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???
03/03/05 20:10
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 		 #89036 - You can use better profesional method.
Responding to: ???'s previous message
For best accuracy, you should use mechanical low impedance switches as a relays, driven by array of Darlington transistors.

Relays are switched by 5, 12 or 24 VDC, Array of transitor can be ULA 2803 or any kind.
74HC04 with open colector can be great.

You can build feedback resistor with line of tree resitors and make shorts with relays to change range.
you need three pins for driving range.

You should use a kontraktron low impedance relay or any metrical relays. All should be screened or shielded.

List of 37 messages in thread
TopicAuthorDate
Three Gains?            01/01/70 00:00      
   Digital Pots            01/01/70 00:00      
      Re: Digital Pots.            01/01/70 00:00      
         precision digital pots can not be found            01/01/70 00:00      
   PGA are cheap too            01/01/70 00:00      
      Easiest Method            01/01/70 00:00      
         Re: Easiest method.            01/01/70 00:00      
            Need not to be a problem            01/01/70 00:00      
            Three gains            01/01/70 00:00      
               precision            01/01/70 00:00      
                  ratio is precision            01/01/70 00:00      
      Re: PGA            01/01/70 00:00      
   could you            01/01/70 00:00      
      Re: Logarithmic Amplifier.            01/01/70 00:00      
         never used one            01/01/70 00:00      
   Use three independent lines            01/01/70 00:00      
      Re: Three Independent Lines.            01/01/70 00:00      
         Not three integrators, but...            01/01/70 00:00      
            Re: Three Amp sections for three gains            01/01/70 00:00      
               Is it unity gain buffer or I to V conv.            01/01/70 00:00      
                  it's part of your rectifier            01/01/70 00:00      
                     Thanks for clarification.            01/01/70 00:00      
               Maybe some protection scheme for ADC            01/01/70 00:00      
                  Re: Some protection for ADC.            01/01/70 00:00      
   Higher resolution avoids gain switcing            01/01/70 00:00      
      Re: Higher Resolution.            01/01/70 00:00      
   You can use better profesional method.            01/01/70 00:00      
      low voltage analog switching            01/01/70 00:00      
         Re: Low voltage analog switch.            01/01/70 00:00      
            voltage            01/01/70 00:00      
            Seebeck-effect, thermo elements            01/01/70 00:00      
               better - yes            01/01/70 00:00      
               English english            01/01/70 00:00      
                  Re: English            01/01/70 00:00      
                  Thanks!            01/01/70 00:00      
      Re: Profesional method.            01/01/70 00:00      
         Mechanical relays.            01/01/70 00:00      

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