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       <title>CircuitDB News</title>
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       <description>Free electronics circuits &amp; schematics!</description>
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             <title>simple touch alarm</title>
             <link>http://www.CircuitDB.com</link>
             <pubDate>Mon, 05 Dec 2011 05:50:10 +0100</pubDate>
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             <description><![CDATA[The project is all about the finger touch sensor alarm. It uses the BC547B transistor which   is a basic NPN  transistor  a  small signal NPN transistor used for general purpose audio amplifiers and switching  and a 2N6107 transistor which is intended for a wide variety of medium power switching and linear application. This little and flexible circuit consists of a touch sensor and a directly coupled transistor amplifier with a small loudspeaker as the output load. Two sensor strips of metal are mounted side by side on a 1�1 cm size mica sheet and connected to the input of the circuit. Mica sheet is composed of thin mineral mica crystals that are laminated or held together with shellac or vinyl resin. By    touching  the  sensor  with   your   finger  it  will   starts beeping, goes on for some time and then stops.  Touching   it again,   and   it   goes   again. This project can also be apply as an security system alarm  for some establishments for our homes and others. We can all make this kind of alarm since the circuit is not complicated compared to others.]]></description>
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          <item>
             <title>The effects of 1- norepinephrine</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.com</link>
             <pubDate>Tue, 20 Sep 2011 09:14:15 +0200</pubDate>
             <guid />
             <description><![CDATA[The effects of isoproterenol, l-[url=http://www.lookchem.com/1-Norepinephrine/]norepinephrine[/url], and intraaortic counterpulsation on hemodynamics and myocardial metabolism were evaluated in shock due to acute myocardial infarction. Before treatment, the cardiac index was markedly reduced, averaging 1.35 liters/min/m2. Mean aortic pressures ranged from 40 to 65 mm Hg. Decreases in coronary blood flow (mean, 68 ml/100 g/min) and in myocardial oxygen consumption (mean, 8.11 ml/100 g/min) were associated with abnormally high myocardial oxygen extractions (mean, 78%) and with lactate production (mean, 9%). Isoproterenol increased cardiac index 63% and heart rate 26%. Coronary blood flow rose an average of 12 ml/100 g/min in the face of decreased diastolic aortic pressure. Rate of myocardial lactate production increased. l-[url=http://www.lookchem.com/1-Norepinephrine/]norepinephrine[/url] increased mean aortic pressure and coronary blood flow an average of 21 mm Hg and 27 ml/100 g/min. Mean myocardial oxygen consumption rose 2.24 ml/100 g/min. While myocardial lactate production shifted to extraction (mean, 12%), myocardial oxygen extraction remained abnormally high (mean, 73%).]]></description>
          </item>
          <item>
             <title>Brief introduction of 1- norepinephrine</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.com</link>
             <pubDate>Tue, 20 Sep 2011 09:12:58 +0200</pubDate>
             <guid />
             <description><![CDATA[L-[url=http://www.lookchem.com/1-Norepinephrine/]norepinephrine[/url] (NE) is a neuroendocrine catecholamine that supports bacterial growth by mobilizing iron from a primary source such as holotransferrin to increase its bioavailability for cellular uptake. Iron complexes of NE resemble those of bacterial siderophores that are scavenged by human neutrophil gelatinase-associated lipocalin (NGAL) as part of the innate immune defense. Here, we show that NGAL binds iron-complexed NE, indicating physiological relevance for both bacterial and human iron metabolism. The fluorescence titration of purified recombinant NGAL with the FeIII�(NE)3 iron complex revealed high affinity for this ligand, with a KD of 50.6 nM. In contrast, the binding protein FeuA of Bacillus subtilis, which is involved in the bacterial uptake of triscatecholate iron complexes, has a KD for FeIII�(NE)3 of 1.6 �M, indicating that NGAL is an efficient competitor. Furthermore, NGAL was shown to inhibit the NE-mediated growth of both E. coli and B. subtilis strains that either are capable or incapable of producing their native siderophores enterobactin and bacillibactin, respectively. These experiments suggest that iron-complexed NE directly serves as an iron source for bacterial uptake systems, and that NGAL can function as an antagonist of this iron acquisition process. Interestingly, a functional FeuABC uptake system was shown to be necessary for NE-mediated growth stimulation as well as its NGAL-dependent inhibition. This study demonstrates for the first time that human NGAL not only neutralizes pathogen-derived virulence factors but also can effectively scavenge an iron-chelate complex abundant in the host.]]></description>
          </item>
          <item>
             <title>Brief introduction of Eosin-B</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.com</link>
             <pubDate>Mon, 19 Sep 2011 08:17:33 +0200</pubDate>
             <guid />
             <description><![CDATA[4',5'-Dibromo-2',7'-dinitrofluorescein, a red dye commonly referred to as [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url], inhibits Toxoplasma gondii in both enzymatic and cell culture studies with a 50% inhibitory concentration (IC50) of 180 . As a non-active-site inhibitor of the bifunctional T. gondii dihydrofolate reductase-thymidylate synthase (DHFR-TS), EOSIN B offers a novel mechanism for inhibition of the parasitic folate biosynthesis pathway. In the present study, [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url] was further evaluated as a potential antiparasitic compound through in vitro and cell culture testing of its effects on Plasmodium falciparum. Our data revealed that [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url] is a highly selective, potent inhibitor of a variety of drug-resistant malarial strains, with an average IC50 of 124 nM. Furthermore, there is no indication of cross-resistance with other clinically utilized compounds, suggesting that [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url] is acting via a novel mechanism. 
The antimalarial mode of action appears to be multifaceted and includes extensive damage to membranes, the alteration of intracellular organelles, and enzymatic inhibition not only of DHFR-TS but also of glutathione reductase and thioredoxin reductase. In addition, preliminary studies suggest that [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url] is also acting as a redox cycling compound. Overall, our data suggest that [url=http://www.lookchem.com/Eosin-B/] Eosin B [/url] is an effective lead compound for the development of new, more effective antimalarial drugs.]]></description>
          </item>
          <item>
             <title>cheap and best electrical fan regulator</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.com</link>
             <pubDate>Tue, 21 Jun 2011 08:00:46 +0200</pubDate>
             <guid />
             <description><![CDATA[one new circuit design is invented by indian electronics and communication engineer from India with lot of advantages including cost]]></description>
          </item>
          <item>
             <title>The RF port </title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.com</link>
             <pubDate>Mon, 15 Nov 2010 05:24:48 +0100</pubDate>
             <guid />
             <description><![CDATA[The [url=http://www.seekic.com/icdata/HMC304MS8___HMC304MS8E.html]HMC304MS8[/url]  is a passive high IP3 mixer in 8 lead plastic surface mount Mini Small Outline Package (MSOP). This miniature single balanced MMIC mixer is constructed of GaAs Schottky diodes and novel planar transformer baluns on the chip while not requiring any external components. The RF port is balanced via the MMIC balun while the LO port is connected directly to the diodes. LO isolations are typically 20 to 30 dB. Excellent input IP3 performance of +27 to +32 dBm make the HMC304MS8(E) ideal for high dynamic range applications.]]></description>
          </item>
          <item>
             <title>Cheap temperature logging</title>
             <link>http://www.CircuitDB.com/articles/20</link>
             <pubDate>Wed, 29 Sep 2010 23:12:51 +0200</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/20</guid></guid>
             <description><![CDATA[Using a cheap USB thermometer it is very easy to setup temperature logging using a linux pc and munin.]]></description>
          </item>
          <item>
             <title>Opening the Eken M003</title>
             <link>http://www.CircuitDB.com/articles/19</link>
             <pubDate>Tue, 06 Jul 2010 21:59:23 +0200</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/19</guid></guid>
             <description><![CDATA[How to open an Eken M003]]></description>
          </item>
          <item>
             <title>Eken M003 review</title>
             <link>http://www.CircuitDB.com/articles/17</link>
             <pubDate>Sat, 26 Jun 2010 22:18:37 +0200</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/17</guid></guid>
             <description><![CDATA[A review of the Eken M003, a $150 MID running Android from China]]></description>
          </item>
          <item>
             <title>Digital Led Chaser</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.com/articles/17</link>
             <pubDate>Mon, 28 Dec 2009 07:27:07 +0100</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/17</guid></guid>
             <description><![CDATA[This circuit uses digital circuits such as a demultiplexer and a binary counter to create patterns of &quot;moving&quot; led lights. This basic circuit is really cool when used in the dark or to light up a sign of some sort, as it creates a cool pattern that catches the eye.

The main part of the circuit is the demultiplexer 74ls138, we are going to connect the least significant bits of the output of the counter, that will select one of the pins of the demultiplexer as the output, lighting the led connected to it. The counter is wired only to count, and a clock pulse is needed to perform that function (the clock circuit is not included, but any will do, as long as it isn't too noisy)

One adaptation to use is to connect the most significant bit of the counter to another series of leds, enabling or disabling one of them so that the pattern will follow 16 leds instead of the only 8 shown here.

Circuit source: [url=http://electroniccircuitsforbeginners.blogspot.com]Electronic circuits for beginners[/url], by Zaakid Mata]]></description>
          </item>
          <item>
             <title>PC / Laptop to MP3</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.comhttp://www.CircuitDB.com/articles/17</link>
             <pubDate>Mon, 14 Dec 2009 20:44:50 +0100</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/17</guid></guid>
             <description><![CDATA[I rustled up this simple electronic circuit �of necessity�. It takes audio straight off the Internet, and puts it on a digital recorder. There are various advantages to this, not least that one can pull the audio off any computer without having to have this or that software in place first. Note that this is a digital-to-analog-to-digital conversion, so the sound will only be as good as one's computer's / recorder's analog circuits.
 
After wiring up the circuit, set your digital recorder's sensitivity to Lo or Dictation mode. Turn potentiometers VR1 and VR2 back about three-quarters, to avoid overload of the recorder (you might prefer a dual potentiometer here). Turn your computer volume up to about three-quarters, both to minimise hiss and avoid amplifier distortion.
 
Stereo Jack Plug A goes into your computer's headphone output, and stereo Jack Plug B goes into your digital recorder's microphone input. You will probably require 3 mm jack plugs at both ends. Further adjust VR1/VR2 as required for optimal recording. Happy listening!

[i:cf4dbd7fd3]You may re-publish this design, on condition that you acknowledge the designer (Thomas Scarborough) and this blog ([url]http://thomasscarborough.blogspot.com[/url]).[/i:cf4dbd7fd3]]]></description>
          </item>
          <item>
             <title>Google OS available for testing</title>
             <link>http://www.CircuitDB.com/articles/16</link>
             <pubDate>Fri, 27 Nov 2009 13:15:00 +0100</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/16</guid></guid>
             <description><![CDATA[As you might know Google is developing an operating system. It is still under development and therefor not downloadable in binary form. However, you can download the current sources from http://www.chromium.org and compile it yourself. Unfortunatle it takes too much time if just want to have a look.

So CircuitDB has compiled it for you!]]></description>
          </item>
          <item>
             <title>iPod Shuffle 2nd generation cable</title>
             <link>http://www.CircuitDB.comhttp://www.CircuitDB.com/articles/16</link>
             <pubDate>Sun, 18 Oct 2009 16:55:32 +0200</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/16</guid></guid>
             <description><![CDATA[See picture]]></description>
          </item>
          <item>
             <title>TableTopReports.com launched</title>
             <link>http://www.CircuitDB.com</link>
             <pubDate>Tue, 30 Jun 2009 22:18:43 +0200</pubDate>
             <guid><guid isPermaLink="false">news 21 at CircuiDB.com</guid></guid>
             <description><![CDATA[Today I can finally announce the launch of my new site: <a href="http://www.tabletopreports.com/" target="_blank" class="postlink">TableTopReports.com</a>. If you like tabletop games like Bloodbowl, Warhammer, Warhammer 40k or any other tabletop wargame, have a look at <a href="http://www.tabletopreports.com/" target="_blank" class="postlink">TableTopReports.com</a>.]]></description>
          </item>
          <item>
             <title>GameIO Review</title>
             <link>http://www.CircuitDB.com/articles/15</link>
             <pubDate>Thu, 07 May 2009 22:33:21 +0200</pubDate>
             <guid><guid>http://www.CircuitDB.com/articles/15</guid></guid>
             <description><![CDATA[GameIO is a slot-2 device for Nintendo DS and DS Lite that can add serveral interface to your DS to be used in your own homebrew application. Possible interfaces are: UART, MIDI, SPI, I2C, Onewire�, MMC/SD/SDIO, NAND Flash, JTAG, R/C Servo and GPIO.]]></description>
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