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???
01/25/08 14:00
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 		 #149952 - Frequency control in oscillator
Responding to: ???'s previous message
A common technique is to use the sensor capacitance as the frequency determining part of an oscillator. If you use a relaxation oscillator you can transmit the square wave output of significant distances. The CMOS version of the 555 timer will do for a start.

List of 26 messages in thread
TopicAuthorDate
Opamp datasheet Question            01/01/70 00:00      
   page 3            01/01/70 00:00      
      TLC 271            01/01/70 00:00      
   Use input bias current            01/01/70 00:00      
      Use input bias current            01/01/70 00:00      
         ?what application            01/01/70 00:00      
         More info?            01/01/70 00:00      
         so, you have left the "low cost" area            01/01/70 00:00      
         opa129            01/01/70 00:00      
         I find it always a bit funny...            01/01/70 00:00      
            It's like those high-res PC sound cards ...            01/01/70 00:00      
            More details + missing detail from datasheet            01/01/70 00:00      
               Frequency control in oscillator            01/01/70 00:00      
                  relaxation oscillator            01/01/70 00:00      
                     Ssshh..            01/01/70 00:00      
                        Ssshh..            01/01/70 00:00      
                           Ap you are at it again - not a flame            01/01/70 00:00      
                              progressive evolution            01/01/70 00:00      
               have you had a look at            01/01/70 00:00      
                  sensirion.com            01/01/70 00:00      
               Link and answer            01/01/70 00:00      
                  www.hygrosens.de            01/01/70 00:00      
                     It's a double CMOS555, e.g.TLC556            01/01/70 00:00      
   Another sensor and schematic using 555            01/01/70 00:00      
      Another sensor and schematic using 555            01/01/70 00:00      
         Price            01/01/70 00:00      

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