Monday, February 25, 2019

Yet Another Passive Amp Scroll Saw Pattern.

These smartphone passive amps are probably more of a novelty than actually are useful. I have designed a few of these and I keep trying to get more volume. This is the best I have designed so far. I have not measured the volume increase but I would guess it is about a 50% to 75% increase.

It does also have another benefit. It seems to increase the fullness of the music. Maybe more bass?

I made this prototype out of Baltic birch plywood but you can also use a nice hardwood.

I added a leather seal over the opening to help keep the sound in the channel.

After I glued up the tube I sanded an angle so the cone would be angled up. It just looks better.

$12 per sheet of 12 coins plus $3.50 shipping
Inlay with a 1" Forstner Bit.
The perfect way to sign your work.

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