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	<title>Elektronik Devreler &#187; Dijital Devreler</title>
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	<description>www.edevreler.com basit elektronik projeler devreler elektronik şemalar devre şemaları</description>
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		<title>USB pil şarj devresi</title>
		<link>http://www.edevreler.com/2010/04/usb-pil-sarj-devresi/</link>
		<comments>http://www.edevreler.com/2010/04/usb-pil-sarj-devresi/#comments</comments>
		<pubDate>Fri, 02 Apr 2010 07:04:25 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=2138</guid>
		<description><![CDATA[Bu devre ile nikel kadmiyum(NiCd) nikel metal hidrid(NiHH) pillerinizi, bilgisayarınızın USB portunu kullanarak şarj edebilirsiniz. Şüphesiz Laptopunuzla çıktığınız bir seyahatte kablosuz mouse’nuzun pillerini usb den şarj etmek çok büyük bir kolaylık sağlayacaktır. Özellikler Boyut: 9,7 cmx 3cm x 1,5cm Piller: 2 adet AA nimh veya nicd Şarj akımı: 470 ma Şarj kesme yöntemi: pil sıcaklığı(33c°) [...]]]></description>
			<content:encoded><![CDATA[<p><span style="font-size: small;"><strong>Bu devre ile nikel kadmiyum(NiCd) nikel metal hidrid(NiHH) pillerinizi, bilgisayarınızın USB portunu kullanarak şarj edebilirsiniz.</strong></span></p>
<p><strong><span style="font-size: small;"><span style="font-size: medium;"><img class="alignnone" title="usb" src="http://www.novopc.com/wp-content/uploads/2008/10/usb.jpg" alt="" width="400" height="344" /></span></span></strong></p>
<p><span id="more-2138"></span></p>
<p><strong><span style="font-size: small;"><span style="font-size: medium;"> </span></span>Şüphesiz Laptopunuzla çıktığınız bir seyahatte kablosuz mouse’nuzun pillerini usb den şarj etmek çok büyük bir kolaylık sağlayacaktır.</strong></p>
<p><strong><span style="font-size: small;"><span style="font-size: medium;">Özellikler</span><br />
Boyut: 9,7 cmx 3cm x 1,5cm<br />
Piller: 2 adet AA nimh veya nicd<br />
Şarj akımı: 470 ma<br />
Şarj kesme yöntemi: pil sıcaklığı(33c</span><span style="font-size: small;">°)</span></strong></p>
<p><span style="font-size: small;"><strong>Çalışma Koşulları: 15-25C°</strong></span></p>
<p><span style="font-size: medium;"><strong>Malzeme Listesi</strong></span></p>
<p><span style="font-size: medium;"><br />
</span><span style="font-size: small;"><strong>R1 56kΩ ¼W,<br />
R2 27kΩ ¼W<br />
R3 22kΩ ¼W<br />
R4 47kΩ ¼W<br />
R5 750Ω ¼W<br />
R6 220Ω ¼W<br />
TR1 10kΩ @ 25°C termistör, approx. 3.7%/C° NTC</strong></span></p>
<p><strong>C1 0.1µF 10V kondansatör<br />
Q1 TIP32C PNP transistor<br />
Z1 LM393<br />
LED1  LED, 10mA<br />
Diğer  2- AA pil yuvası, Küçük soğutucu, USB kablosu</strong></p>
<p><span style="font-size: small;"><strong><span style="font-size: medium;">Açıklama ve Devre şeması</span><br />
Devrede </strong><strong>LM393 </strong><strong>çift voltaj karşılaştırıcısı kullanılmıştır.Çıkış akımı Entegrenin içindeki transistörler çıkış akımını 5.2ma civarında sınırlar. Q1 betası 90 olduğundan şarj akımı yaklaşık olarak 470 ma olucaktır. Böylece 2500mah lik pilleriniz beş saatin biraz üstünde bir sürede tamamen şarj olucaktır.</strong></span></p>
<p><span style="font-size: small;"><br />
<strong>Pil kapasitesi     şarj süresi<br />
700mAh NiCd       1.5s<br />
1100mAh NiCd     2.5s<br />
1600mAh NiMH    3.5s<br />
2000mAh NiMH    4.5s<br />
2500mAh NiMH    5.5s</strong></span></p>
<p><span style="font-size: small;"><span style="font-size: small;"><strong><img class="alignnone" title="devre" src="http://elektronikarsivi.net/resim/schematic.gif" alt="" width="498" height="263" /></strong></span></span></p>
<p><span style="font-size: small;"><strong>R1,R2 ve R4 gerilim bölücü olarak kullanıldığından Z1a nin evirmeyen girişinde 1,26V luk gerilim düşümü meydana gelmiştir. Bu gerilim bizim referans gerilimizdir(vref)</strong></span></p>
<p><strong>Pillere direk olarak temas halinde olan TR1 termistörü oda sıcaklığında 10kΩ ( 20C) olduğundan R3 ile oluşturduğu gerilim bölücü Z1a eviren girişine (Vtmp) 1.76 V luk gerilim uygulayacaktır.</strong></p>
<p><strong>Piller tamamen şarj olduğunda ısınıcak ve 33 C ye geldiklerinde TR1 in omik değeri 7.6kΩ a düşecek böylece Vtmp 1.26V olucaktır. Daha önceki yazılarda bahsediliği üzere karşılaştırıcılarda V- V + ya eşit olursa Çıkış 0V olur. Pil sıcaklığı 33C ye ulaştığında Z1a nın Eviren(vtmp) ve evirmeyen(vref) girişleri birbirine eşit olacak ve şarj kesilecektir. Sadece 10ma lik bir sızıntı akımı akıcaktır. Buda pek önemli bir değer değilidir.</strong></p>
<p><span style="font-size: small;"><span style="font-size: medium;"><strong>Yapım aşamaları ve baskı devre</strong></span></span></p>
<p><strong> </strong></p>
<p><span style="font-size: small;"><strong><img class="alignnone" title="devre" src="http://elektronikarsivi.net/resim/pcb2.gif" alt="" width="532" height="154" /></strong></span></p>
<p><strong>baskı devre</strong></p>
<p><strong> </strong></p>
<p><span style="font-size: small;"><strong><img class="alignnone" title="devre" src="http://elektronikarsivi.net/resim/pcb3.gif" alt="" width="668" height="200" /></strong></span></p>
<p><strong>üstten görünüş</strong></p>
<p><strong> </strong></p>
<p><span style="font-size: small;"><strong><img class="alignnone" title="devre" src="http://elektronikarsivi.net/resim/pcb4.bmp" alt="" width="834" height="253" /></strong></span></p>
<p><strong>eleman tarafı</strong></p>
<p><strong> </strong></p>
<p><strong><img class="alignnone" title="devre" src="http://elektronikarsivi.net/resim/pcb5.bmp" alt="" width="856" height="253" /></strong></p>
<p><strong>BİTMİŞ HALİ</strong></p>
<p><span style="font-size: small;"><strong>Q1 transistörünü resimde görüldüğü gibi soğutucuya bağlayın. Transistörü dik konumda bırakırsanız kırılabilir. Bu yüzden küçük bir soğutucu karta vidalayın. Resim de görülen TR1 termistörü için pil yuvasına uygun bir şekilde delik açın ve termistörü o şekilde lehimleyin. Termistör mutlaka pillere temas etmelidir. 2′li Pil yuvası bulamazsanız 4′lü alıp kesebilirsiniz. USB kablonusu ise eski cihazlardan sökebilirsiniz. Örneğin eski bir mouse’dan.</strong></span></p>
<p><span style="font-size: small;"><span style="font-size: medium;"><strong>Test</strong></span></span></p>
<p><strong>Elemanların doğru bir şekilde yerleştirildiğinden emin olun. Baskı devreyi önce gözle sonra da avometre yardımıyla kontrol edin kısa devre Ya da açık devre olmamalıdır. Herşey tamamsa sıra geldi test işlemine; Devreyi USB ye bağlayın( Harici güç kaynaklı bir hub en iyisidir).LED i kontrol edin eğer led sönükse devrenizi güle güle kullanın. Fakat yanıksa TR1 bacaklarını 330ohmluk bir direnç kullanarak anlık olarak kısa devre edin (Böylece Devre Pillerin çok sıcak olduğunu sanacaktır.) Sönmezse devre doğru çalışmıyor demektir. Tekrar gözden geçirin.</strong></p>
<p><span style="font-size: small;"><br />
</span><span style="font-size: medium;"><strong>Kullanım ve uyarılar </strong></span></p>
<p><span style="font-size: small;"><br />
<strong>Şarj işlemi bitince LED sönecektir.</strong></span></p>
<p><strong>Pillerin doğru olarak takıldığından emin olunmalıdır</strong></p>
<p><strong>Aynı tipte pil kullanmalıdır</strong></p>
<p><strong>piller mutlaka termistöre temas etmelidir.</strong></p>
<p><strong>AAA( kumanda pili) tipi pilleri şarj ederken; piller termistöre temas etmelidir.Ayrıca bu tip piller çok ısınacağından 700mah kapasitesinden yüksek pilleri şarj etmemelisiniz.</strong></p>
<p><strong>Yalnızca Şarj edilebilen(rechargeable) NiCd ve NiMH tipi pil kullanılmalıdırç</strong></p>
<p><strong>Uyarı:Devre hatalı yapılırsa bilgisayarınızda geri dönüşü mümkün olmayan hatalar ortaya çıkabilir. Bu hatalardan doğan sorumluluk size aittir. KOLAY  GELSİN..</strong></p>
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		<title>Transistör Test Cihazı</title>
		<link>http://www.edevreler.com/2010/04/transistor-test-cihazi/</link>
		<comments>http://www.edevreler.com/2010/04/transistor-test-cihazi/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 10:37:02 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=2057</guid>
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		<title>Dijital Voltmetre</title>
		<link>http://www.edevreler.com/2010/04/dijital-voltmetre-2/</link>
		<comments>http://www.edevreler.com/2010/04/dijital-voltmetre-2/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 10:35:14 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=2055</guid>
		<description><![CDATA[Şekilde 7106 A/D entegresi ile yapılan dijital panelmetre görülmektedir. Devre bu hali ile genel amaçlı bir tasarımdır. 7106 entegresi çıkış gösterge ünitesi olarak, LCD (Sıvı Kristal Ekran) displey kullanır. Devrenin giriş ölçme giriş uçları, hiç bir ön ve ek devre yok iken D.C gerilim ölçebilecek durumdadır. Ölçülebilecek gerilim miktarı, 28 ve 29 nolu ayaklara bağlı [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0167a.gif" alt="" />Şekilde 7106 A/D entegresi ile yapılan dijital  panelmetre görülmektedir. Devre bu hali ile genel amaçlı bir tasarımdır.  7106  entegresi çıkış gösterge ünitesi olarak, LCD (Sıvı Kristal Ekran)  displey  kullanır. Devrenin giriş ölçme giriş uçları, hiç bir ön ve ek devre yok  iken D.C  gerilim ölçebilecek durumdadır. Ölçülebilecek gerilim miktarı, 28 ve 29  nolu  ayaklara bağlı R ve C değerleri ile belirlenir. 28 nolu ayaktaki R  değeri 47K,  29 nolu ayaktaki C değeri 470 nF ise giriş uçlarından max. 200 mV  ölçülebilir. R  değeri 470K, C değeri 47 nF seçilirse giriş uçlarından 2V D.C  ölçülebilir. Bu  değerden daha yüksek gerilim değerleri ölçmek istenirse, giriş uçlarına  gerilim  bölücü dirençler konulmalıdır. Yukarıdaki devreye bağlanabilecek bir  gerilim  bölücü, aşağıdaki şekilde görülmektedir. Devre bu hali ile 0V&#8230;2000V  arası bir  D.C voltmetre olarak kullanılabilir.</p>
<p><img src="http://petricli.com/elektro/sema/sema0167b.gif" alt="" /></p>
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		<title>256 Basamaklı Merdiven Sinyal Üreteci</title>
		<link>http://www.edevreler.com/2010/04/256-basamakli-merdiven-sinyal-ureteci/</link>
		<comments>http://www.edevreler.com/2010/04/256-basamakli-merdiven-sinyal-ureteci/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 08:04:15 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[-]]></category>
		<category><![CDATA[1]]></category>
		<category><![CDATA[10]]></category>
		<category><![CDATA[6]]></category>
		<category><![CDATA[AC]]></category>
		<category><![CDATA[anahtar]]></category>
		<category><![CDATA[ayarlı]]></category>
		<category><![CDATA[Bir]]></category>
		<category><![CDATA[Değişimi]]></category>
		<category><![CDATA[devre]]></category>
		<category><![CDATA[Devresi]]></category>
		<category><![CDATA[Dijital]]></category>
		<category><![CDATA[El]]></category>
		<category><![CDATA[Frekans]]></category>
		<category><![CDATA[ile]]></category>
		<category><![CDATA[IR]]></category>
		<category><![CDATA[kondansatör]]></category>
		<category><![CDATA[Kontrol]]></category>
		<category><![CDATA[OLARAK]]></category>
		<category><![CDATA[Sayıcı]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=1904</guid>
		<description><![CDATA[Şekildeki devrede DAC0801 D/A çevirici entegresi kullanılarak yapılmış sinyal üreteci görülmektedir. D/A çevirici girişlerine dijital veri, 8 bitlik ileri sayıcı olarak çalışan 74193 ile uygulanmaktadır. DAC0801 D/A çeviricisinin çıkışında analog sinyale çevrilen giriş verisi, fark yükselteci olarak çalışan OP-AMP çıkışında merdiven basamağı şeklinde elde edilir. P1 ayarlı direnci ile devrenin clock frekansı ayarlanır. P2 ayarlı [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0146a.gif" alt="" /><span id="more-1904"></span><br />
Şekildeki devrede DAC0801 D/A çevirici entegresi kullanılarak yapılmış sinyal üreteci görülmektedir. D/A çevirici girişlerine dijital veri, 8 bitlik ileri sayıcı olarak çalışan 74193 ile uygulanmaktadır. DAC0801 D/A çeviricisinin çıkışında analog sinyale çevrilen giriş verisi, fark yükselteci olarak çalışan OP-AMP çıkışında merdiven basamağı şeklinde elde edilir. P1 ayarlı direnci ile devrenin clock frekansı ayarlanır. P2 ayarlı direnci ile D/A çeviricinin tam skala ayarı yapılır. S1 anahtarı, DAC0801 çıkışında tek kutuplu sinyal istendiği zaman kapatılır.</p>
<p><span style="font-family: Verdana; font-size: large;">DAC0801 TON ÜRETECİ</span></p>
<p><img src="http://petricli.com/elektro/sema/sema0146b.gif" border="0" alt="" width="247" height="178" /></p>
<p><span style="font-family: Verdana; font-size: x-small;">256 basamaklı merdiven  sinyal üretecinin  çıkışına şekildeki TON ÜRETECİ devresi bağlanırsa ilginç bir ton üreteci  elde  edilir. Merdiven sinyalin yükselen her basamağında devre çıkışında  yükselen bir  ton elde edilir. R1 ayarlı direnci ve 10nF�lık kondansatör ile ton  değişimi  kontrol edilir.</span></p>
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		<title>Dijital Volum Kontrol</title>
		<link>http://www.edevreler.com/2010/04/dijital-volum-kontrol/</link>
		<comments>http://www.edevreler.com/2010/04/dijital-volum-kontrol/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 08:02:55 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[-]]></category>
		<category><![CDATA[1]]></category>
		<category><![CDATA[6]]></category>
		<category><![CDATA[AC]]></category>
		<category><![CDATA[Dijital]]></category>
		<category><![CDATA[El]]></category>
		<category><![CDATA[IR]]></category>
		<category><![CDATA[Kontrol]]></category>
		<category><![CDATA[su]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=1902</guid>
		<description><![CDATA[Part Total Qty. Description Substitutions C1 1 0.1uf Ceramic Disc Capacitor U1 1 DS1669 Digital Pot IC (See Notes) S1, S2 2 Momentary Push Button Switch MISC 1 Board, Wire, Socket For U1]]></description>
			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0281.gif" alt="" /></p>
<table border="0" cellspacing="3">
<tbody>
<tr>
<td><strong> <span style="font-family: Arial;">Part</span></strong></td>
<td><strong> <span style="font-family: Arial;">Total Qty.</span></strong></td>
<td><strong> <span style="font-family: Arial;">Description</span></strong></td>
<td><strong> <span style="font-family: Arial;">Substitutions</span></strong></td>
</tr>
<tr>
<td>C1</td>
<td>1</td>
<td>0.1uf Ceramic Disc Capacitor</td>
<td></td>
</tr>
<tr>
<td>U1</td>
<td>1</td>
<td>DS1669 Digital Pot IC (See Notes)</td>
<td></td>
</tr>
<tr>
<td>S1, S2</td>
<td>2</td>
<td>Momentary Push Button Switch</td>
<td></td>
</tr>
<tr>
<td>MISC</td>
<td>1</td>
<td>Board, Wire, Socket For U1</td>
</tr>
</tbody>
</table>
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		<title>Step Motor Kontrol Ve Sürücü</title>
		<link>http://www.edevreler.com/2010/04/step-motor-kontrol-ve-surucu/</link>
		<comments>http://www.edevreler.com/2010/04/step-motor-kontrol-ve-surucu/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 08:02:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[-]]></category>
		<category><![CDATA[1]]></category>
		<category><![CDATA[555]]></category>
		<category><![CDATA[6]]></category>
		<category><![CDATA[AC]]></category>
		<category><![CDATA[akım]]></category>
		<category><![CDATA[Bir]]></category>
		<category><![CDATA[derece]]></category>
		<category><![CDATA[devre]]></category>
		<category><![CDATA[Devresi]]></category>
		<category><![CDATA[El]]></category>
		<category><![CDATA[Frekans]]></category>
		<category><![CDATA[gerekli]]></category>
		<category><![CDATA[Güç]]></category>
		<category><![CDATA[için]]></category>
		<category><![CDATA[ile]]></category>
		<category><![CDATA[IR]]></category>
		<category><![CDATA[ısı]]></category>
		<category><![CDATA[Kontrol]]></category>
		<category><![CDATA[Kontrol Devresi]]></category>
		<category><![CDATA[Motor]]></category>
		<category><![CDATA[Motorun]]></category>
		<category><![CDATA[Pals]]></category>
		<category><![CDATA[Sayıcı]]></category>
		<category><![CDATA[step]]></category>
		<category><![CDATA[su]]></category>
		<category><![CDATA[sürücü]]></category>
		<category><![CDATA[Tablosu]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=1900</guid>
		<description><![CDATA[Step motor, 4 fazlı sinyal ile çalışan ve herbir giriş darbesinde bir adım ilerleyen motorlardır. Bu adımlar, motor çeşitlerine göre çeşitli derecelerde olabilir. ( Devrede test edilen step motorlar 7,5° &#8216;lik adımlara sahiptir. Bu da motorun 360° dönmesi için 48 adım ilerlemesi demektir.) Step motor hem ileri, hem de geri yönde dönebilme yeteneğine ve yüksek [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0169a.gif" alt="" /><span id="more-1900"></span><br />
Step motor, 4 fazlı sinyal ile çalışan ve herbir giriş darbesinde bir adım ilerleyen motorlardır. Bu adımlar, motor çeşitlerine göre çeşitli derecelerde olabilir. ( Devrede test edilen step motorlar 7,5° &#8216;lik adımlara sahiptir. Bu da motorun 360° dönmesi için 48 adım ilerlemesi demektir.) Step motor hem ileri, hem de geri yönde dönebilme yeteneğine ve yüksek tork&#8217;a sahiptir. Step motorun doğruluk tablosu aşağıda görülmektedir.</p>
<p><img src="http://petricli.com/elektro/sema/sema0169b.gif" border="0" alt="" width="255" height="165" /></p>
<p><span style="font-family: Verdana; font-size: x-small;">Yukarıdaki şekilde adım osilatörü,  sayıcı ve faz  çoğullayıcıdan oluşan step motor kontrol devresi görülmektedir. 555 adım   osilatörü step motor için gerekli olan adım palslerini üretir. Clock  palsinin  frekansı düşük ise motorun dönüşü yavaş, frekans yüksek ise motorun  dönüşü  hızlıdır. 74191 sayıcısı motorun ileri-geri yönde dönmesini sağlayacak  sinyali  üretir. 7486 ile yapılan faz çoğullayıcı, sayıcının ürettiği sinyali  motorun 4  sargısı için çoğullar. Aşağıdaki şekilde kontrol devresi çıkışına  bağlanan güç  sürücü kat görülmektedir. Bu devre, step motorun sargıları için gerekli  olan  sinyalin, akımını arttırır.</span></p>
<p><img src="http://petricli.com/elektro/sema/sema0169c.gif" border="0" alt="" width="419" height="320" /></p>
<p><span style="font-family: Verdana; font-size: x-small;"><br />
</span></p>
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		<title>Otolar İçin Dijital Saat</title>
		<link>http://www.edevreler.com/2010/04/otolar-icin-dijital-saat/</link>
		<comments>http://www.edevreler.com/2010/04/otolar-icin-dijital-saat/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 08:01:05 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[Dijital]]></category>
		<category><![CDATA[El]]></category>

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		<title>Elektronik Saat</title>
		<link>http://www.edevreler.com/2010/04/elektronik-saat/</link>
		<comments>http://www.edevreler.com/2010/04/elektronik-saat/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 07:59:38 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[1]]></category>
		<category><![CDATA[El]]></category>
		<category><![CDATA[elektron]]></category>
		<category><![CDATA[elektronik]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=1896</guid>
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			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0181.jpg" alt="" /></p>
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		<title>Dijital Saat</title>
		<link>http://www.edevreler.com/2010/04/dijital-saat/</link>
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		<pubDate>Thu, 01 Apr 2010 07:59:14 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[Dijital]]></category>
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		<title>TTL ve CMOS Lojik Prob</title>
		<link>http://www.edevreler.com/2010/04/ttl-ve-cmos-lojik-prob/</link>
		<comments>http://www.edevreler.com/2010/04/ttl-ve-cmos-lojik-prob/#comments</comments>
		<pubDate>Thu, 01 Apr 2010 07:58:04 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Dijital Devreler]]></category>
		<category><![CDATA[-]]></category>
		<category><![CDATA[1]]></category>
		<category><![CDATA[Bir]]></category>
		<category><![CDATA[devre]]></category>
		<category><![CDATA[El]]></category>
		<category><![CDATA[ile]]></category>
		<category><![CDATA[IR]]></category>
		<category><![CDATA[ışık]]></category>
		<category><![CDATA[Led]]></category>
		<category><![CDATA[Lojik]]></category>
		<category><![CDATA[Ölçme]]></category>

		<guid isPermaLink="false">http://www.edevreler.com/?p=1892</guid>
		<description><![CDATA[Şekildeki devre, hem TTL hem de CMOS mantık seviyelerini ölçebilen schmitt tetikleyici NAND ile yapılmış bir lojik probtur. Ölçme ucu lojik-1 seviyesinde olduğu zaman bu seviye G1 ile terslenerek G2 ve G3 girişlerine uygulanır. G2 ve G3 çıkışında bu sinyal tekrar lojik-1 seviyesine çevrilir.Yeşil led ters polarma, kırmızı led doğru polarma olur. Lojik-1 seviyesini gösteren [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://petricli.com/elektro/sema/sema0185.gif" alt="" /><span id="more-1892"></span><br />
Şekildeki devre, hem TTL hem de CMOS mantık seviyelerini ölçebilen schmitt tetikleyici NAND ile yapılmış bir lojik probtur. Ölçme ucu lojik-1 seviyesinde olduğu zaman bu seviye G1 ile terslenerek G2 ve G3 girişlerine uygulanır. G2 ve G3 çıkışında bu sinyal tekrar lojik-1 seviyesine çevrilir.Yeşil led ters polarma, kırmızı led doğru polarma olur. Lojik-1 seviyesini gösteren kırmızı led ışık verir. Girişe lojik 0 seviyesi uygulanınca yeşil led yanar, kırmızı led söner. </p>
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