Changes between Version 14 and Version 15 of TubeBiasMonitor


Ignore:
Timestamp:
Nov 9, 2020, 4:26:21 PM (5 years ago)
Author:
Eric Hazen
Comment:

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  • TubeBiasMonitor

    v14 v15  
    1 Built a board
     1Built a board.  4x INA128 instrumentation amp input plus 2X single-ended inputs, all powered on 24V.
     2
     3INA128 can run up to 36V, LM358 up to 32V.  SRPP offset voltages are around 45V or higher, so maybe with the divide-by-two inputs it would be better run on 28V or even 30V.
    24
    35* Design: http://edf.bu.edu/svn/edf/EricHome/TubeAmp/BiasMon/bias/
     6* Schematic: http://edf.bu.edu/svn/edf/EricHome/TubeAmp/BiasMon/bias/tags/RevA/bias.pdf
    47
    58'''11/8/20'''
    … …  
    1417}}}
    1518
    16 Parts ideas:
     19Now I can at least download blinky light firmware :)
    1720
    18 * INA126 instrumentation amp powered on +/-12V WRT local GND
    19 * 3.3V Arduino mini
    20 * 16x2 LCD display e.g. https://www.sparkfun.com/products/255
    21 * Power:
    22  * 5V or 3.3V floating converter for Arduino and logic
    23  * PDM1-S5-D12-S
    24  * PDM1-S3-D12-S
    25   * +/-12V DC/DC converter (5V or 3.3V input) for INAs. 
    26 * couple of buttons?
     21
    2722
    2823Box: