Boa tarde Joel,<br><br>Que tal este:<br><br><a href="http://www.circuitstoday.com/cw-practice-oscillator">http://www.circuitstoday.com/cw-practice-oscillator</a><br><br><span style="font-family: arial; color: rgb(0, 0, 0); font-size: 130%;">A
circuit diagram that can be used for the generation of CW Morse code is
shown here.This circuit can be very useful those who would like
practice Ham Radio.The circuit is nothing but an a stable multivariate
based on NE 555.The frequency of oscillations of the circuit depends on
the components R1,R2 & C1.The circuit can be powered from a 9V PP3
battery.<br></span><span style="color: rgb(0, 0, 0);" class="Readmore"><br><br><a href="http://1.bp.blogspot.com/_kl-7x84Cuu8/Sq-yNGafF2I/AAAAAAAAAaA/Yq3GUmPMsd4/s1600-h/cw-practice-oscillator-_circuit.JPG"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 200px; height: 186px;" src="http://1.bp.blogspot.com/_kl-7x84Cuu8/Sq-yNGafF2I/AAAAAAAAAaA/Yq3GUmPMsd4/s200/cw-practice-oscillator-_circuit.JPG" alt="" id="BLOGGER_PHOTO_ID_5381716017860777826" border="0"></a><br>
<span style="font-family: arial; font-size: 130%;"><br><br><br><span style="font-weight: bold;">Notes.</span><br><br> * The POT R2 can be used for frequency adjustments.<br> * POT R3 can be used for volume adjustments.<br>
* The switch S1 can be a Morse code key.</span></span><br style="color: rgb(0, 0, 0);" clear="all"><br><br><br>73 de Luis, CT2FZI<br><br><a href="http://www.ct2fzi.net/" target="_blank">http://www.ct2fzi.net</a><br>
<br><br><br><br><br><br><br><br><div class="gmail_quote">2010/9/20 Joel Lobão <span dir="ltr"><<a href="mailto:joel.lobao@gmail.com">joel.lobao@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>Boa tarde,</div>
<div> </div>
<div>alguém tem um esquema de um oscilador fácil de construir e barato?</div>
<div> </div>
<div>A idéia é usar esse oscilador no Jamboree no Ar para que os escuteiros troquem mensagens em morse entre eles. </div>
<div> </div>
<div>Obrigado</div>
<div> </div>
<div>73 de CT1HXB - Joel Lobão</div>
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