Author Topic: High Precision 10 V Reference - Analog Devices AD587KN + AD7535JN + 5x OP07CJ  (Read 2564 times)

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Offline DC1MC

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Here's my update version and some notes at the end:
      A        B        C
01  A2K_00   A2K_01   A2K_02
02  A2K_03   A2K_04   A2K_05
03  A2K_06   A2K_07   A2K_08
04  A2K_09   A2K_10   BCD_00
05  BCD_01   BCD_02   BCD_03
06  BCD_10   BCD_11   BCD_12
07  BCD_13   BCD_20   BCD_21
08  BCD_22   BCD_23   BCD_30
09  BCD_31   BCD_32   BCD_33
10  A2K_11  xxxxxxx  xxxxxxx
11  -15V     -15V     -15V
12  -15VX    -15Vx    -15Vx  (IC20 - OP07)
13  +15V     +15V     +15V
14  +15VX    +15Vx    +15Vx  (IC20 - OP07)
15   GND      GND      GND 
16   GND      GND      GND 
17   +5V      +5V      +5V 
18   +5V      +5V      +5V 
19 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
21 xxxxxxx  xxxxxxx  xxxxxxx
22 xxxxxxx  xxxxxxx  xxxxxxx
23 xxxxxxx  xxxxxxx  xxxxxxx
24 xxxxxxx  xxxxxxx  xxxxxxx
25 xxxxxxx  xxxxxxx  xxxxxxx
26 xxxxxxx  xxxxxxx  xxxxxxx
27 xxxxxxx  xxxxxxx  xxxxxxx
28 xxxxxxx  xxxxxxx  xxxxxxx
29 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
31 xxxxxxx  xxxxxxx  xxxxxxx
32 GND_12V  GND_12V  GND_12V


NOTES:
- The LE signal of the BCD inputs is not on the connector, is a NOR output (IC4 74HC32), it could be that the data outputs of the 2K EPROM are used to do some switching.
- Interesting to see how the relays are controled, therr is this beefy ULN Darlington array.
- Is U20 the final amplifier for the output or is special put for the DAC reference voltage ?

 Cheers,
 DC1MC
 

Offline FransW

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While rearranging my stuff, I found a bunch of the Erni connecters.
Male & female, straight & 90 degr bended, used.
If anyone is interested, please contact me by PM.
Regards,
Frans
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline Bad_Driver

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I will start these days with the analog part behind the DAC (analog side).
For our convenience I try to model it in Multisim. Seems to be standard design following data sheets.

I will use my board with the DIP OPs since they are easier to lift for testing because I want to avoid any kind of damage to the OPs.
But plz don't expect a finalized schematics this week. It will take time due to real life impact.
 
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Offline DC1MC

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I will start these days with the analog part behind the DAC (analog side).
For our convenience I try to model it in Multisim. Seems to be standard design following data sheets.

I will use my board with the DIP OPs since they are easier to lift for testing because I want to avoid any kind of damage to the OPs.
But plz don't expect a finalized schematics this week. It will take time due to real life impact.

There is absolutely no hurry, I'll try the rest of the digital and connector part and maybe power it on in the WE.

 Cheers,
 DC1MC
 

Online Qw3rtzuiop

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Thanks for the hints and the research.

Here are some of my almost empty eproms.
 
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Offline DC1MC

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Thanks for the hints and the research.

Here are some of my almost empty eproms.

Thanks for your contribution, if the 2KB memory is used as a PAL to do some selections, the comparisons of them will be telling us about what they're doing. Soon I'll statz deeply in the digital part, there is some combinatorics logic that I want to decode, because the signal to strobe the BCD inputs in the latches is generated there.

 Cheers,
 DC1MC
 

Offline Bad_Driver

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

For easier contribution to the connector layout the table of DC1MC as EXCEL.
« Last Edit: April 21, 2021, 08:17:56 am by Bad_Driver »
 

Offline McBryce

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

That's the number on both of mine.

McBryce.
 

Offline DC1MC

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

For easier contribution to the connector layout the table of DC1MC as EXCEL.

Mine are the same revision as well  :-+ !!!
 

Offline FransW

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And so ar mine.
Frans
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline DC1MC

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Guess what just arrived in  ^-^
 

Offline DC1MC

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To complement the BCD switches, I've got this:

https://www.ebay.de/itm/164595954992

and this:

https://www.ebay.de/itm/164175322203

I already have the green perfboard where I'll solder the connector and some machined pin bars to make a little socket for the switches.

This WE I was conscripted by the SWMBO for garden work :(, but I intend to finish the digital part next week, any news on the analog part ?

 Cheers,
 DC1MC
 

Offline Bad_Driver

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My EPROM reader arrived earlier than expected. Attached the both files, no suprises.
A lonely "20H" and one line of code.

Unfortunately my family wants the reactivation of my 3D printer but after standing in the corner for 2 years it needs a lot of efforts.... :phew:
I'm in the "change every single part" mode ....  |O Maybe I should check the PSU now since all dry runs work but not real printing.

So the ref boards have to wait on my bench a little bit longer.

 

Offline FransW

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[attachimg=2]Annotated ref board.
Vectored image.
updated
« Last Edit: April 29, 2021, 03:15:36 pm by FransW »
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline FransW

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Any working example or prototype?
Unipolar or bi-polar?
BCD switches seem logical as does the ERNI connector replacement, however
the latter not strictly necessary.

All V-supply pin rows are inter-connected which leaves only one in actual use.
Is your plan to connect the memory directly to the BCD switches or via the ERNI
connector?
Or the use of a breakout assembly?

Frans
« Last Edit: May 04, 2021, 12:10:38 pm by FransW »
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Offline DC1MC

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Some unexpected health problems popped up, so for the moment here is a picture with the (unfinished) BCD connectors, one of the resistor networks that I've mentioned in a previous post and a Kikad project where I've traced the minimum to load the latches with the BCD values (the signal is LE).

 Cheers,
 DC1MC
 

Offline FransW

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Updated Board picture.
Frans

Edit: added picture
Note: female breadboard wires are a perfect fit on the 90 degr add-on connector.
They fit nicely next to each other, rows & columns.
« Last Edit: May 07, 2021, 11:45:54 am by FransW »
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Offline FransW

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Abandoned by TS?

Misjudged purpose & means?
« Last Edit: June 05, 2021, 09:25:49 am by FransW »
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 


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