jwzumwalt

I suggest you re title this article.This is not a high gain amplifier - it is a ***pre-amp***. Industry standard gain for a audio pre-amp is 1-2vpp. .5w will not drive a speaker larger than 2-3" so it really will only drive a very meager set of low power headphones.

I am a aircraft mechanic and also use a copper based bearing grease product as anti-seize for spark plugs - works great! Champion makes a supposed anti-seize that looks very thin and black for aviation. my experience and all mechanics I have talked to believe it doesn't work.

When I was a teenager we would put a dab of silicone caulk on the threads of model airplane engines to keep them from vibrating off. I still use this technique occasionally. It holds the bolt but can still be removed. It is much faster and cheaper than heat shrink.

I have been saving tips for personal use and found your link helpful - THANKS!

This came at the right time. I just got access to an unlimited supply of pallets and picked several up to experiment. Now I know ho to salvage the wood - thanks.

When I was a teenager we would put a dab of silicone caulk on the threads of model airplane engines to keep them from vibrating off. I still use this technique occasionally. It holds the bult but came still be removed. It is much faster and cheaper than heat shrink.

Brings new meaning to "don't forget the emergancy gas can!"

This is the type of project I love Instructables for. I will never build one but I appreciate the design effort and enjoy knowing how it is done - nice job.

I don't own a 3d printer - I have been price watching. But, it looks to me like the body could be built in two pieces and the handle attached as another piece. I don't expect Instructable authors to provide EXACTLY what I need - just a good starting point. Should Instructables ban cooking and welding projects because not everyone ones a microwave oven or mig, tig, and plasma cutter?

Perhaps a better option is to use the L293 (no 'D') which is rated at 1amp per output.

Ultrasonic won't work. One of the ways you test the quality of a ultrasonic tank is to put thin aluminum in it and see if it starts to disintegrate it after a minute or so. Aluminum is very sensitive to "work hardening" which in layman's language means bending (vibration). That's why airplanes are sent to the bone yard after a certain number of years.

Yes, the paint used on the Zeppelin was a mixture of iron and aluminum oxide - which was later used as rocket propellant. There is some photographic evidence that static electricity sparked the paint at the rear back side. Zeppelin became aware of this after the accident and went to great length to cover the mistake up so they were not held liable.

I am an a retired A&P mechanic. Caustic soda will not work - it attacks the aluminum. Mechanics must use other means (solvent) to clean oily aluminum case aircraft engines. Car engines (steel & iron) can be boiled in caustic soda.

What was the outside temperature when you heated the water to 175deg?

As mentioned, this is a DC pulse (square wave). In order for it to be AC it must have reverse current (that's what alternating means). In this case, the current is being turned on and off, but it does not reverse in direction, which would be needed to be AC.

Your math is wrong. Its 6W

I have one setting on my desk and it is 25ohms

You can connect a 40 or 60W bulb directly to the 12v. The filament in the bulb is nothing more than a resistive wire (like a toaster). This technique is commonly used in remote places in an emergency (I lived in Alaska for 40yrs). For the wise crackers that commented already, resistive components could care less whether it's AC or DC. They run on current not volts. This is also the same principle hobbiest use for hot wire foam cutters.

I hate to spoil your fun ( I do understand the adventure of experimenting), but you can run incandescent light bulbs directly off the 12v battery. Buy choosing different wattage bulbs (different resistance) the bulbs will burn at different brightness.

As I mentioned above, if a LM386 won't do it, then I prefer the tda2822. It is up to 3w stereo and can be used with microprocessor supplies; 3-15v. Almost all my work ends up on 3-5v now days. I rarely use a 6-12v pwr supply.How things change. 40years ago I usually needed 67-1/2v & 48v A&B power, then it was 24v, then 12v, now its 5v !!!

I prefer the tda2822 over the 7052. It is up to 3w stereo and can be used with microprocessor supplies; 3-15v.

I am not trying to dishearten you, but "a book on audio" is far to general a request. I would suggest you study 1 and two transistor audio amplifiers. That will pretty much get you grounded an theory, termonolgy, and circuit design.http://www.colorado.edu/physics/phys3330/PDF/Exper... http://www.electronics-tutorials.ws/amplifier/amp_...look at the bottom of the second link for about 10 additional related topics

You are right, but I still have about 40 of these in my parts drawer and I keep coming back to them :)

Thanks for the extra effort and details. This SOOO much better than most the chip instructible where someone just redrew a Google standard circuit and slapped it on thier Arduino, Raspberry Pie, or head phones - :)

What a great idea, I need a couple tape dispensers but have held off purchasing because Wally World and Staples want $17 dollars for a basic one. I picked up a couple good looking wood pallets for small wood projects like this.Thanks for the inspiration!

What a great idea, I need a couple tape dispensers but have held off purchasing because Wally World and Staples want $17 dollars for a basic one. Thanks for the inspiration!

I am enjoying your mini LM358 series of articles - keep it up :)

It is the free professional quality kicad program.http://kicad-pcb.org/download/

Please provide specs!A good informative instructable will give the critical specs in the first one or two paragraphs. What are the operating voltage and amperage limitations. You don't know, be honest and say you don't know the limits but it was tested with this or that...

This is Soooo neat! I will never do it, but it is very gratifing to know it can be done, and how it is done. Thanks!

I was a volunteer minister in prisons for several years. There is a long list of things the inmates do because many common objects and substances are banned. One of the things they use toothpaste for is GLUE. They even hang pictures and make paper mache` objects. A prison official said it is commonly used to make handles on sharp objects - such as "ice pick" weapons.

I have used it on my reading glasses and scratched CD roms. It "improves" them but does not eliminate the scratches. It does not seem to work on DVD's because the data tracks require better resolution.

When you brush your teeth in the morning, it is too late to use it as a global contraceptive :)

That's a great idea. I'll give it a try next time I am caught without any. I have tried lathering soap but it still rips your face off!

Oh... So this is click bait and not meant to be truly informative?

What does "works pretty good for low voltage and low frequencies" mean? Please include some relavent specs in the first one or two paragraphs so we can see if the project is applicable to our needs...

This great! I was planning on something simular using engine sensors but I had not thought of using the existing OBD output. Thanks for the great insperation :)

Your Code.rar file actually downloads as a *.tmp file and looks like an incomplete download. I suggest you get the file name corrected to .rar

The IRFZ44 is rated up to 40W. It would be interesting to see someone with the math know how to calculate the watts of this project.

FYI - I had never seen one of these before... I found this short article on how the "Bow Tie" works.http://www.antenna-theory.com/antennas/wideband/bowtie.php

Several of the western states that I have lived in require a mechanical transfer toggle switch (double pole, double throw). They have the mechanical handle and blade like a Frankenstein movie. You insert this switch/box between the main line to your breaker box. One position feeds from the electrical pole, while the other position feeds from the generator. This prevents the linemen from being electricuted by your generator.

You are right! I think they call it silicon abuse :)

Yes, I abused it! But, at least it gets to share electrons (through emf) and hang out with its 3ghz friend.

Thanks for the correction. I was not aware of the FCC changes and appreciate your kind manner in bringing me up to date :). I will delete my post, so that I do not confuse someone else new to the sport.

You can get the same effect with less trouble by just wiping the wood with a damp cloth. The wood fibers will stick up :)

Good point. This got me to thinking about when I use to pressure wash before painting. If you get the pressure washer too close to the wood it will remove about 1/16" of the soft grain; the effect leaves a very polished look, simular to drift wood - another possibility!

Other things that I was told about but did not work for ants was Ajax, Borax, vinegar, etc

Two things I regularly use baking soda for...1) Gap filler for glue - especially epoxy and super glue. Makes the glue much softer and eaysier to sand. 2) Polish, ie. auto plastic parts such as headlights covers.

I tried this for ants in the Seattle area and it did not work :(

Can this be done with bananas?

I'v been salvaging pallets that still have good lookinh lumbre on them and this looks like a great first project!

Cheapist I found tweezers was $2.16Do a search for "SMD Inductor Test Clip Probe Tweezers" on Aliexpress.com

I wished I had thought of this when I worked for the Fire Dept. We had problems with folks taking foods. We had one fellow that would spit into his milk jug during shift change - he never worried about his milk being drank!

I was thinking the same thing :) It wouldn't take much to add some led lights and small fish such as neon's and you would really have something... I may try this.

The US, Myanmar (Burma) and Liberia, are the only countries in the world not using or switching to the metric system. Congress passed the Metric Conversion Act of 1975 "to coordinate and plan the increasing use of the metric system in the United States". Voluntary conversion was requested.

Congress passed the Metric Conversion Act of 1975 "to coordinate and plan the increasing use of the metric system in the United States". Metric is the official US measurment system. However, Detroit refused to comply even though they had to retool their assembly lines every 2-3 years.The United States is one of only three countries, as of 2016, with Myanmar (Burma) and Liberia, that have not adopted, or are not in the process of adopting, the metric system as their official system of weights and measures.

When I saw this it made me think what a great idea it would be to mount two solar panels that look like wings and you would have a glow bug!

This project looks like a good candidate for wood pallets too.

Please post your stripcad file :)

Great idea, I think I will make one :)Here is a sketch

Thanks for the link. I suggest you update the description for this part, it has nothing to do with tube lights :)

Would you please provide a link for the coupler. I do not recognize this as a electrical part for lights.

Nice project with minimum tools.

Nice project! It's ideas like this that make subscribing to this list worth it.One suggestion... I think it would be a great tweak to make with wood shaped like a gun grip to make holding and pointing easier - thanks for sharing!

Just a thought for those thinking of running out and sharpening their whole index. Most bits have nitride coatings a few thousandths thick. Once you touch the tip to a sharpener it will dull twice as fast. Therefor never sharpen a drill the first time until you must. After that you will have to sharpen it frequently.

Thanks! I'v always wanted something that made consistent edge distance holes and you've solved all the head scratching :) The only thing I might add is dowl pins on 1/2" centers so that strips can be quickly butted at cordinal distances.

So lets see... the UN says the average person can live on 100x100ft (1/4 acre). Of course climate varies.Conservatively, 1500-lb per acre if no fertilizer or optimization is used.= 1500/.25 to get a 1/4 acre is 375-lb per year for 1 person, = 31-lb per monthYa, it makes sense, that's about 1lb per day. Add a little rice or beans and a chicken or goat once in awhile and a person could pretty much eat off the land. I guess the frontier pioneers knew what they were doing!

Great tip. I did a google search and found "food grade" used by farmers for about $30 US dollars for 50lb sack. (They put it in grain sillos)

This is an idea that I would expect to see on "Shark Tank" and you should be making several thousand dollars a year. This isimpler than another humane trap I have ever seen :)