Simple VCO

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SRC="Symb075c00b700c8ff000000.gif" HEIGHT="13" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Simple VCO</B></div> <div> <A HREF="opto_rs232_9600bps.htm" TARGET="_top" TITLE="Opto RS232 9600bps"><U><B><IMG BORDER="0" SRC="Symb075c00b700c8ff000000.gif" HEIGHT="13" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Opto RS232 9600bps</B></U></A></div> <div> <A HREF="interface_5v_cpu_on_3_3v_spi_memory.htm" TARGET="_top" TITLE="Interface 5V CPU on 3.3V SPI memory"><U><B><IMG BORDER="0" SRC="Symb075c00b700c8ff000000.gif" HEIGHT="13" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Interface 5V CPU on 3.3V SPI memory</B></U></A></div> <DIV ALIGN="LEFT"></DIV> <div> <B> <img src="/cgi-sys/Count.cgi?df=sperP19.dat|display=Counter|ft=6|md=6|frgb=100;139;216|dd=B|sh=F">  </B></div> </td> <td valign="top" height=400 BGCOLOR="#FFFFFF" TEXT="#080000"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:inline-block;width:728px;height:90px" data-ad-client="ca-pub-2650537455752702" data-ad-slot="5163197671"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <bR> <div> <B><IMG SRC="7e54e9f0.gif" border=0 width="590" height="415" ALT="VCO - naponski upravljan oscilator" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div>      Here has been presented simple VCO. That is, idea controls the frequency of oscillators, but that the potentiometer to by on long lines. Solution is simple. Voltage with the potentiometer filtered with the small electrolytic capacity (thus move disturbances) and then passed on the operation amplifier in the bridge. It controls and proportionally regulates the current source. Current feeder on the oscillator with LMC555 who in the condition oscillates up to 3MHz. Area regulations are 1:10 i.e. the decade. The exit (izlaz)signal is 5V tact of small factor fills. On the width of generated impulse influences the constant Cx * 220R (that on pins 6 and 7 LMC555  minimally 50R!). If the factor fills has been needed 50 %, was able achieve division frequencies (with D bistabilom) on the pole. Changes of area of oscillators is performed the choice Cx capacity. How large Cx larger so much has been shorter frequencies of oscillators. Cx may be and a few uF. However, if wants have the stable tact of shorter frequency, better splits the exit tact with divider, than put electrolytic capacity, who eventually could will change the value.</div> <bR> <div>      Complex is applied in the generator impusa. Two transistors in the current source are not wrapped up the additional temperature dependence because these changes compensates the operaciono amplifier. LMC555 is powered with +5V!</div> <bR> <bR> <bR> <bR> </td> </tr></table></body>