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Sci.Electronics.Design
Sci.Electronics.Design is a worldwide Usenet news group for discussions relevant to the design of electronics circuits.

There are 5370 threads in our archives.
You are currently looking at page 13 of 358.
The threads with the newest additions are listed first.




FOR SALE-RCA MARK NINE w/57 SPARE CRYSTALS-ROYCE 40 CHANNEL BASE-more-closet cleanout [2 articles]
radio shack - 19:49 24-12-08
http://shop.ebay.com/merchant/66-catalina_W0QQ_nkwZQQ_armrsZ1QQ_fromZQQ_mdoZ RCA MARK NINE TUBE AMPED CB RADIO-MIC-57 SPARE CRYSTALS 0 Bids $99.88 $200.00 Free shipping ... Read More
Replacement for BC557B and 547B which can handle 1 Amp [19 articles]
SpeedPigz - 19:38 24-12-08
Hi All I'm busy changing an existing circuit, but requires equivalents to the BC557B and BC547B which can handle up to a Max of 1 Amp switching current. I think the 547/557 ca... Read More
aluminum heatsink anodizing [204 articles]
Jamie Morken - 19:33 24-12-08
Hi, Does an anodized or painted aluminum heatsink perform better thermally than a bare aluminum heatsink for the situation of to-220 components attached to the heatsink with... Read More
Step Recovery [29 articles]
Andrew Holme - 16:28 24-12-08
Just been hanging various junk box diodes between a pair of SMA sockets, one to my signal generator, the other to my 'scope, looking for step recovery. A varicap (BB405B, possi... Read More
Merry Christmas and a Happy New Year! [2 articles]
Jim Thompson - 14:22 24-12-08
See... Newsgroups: alt.binaries.schematics.electronic Subject: Merry Christmas - MerryChristmas.jpg Message-ID: Merry Christmas and a Happy New Year! ... Read More
"New cell phone antenna tech to drastically reduce power use" [20 articles]
Joel Koltner - 12:22 24-12-08
Call me rather skeptical: (From http://www.mobileburn.com/news.jsp?Id=59 , December 19th, 2008...) "A new wireless antenna technology developed by Atif Shamim, an engineering... Read More
Another fun google conversion [4 articles]
Spehro Pefhany - 06:59 24-12-08
Google: mph in U/s Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info... Read More
Current source in front of JFET Input Amplifier [2 articles]
wolti_At - 04:55 24-12-08
Hello, I am currently working on a prototype for the second generation of an electrode amplifier. It is used to amplify the signals of pH and ISE electrodes where the former... Read More
OT: Santa Claus explained by E=mc2
04:23 24-12-08
http://www.mae.ncsu.edu/homepages/silverberg/santa/santa.html It's the relative space-time and nanorobots that makes Santa Claus overnight delivery possible. Oh and psychic pow... Read More
Design Skills Test Question [20 articles]
Jim Thompson - 02:51 24-12-08
Design Skills Test Question, what does this do... C V2-----SW1----+--||---+--74HCU04----+----OUT | | | V1-----SW3----+ ... Read More
Phone camera candidates? (MCU-if) [4 articles]
02:17 24-12-08
Any mobile phones that have an easy to interface camera that is worthwhile to rip from an otherwise broken/old unit ..? I'm looking for 640 x 480 , 6 bpp still images sensors o... Read More
A far better bet than the Electronic Vagina! [2 articles]
22:00 23-12-08
... Invest instead in the Jackrabbit Stungun! Hi everyone! It's me: Paul Burridge (the supreme innovator amongst you mere mortals.) Yes, a good many of you thought I was nut... Read More
Custom transformer [23 articles]
David Bourgeois - 19:11 23-12-08
Hi, I just built the ESR meter described at http://ludens.cl/Electron/esr/esr.html and wired a small 400:20 transformer. As expected, it doesn't have the theoretical 20:1 ... Read More
biasing 74HC14 input to 1/2 VCC for small signals [37 articles]
mook johnson - 16:23 23-12-08
I'm reviewing a design that is using a 74HC14 schmitt trigger with the input biased to 1.2 VCC and a small signal AC coupled in. the AC signal is about 400mVp-p. ... Read More
voltage regulator question adjustable voltage needed [18 articles]
panfilero - 16:14 23-12-08
Hello, ok, I'm looking at the datasheet for a 12V voltage regulator... LM340-12.... here's the datasheet: http://www.national.com/ds/LM/LM340.pdf On the first page under ... Read More
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