RFI Filters for AC Power

There's a small section of pages on the web-site covering Equipment Chassis Design. Maybe a guideline on writing a chassis specification or really a ton of recommendations on what to consider when designing a chassis. That index page lists all the topics so the section of interest can be selected with out going page-to-page.

As a sub-topic of AC power modules, a new page was added to address embedded Power Line Filtering.The page has a few words, but not much guidance yet, but I really wrote it late last night. Wow looks like this is page 56 in that section...

Worst page with only about a dozen hits last year; Water Alarm Units. Maybe because it only contains one sentence of text......

Graphic; Open-Source Power Supply picture.

Seven Segment Driver

Following last months additions of Functional IC Schematics. I added a new function showing the internal gate schematic of a BCD to 7-Segment Decoder Driver. The page is also linked of the page covering a few LED Terms. It seems like I had already added a seven segment decoder page but I couldn't find it, maybe I just wanted to add it and never did.

Companies that produce LEDs, and Display Module Manufacturers.

So second new page addition for the new year, and this is blog posting 193.
Page visits are back up to 9,000 per day, and I hope next week will bring them back to their normal 9,500 a-day.

Panel Mount LED Graphics

Like so many pages before, I added a new page to hold a large graphic or pic file.
The new page covers Panel Mount LEDs. Because I already had a page covering LED Terms, it's linked off that page [added Nov. 2007].

Next Time I get to it I'll add some more data, and another graphic if I have one. Of course you could also call a panel mount LED a bulk-head mount or chassis mount LED.

The page relating to LEDs with the lowest page views in 2009 was Edison Base LED Lamp Definitions. Which makes sense, how many people know that the base of a normal light bulb is called an Edison Screw Base. Which also reminds me of the current issue with those LED Traffic Lights. Which happen to use Super Bright LED Components [added in Jan 2008].

When I first saw traffic lights using LEDs and not incandescent bulbs I looked it up on the internet; ending with a blog posting back in 2007 [Super Bright LEDs]. I even provided power consumption data for LED lights [13 watts] and incandescent lights [135 watts]. Well guess what, those LED based traffic lights don't generate enough heat to melt the snow that lands on the glass plate protecting the LEDs. So in the northern states those LED traffic lights just fill with snow until the lights are no longer visible. Opps!

Anyway first new page addition of the year.
Graphic; Panel Mount Green Light Emitting Diode.