the “middle” as 0V reference.
The “+” is V+, the “-“ is V-.
Van: Douglas Taylor via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: zondag 13 februari 2022 18:05
Aan: Jon Elson via cctalk<mailto:cctalk@classiccmp.org>
Onderwerp: Re: DEC AXV11-C analog board
Is it possible to construct a ba
Two batteries in series, using the “middle” as 0V reference.
The “+” is V+, the “-“ is V-.
Van: Douglas Taylor via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: zondag 13 februari 2022 18:05
Aan: Jon Elson via cctalk<mailto:cctalk@classiccmp.org>
Onderwerp: Re: DEC AXV11-C
On 2022-Feb-13, at 9:04 AM, Douglas Taylor via cctalk wrote:
> Stopped fooling with the AXV11 for now. Applied various voltages to the Data
> Translation input and recorded the A/D octal values to get an idea of what
> the calibration of the board is. It looks very linear, +/-10v range.
>
>
This is a really interesting thread, I have this darn AF01 A/D converter
for a negative bus pdp8 and your issues and methods with testing would
work well for testing this thing. Bonus it does appear to have a 16 or
64 channel mux capability.
Question: Is it possible to change the driver
On 2/8/2022 7:36 PM, Jon Elson via cctalk wrote:
On 2/8/22 16:35, Douglas Taylor via cctalk wrote:
On 2/8/2022 5:22 PM, Jon Elson via cctalk wrote:
On 2/8/22 13:34, Douglas Taylor via cctalk wrote:
Update on this: I did put together a battery and voltage divider
to test the AXV11. The label
On 2/8/22 16:35, Douglas Taylor via cctalk wrote:
On 2/8/2022 5:22 PM, Jon Elson via cctalk wrote:
On 2/8/22 13:34, Douglas Taylor via cctalk wrote:
Update on this: I did put together a battery and
voltage divider to test the AXV11. The label on the A/D
module says it brings the output from
On 2/8/2022 5:22 PM, Jon Elson via cctalk wrote:
On 2/8/22 13:34, Douglas Taylor via cctalk wrote:
Update on this: I did put together a battery and voltage divider to
test the AXV11. The label on the A/D module says it brings the
output from the multiplexer to one of the external pins. I
On 2/8/22 13:34, Douglas Taylor via cctalk wrote:
Update on this: I did put together a battery and voltage
divider to test the AXV11. The label on the A/D module
says it brings the output from the multiplexer to one of
the external pins. I was able to verify that the voltage
applied to a
On Sun, Feb 6, 2022 at 9:20 AM Douglas Taylor via cctalk
wrote:
>
> Does anyone have any info on the A/D module? Who made it? Can you open
> it up? Does XXDP have a test for this?
http://www.bitsavers.org/pdf/dec/pdp11/xxdp/PDP11_DiagnosticHandbook_1988.pdf
PDP11 DIAGNOSTIC HANDBOOK 1988,
> On Feb 8, 2022, at 2:34 PM, Douglas Taylor via cctalk
> wrote:
>
> Update on this: I did put together a battery and voltage divider to test the
> AXV11. The label on the A/D module says it brings the output from the
> multiplexer to one of the external pins. I was able to verify that
Update on this: I did put together a battery and voltage divider to
test the AXV11. The label on the A/D module says it brings the output
from the multiplexer to one of the external pins. I was able to verify
that the voltage applied to a couple of the A/D inputs makes it through
the
These A/D systems use methods to isolate the sensitive analog signals
from the electrical noise and ground plane of the computer. Typically a
differential input is standard, so you will probably need wire up two
inputs.
If this is your first time with A/D, suggest you toggle in some code to
I just took another look at the AXV11 board. The A/D module has a
diagram glued on top which shows the block functions of the device. If
you look close the pin numbers are listed where signals are brought out
to the 36pin connector that plugs the module into the host board.
I may be able to
Yes, I am putting 1 into the CSR to start the conversion and I do get a
200(8) indicating that the conversion is complete. I wonder if this
means the A/D chip is OK but something else, like the multiplexer chip
or gain amp is fried.
On 2/6/2022 12:33 PM, Jerry Weiss via cctalk wrote:
Are you
Yes, I have a couple of those and they are very close to the AXV11-C,
except for the D/A. They have a similar method of working. The A/D
modules look 'identical' but I am suspicious that there are variations
of these modules that aren't readily apparent.
On 2/6/2022 12:26 PM, Nigel Johnson
Are you triggering an A/D conversion via the CSR or external signal?
Then check the A/D done bit.
See EK-AXV11-UG-02 Chapter 4.
Jerry
On 2/6/22 11:20 AM, Douglas Taylor via cctalk wrote:
I have one of these and would like to use it, however it appears to
only partially work. Here is
Now that I have thought a bit more, I think it was the DT2762
The board was made by Data Translation. There is an identical board
sold by them, in the DT2x6x series but I can'r remember the exact number.
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the
The board was made by Data Translation. There is an identical board
sold by them, in the DT2x6x series but I can'r remember the exact number.
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: tilbury2591nw.john...@ieee.org
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