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Pomona model 72917 available in red and black. This is the datasheet:
**broken link removed**
There are 2 distributors in Denmark:
http://www.elfaelektronik.dk/
http://www.rsonline.dk/
E-Z Hook #8012 available in 10 colors. This is the catalog page...
Most inexpensive fans use shaded pole motors. There are speed controllers available. Just search online.
Another possibility would be to use a geared shaded pole motor such as a barbecue spit rotor or similar slow turning device to rotate your mirrored panels.
Disco speed = 140 beats per minute?
The calculation will work but the resistor value will be zero. The thing you probably aren't understanding is that an LED is not a static resistance. The forward voltage drop of the LED as specified in any data you have will vary even among LEDs from the same production lot. It will also vary...
If you're trying to calculate a resistor value for a 10mA current, you're multiplying where you should be dividing. Try R=(Vs-Vf)/I where Vs is the supply voltage, Vf is the nominal forward voltage of the LED and I is the design current. Even if your supply voltage is barely enough to drive the...
Re: LED Sequence Circuit
You need to define the elements of the display then the timing in terms of the smallest time step including off or pause times. This appears to have 5 separate elements: red LEDs, purple LEDs, white LEDs1, white LEDs2 and white LEDs3 and approximately 20 time steps...
Most computer parts suppliers have these (9-pin serial to 10-pin motherboard header), usually on a slot plate. This brand is widely available.
Hard-to-Find Made Easy! Computer Parts, Cables, A/V and Server management | StarTech.com
They are hard to find. The manufacturers show up but seem to be aligned to sell to OEMs only. You can get a complete dynamic microphone for less than $10. The Nady SP-1 and similar products from Sony and Audio-Technica are widely available. Most of the wired microphones made for old cassette...
I've been happy with my Hakko 936 but like Hewitson said, it was discontinued and replaced with the FX-888 years ago and there are many low quality counterfeit and clone 936's out there. In Europe you can get an FX-888 in black.
[HAKKO] : Soldering iron : HAKKO FX-888
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