the phone work while lying on its side, too. It does seem to work equally well in both positions. The flat bottomed pair against one coned “speaker” seems like a toss-up. A friend, who is into such electronics, wants to do some sophisticated tests on the input and output to really see if there is a way to optimize the performance. At this point, I think it is basically a megaphone effect….concentrating the sound and projecting it forward. If anyone has an interest…..check out the koostics.com website. They sell several different forms of these passive amplifiers.
John

-- jbschutz www.johnschutz.com

View NimbleJack's profile

NimbleJack

9 posts in 1379 days


#7 posted 114 days ago

This is so much more elegant than what I have been using in the wood shop for the past year – a stainless mixing bowl from the kitchen. Drop your device in the bowl and rock on.

-- Jack - Olympia, Washington

View Roger's profile

Roger

14098 posts in 1401 days


#8 posted 112 days ago

This is the nicest ones of these I’ve seen. Very good.

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View Fishinbo's profile

Fishinbo

11216 posts in 773 days


#9 posted 108 days ago

Totally cool project! Looks great and like the compact design. Great job!

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