NE555P Precision Timer

NE555P Precision Timer
<p>https://www.youtube.com/watch?v=WqGq9Yv1d_U</p>

<style type="text/css">

table.frequency {
	text-align: center; font-size: 16px;
}

table.frequency td { border-width: 3px; border-color: black; }
table.frequency td.cell { height: 80px; width: 80px; }
table.frequency td.b_solid { border-bottom-style: solid; }
table.frequency td.b_dashed { border-bottom-style: dashed; }
table.frequency td.r_dashed { border-right-style: dashed; }
table.frequency td.t_dashed { border-top-style: dashed; }
table.frequency td.t_solid { border-top-style: solid; }
table.frequency td.l_solid { border-left-style: solid; }
table.frequency td.r_solid { border-right-style: solid; }
table.frequency td.b_solid { border-bottom-style: solid; }
</style>



<p>R = Resistance</p>
<p>C = Capacitor</p>
<p>t = Time</p>
<p>f = Frequency</p>

<table class="frequency" border="0" cellspacing="0" cellpadding="0">
<tr>
	<td></td>
	<td class="vbottom">t<sub>high</sub></td>
	<td></td>
	<td></td>
</tr>
<tr>
	<td class="cell b_dashed r_dashed "></td>
	<td class="cell t_solid r_solid"></td>
	<td class="cell b_solid r_dashed">t<sub>low</sub></td>
	<td class="cell t_dashed"></td>
</tr>
</table>

<table class="equation" border="0" cellspacing="0" cellpadding="3">
  <tr>
    <td rowspan="2">2,200uF Capacitor</td>
    <td rowspan="2">=</td>
    <td rowspan="2">2,200*10<sup>-6</sup></td>
    <td rowspan="2"> = </td>
    <td class="division">2,200</td>
    <td rowspan="2">=</td>
    <td class="division">2,200</td>
    <td rowspan="2">=</td>
    <td rowspan="2">0.0022 Farad</td>
  </tr>
  <tr>
    <td>10<sup>6</sup></td>
    <td>1,000,000<sub></sub></td>
  </tr>
</table>

<table class="equation" border="0" cellspacing="0" cellpadding="3">
  <tr>
    <td rowspan="2">f</td>
    <td rowspan="2">=</td>
    <td class="division vbottom">1</td>
    <td rowspan="2"> = </td>
    <td class="division vbottom">1</td>
    <td rowspan="2">=</td>
    <td class="division">
    	<table border="0" align="center" cellpadding="3" cellspacing="0" class="equation">
  		<tr>
        	<td class="division">1</td>
        </tr>
        <tr>
        	<td>0.693</td>
        </tr>
        </table>
    </td>
    <td rowspan="2">=</td>
    <td class="division vbottom">1.44</td>
    <td rowspan="2">=</td>
    <td class="division vbottom">1.44</td>
    <td rowspan="2">=</td>
    <td class="division vbottom">1.44</td>
    <td rowspan="2">=</td>
    <td rowspan="2">0.44526901669759 Hertz</td>
  </tr>
  <tr>
    <td class="vtop">t</td>
    <td class="vtop">0.693*(R<sub>1</sub>+R<sub>2</sub>)*C<sub>1</sub></td>
    <td><table border="0" align="center" cellpadding="3" cellspacing="0" class="equation">
      <tr>
        <td class="division">(R<sub>1</sub>+R<sub>2</sub>)*C<sub>1</sub></td>
      </tr>
      <tr>
        <td>0.693</td>
      </tr>
    </table>
    </td>
    <td class="vtop">(R<sub>1</sub>+R<sub>2</sub>)*C<sub>1</sub></td>
    <td class="vtop">(1000+470)*0.0022</td>
    <td class="vtop">3.234</td>
  </tr>
</table>

<br />

<p>t<sub>high</sub> = 0.693*(R<sub>1</sub>+R<sub>2</sub>)*C<sub>1</sub> = 0.693*(1000+470)*0.0022 = 0.693*1,470*0.0022 = 2.241162 second</p>

<p>t<sub>low</sub> = 0.693*(R<sub>2</sub>)*C<sub>1 </sub>= 0.693*470*0.0022 = 0.716562 second</p>

<p>t<sub>total</sub> = t<sub>high</sub>+t<sub>low</sub> = 0.693*(R<sub>1</sub>+2R<sub>2</sub>)*C<sub>1</sub> = 0.693*(1000+2*470)*0.0022 = 2.957724 second</p>
  1. 1 KΩ
  2. 2,200uF
  3. 470Ω
  4. NE555P