AVR-Chat

Thanks Russell
Anything with a bandwidth up to say a Mhz would be fine for this. I was
rather thinking along the lines of obtaining something general where I had
no need to worry about design for now and that would also be an asset for
future work. Once I have established the feasability and best approach is
the time to look at a specific input circuit.

Regards.
Doug.
  -----Original Message-----
  From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com]On Behalf
Of Russell Shaw
  Sent: 16 August 2006 01:52
  To: AVR-Chat@yahoogroups.com
  Subject: Re: [AVR-Chat] General purpose amplifier to use with AVR


  Doug Locke wrote:
  > I wonder if someone could help me with some advice please. I am trying
  > to use an AVR microcontroller to monitor an analogue signal. The
  > signal is both very low and of high impedance, so initially I wish to
  > experiment a little by using a general purpose amplifier between the
  > source and the AVR. I have found a HP 465A or a Brookdeal 9452 for not
  > too much cash. Does anyone have any experience with either instrument,
  > the HP has fixed gains of 20db or 40db while the Brookdeal is
  > apparently variable 30-100db so either has suitable gain.
  > Thanks for your time.
  > Doug Locke.

  An important thing to specify is the signal bandwidth, or what the source
  of the signal is. If you're "monitoring" the signal with a digital input,
  you just need a comparator and simple RC filter. For an ADC input, an
opamp
  amplifier and some RFI filtering will do.


  


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