[Amps] Led display problem

[wc6w@juno.com]

Hi Patrick,
  The old Burr Brown (now Texas Instruments) INA117 diff amp can tolerate up to +/- 200V on its inputs.  Analog Devices makes a similar part, whose number escapes my recall at the moment, which may be good for more voltage.  These can be used to measure current across a small series R.

  Voltages can be translated to ground and corrected for offsets with analog computation schemes.
 
73 & Good evening,
  Marv WC6W
  
  

  

-- Patrick EGLOFF <pegloff at gmail.com> wrote:
Hi All,
I'm new on this list...

I'm planning to build a 2m amp with a 4CX1500B tetrode.
I want it a bit state of the art and replace the meters with LED bars.

My design will be a cathode driven, DC grounded amplifier and i want to 
monitor at least screen, grid and anode current and anode voltage.

The LM3914 input seems to be always referenced to ground. No problem to 
measure the screen current for which a pole of the supply is grounded.

But a bit more difficult to measure the other currents and voltages for 
which the reference et the cathode level.

Has anyone an idea how to do that, on a simple way ?

73, Patrick TK5EP.
http://tk5ep.free.fr
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