Hi ... fill ... lines/mm. This would give you 75 to 100 lines per inch. A 100 lpi will work ok, but 75 lpi is a little slim. I also printed my grating using ...
To all: Many of you know that I am probably the only guy on the list who can actually TRY to get a turned DOWN edge, and still end up with a turned UP edge. In...
Greetings: Yesterday I reacqainted myself with a hobby that I'd put into storage for several years: homebrewing. This morning, as I contemplated the bubbling ...
... I did the exact same thing last weekend! Brewed up a nice brown ale. Affinities? Similarities? "Grind more, worry less" "Relax, don't worry, have a...
Ingredient list on Trader Joe's Organic Edamame dip includes cultured dextrose (dextrose, silicone dioxide). They do not claim that the SiO2 is organic....
Michael, you wrote: "I was previously aware of the affinities between amateur astronomy and things like ham radio, amateur rocketry and computer programming...
... Dave: Let¹s see.....I bet I¹m a perfect example of the guy Michael is talking about. Mech Engineering degree, homebrews when able, spent hours making ...
Hi all, i have been doing my own anodizing, for my scope parts, with a charger/starter,, battery charger, and was wondering if theres any way posable to get...
Yes, James You are so right. Most of those things on your comprehensive list I've done too. But I am old enough to remember when ham radio operators BUILT...
... Speaking of "build your own"....what ever happened to Heathkit? I made my first volt/amp/ohm meter from a kit they sold and took their home electronics...
I built my own supply with a large Hammond transformer (cost about $50) and a big bridge rectifier. I can switch between 16 volts at 45 amps or 32 volts at 25...
Hi I am grinding a 6 inch f/8 mirror and am in the polishing stage. Im not done with polishing yet but wanted to see what a Ronchi test would look like. The...
Other afinities and afflictions? I guess you already know that I am a grounded pilot (glider and single engine), a gun nut, a ham, and a sailor. But you may...
To evaluate the Ronchi test, take and look at the spacing of the lines at the center. If the lines as they go along, they widen, then the mirror at that point...
You want to build a constant current regulator. A big FET will do nicely for a regulator although at high currents you have to be careful with the voltage...
Hi all, I have found a source of powdered rouge from a local Lapidary supplier. The colour as stated by them is a rich peach. I was always under the impression...
John: Hello, I'm going to assume you are using a starter/charger with a large transformer with an output voltage that is unregulated and uses two to four diode...
Hi Chris, you have interpreted your mirror correctly. A slightly oblate spheroid with a raised zone inside the edge. The outer edge looks turned down only...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the atm_free group. File : /Amateur...
atm_free@yahoogroups....
Oct 8, 2003 12:09 pm
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Sorry, Vladimir- It looks like I will be a while getting the article(s) in a file form that everyone can see in our files section. The files section doesn't...
An alternative to linear regulator, which requires dissipating power across an active device such as a FET, is to use feedback to PWM or switching regulator...
They may be calling CeO as rouge. Rouge is indeed a deep brick red color and that is the color of that particular version of the iron rust. CeO, depending...
Ah, you have read in/out where I said near/far. Big difference as one is unidirectional while the other isn't. Bob May http://nav.to/bobmay bobmay@......
The sad little thing about using PWM is that, unless enough filtering is used, the quality of the anodizing becomes poor as the peak current is more than...
You can find ancient books from the time of Adolf Hitler that tell you how to refine the rouge by letting it slowly settle in water. Also, you can recover...
Filtering is way easier at the higher frequencies used with PWM than at the 60Hz used with a variac or linear regulator! If you are going to rectify and filter...
thanks for all the info, now im totaly confused, as i am electricaly chalenged, , i was told the "old" adjustable chargers would work, so ill have to keep my...
... PWM is probably more complicated than a variac and bridge rectifier. But if you could design build a DIY PWM regulator and supply, it would be cheaper. The...
