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Very nice! I've been thinking about doing that for ages. I actually have some blades on the workbench that I was planning on using to make a fillet knife.
Size doesn't matter. You could drive a Marshall stack with this amp, it won't get loud though. This amp will drive any 8 ohm loudspeaker, but it will only output 3/4 of a watt. So, what you are looking for in a speaker is lots of decibels per watt. Look for a high efficiency speaker one that puts out 95-100db per watt. Whether you use a 5 watt or 50 watt speaker with this amp simply won't matter.If, on the other hand, you want to increase the power output of the amp I suggest you look at other projects. This little amp really can't be modified for higher output.
Make a pattern from one of your hand planes. Or use these: http://www.leevalley.com/us/wood/page.aspx?p=63262
Sure, some people find it easier to remember a simple process rather than an imposing matrix of numbers. I did much better at math when I got to algebra and calculus and the numbers, in many cases, went away. Another example is I play lots of stuff on guitar and I can't tell you what note I'm playing or what cords. The process to play notes is much easier for me when I get rid of all the theory and dispense with memorizing the fretboard, scales, and cords. Having said that, it doesn't stop me from studying Bach.
True, I use a calculator. The point of this instructable is to show a method of multiplication for those who can't memorize all of the times tables. If you have a less complicated method using your fingers, let's see it.
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