High Precision 10 V Reference - Analog Devices AD587KN + AD7535JN + 5x OP07CJ - Page 1
Forum section: electronics / general

author: DC1MC
author_rank: Super Contributor
timestamp: April 14, 2021, 07:36:38 pm
content: This topic pertains to the $subject, low cost (10EUR) cards that were avalable from the ebay seller smokeli.https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP177/154410695222[url=https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP07CJ/154410692288]https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP07CJ/154410692288He also has on his alternate account, the matching connectors:https://www.ebay.de/itm/96pol-Federleiste-Buchsenleiste-90-gewinkelt-3-reihig-female-ERNI-004516/124355155637There are a number of variants, some of them had AD587KN, others AD587JN, personally have 2 with AD587KN.The most important components are socketed and can be harvested "as-is", but the idea is to reverse the board and see if we can use it in the current configuration.So enjoy the top/bottom pictures and the firstbloodpower of a board.Cheers,DC1MC

author: DC1MC
author_rank: Super Contributor
timestamp: April 14, 2021, 08:01:12 pm
content: Intial examination:The logic on the board is fully combinational, no pesky clocks or other noise inducing signals.The value of the 16bit BCD inputs are latched via IC2 and IC3 (74HC573A Octal TransparentD-TypeLatchesWith 3-State Outputs) and displayed on the front 4 digit 7-segment display, via the decoder ICs 7-9 (HEF4511BT BCD to 7-segment latch decoder drivers).Also the input values are entered in a BCD to binary converter EPROM IC14 (M27C1024 64KBx16 UV EPROM), the outputs go into IC15 (AD7535JN 14bit DAC with parallel inputs ) that uses as reference IC16 (AD587KJ or JN 10volts precision reference).On the board are a large number of precision OP, either OP07 or OP177, some relays and a mystery EPROM, IC1 (M27C128 16KBx8).On the front panel there are two 2 positions, non-retaining switch ( Ein - 0 - Ext ein) and (Aus - 0 - Setz), most likely switching the reference with some external one.Recommended BCD switches:https://www.ebay.de/itm/Kodierschalter-0-9-BCD-Codierschalter-Vorwahlschalter-Pushweelswitch-1-Stuck/312231336643So much for now, lots of things TODO.

author: DC1MC
author_rank: Super Contributor
timestamp: April 14, 2021, 08:09:57 pm
content: Power (before pinout):+5V - Over C2 (Tested OK)-15V - Over C4 (Not-tested!!!, polarity OK, actual value TBD).+15V - Over C6 (Not-tested !!!, polarity OK, actual value TBD).Fun (?!?) fact: in my board the line on the capacitor body signifies (-) but fortunately the correct polarity is printed on the PCB silk mask.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 15, 2021, 06:22:21 am
content: The same BCD switches from Aliexpress, just ordered!Still awaiting the boards ....

author: McBryce
author_rank: Super Contributor
timestamp: April 15, 2021, 07:49:44 am
content: Hi,I have two of the boards and I've dumped the EPROMs. The BCDBIN (27C1024) has identical contents on both boards (as expected) and contain a lookup table. The mystery EPROM (27C128) is different on both boards. They are essentially blank (filled with &00 not &FF) except for a few bytes which are possibly some sort of addressing for the card? Binary files below.McBryce.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 15, 2021, 02:43:36 pm
content: Interesting! Only 2 Bits difference. Let's see what the other board owners report.btw: what are you using for the EPROM read-out? I do not have anything for this but it's never to late.

author: McBryce
author_rank: Super Contributor
timestamp: April 15, 2021, 06:12:29 pm
content: My recommendation depends on how often you would use it. I have a Batronix BX48. It's bullet-proof and can program almost anything you throw at it, but it's relatively expensive. However, I use it almost daily as my main interest is vintage computer repair / restoration. For casual use there are much cheaper solutions, such as the TL-866 which I would also highly recommend.McBryce.https://www.batronix.com/versand/programmiergeraete/BX48/batego-II.htmlhttps://www.ebay.de/itm/TL866A-Great-Speed-in-circuit-Programmer-USB-EPROM-EEPROM-FLASH-BIOS-AVR-AL-PIC/402699959557

author: DC1MC
author_rank: Super Contributor
timestamp: April 15, 2021, 11:17:05 pm
content: Thanks everybody for your contribution, now the bit two tasks are waiting- Connector pinout !!!- Analog part schematic, what are all the OP doing ?If something's left in WE, I'll try the pinout, at least to start it.Cheers,DC1MC

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 16, 2021, 06:41:38 am
content: It's 40 years ago when I built my last EPROM programmer for a Z80 based OEM system (U880 in East Germany) and wrote the assembler code.I think the 2nd one is enough for my needs. Thanks for the link! I ordered one but it takes time on the slow boat from chinaFirst idea was that the code line is a serial number of the board but than I saw that the datas are at different addresses in both EPROMs.Hope my boards arrive today but DHL is like the weather, the forecast is never correct.

author: McBryce
author_rank: Super Contributor
timestamp: April 16, 2021, 07:42:56 am
content: Quote from: DC1MC on April 15, 2021, 11:17:05 pmI have already started on some of the pinout, but I still need to find out how the connector pins are normally numbered. There's no pin numbers on the physical connectors I have.McBryce.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 16, 2021, 08:08:57 am
content: May be the following link helps with the connector.https://www.erni.com/fileadmin/user_upload/Downloads/Products/DIN_41612/ERNI-DIN41612-IEC60603-2-d.pdf

author: McBryce
author_rank: Super Contributor
timestamp: April 16, 2021, 08:54:15 am
content: I found the shorter version just for that connector. I'll use the numbering they supply here (1 to 32 with rows ABC).McBryce.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 17, 2021, 12:45:16 pm
content: DHL is better than expected. My boards arrived.Attached first shots for your entertainment.Seems to be a multilayer PCB with ground and power supply in the middle?

author: DC1MC
author_rank: Super Contributor
timestamp: April 17, 2021, 01:46:57 pm
content: Quote from: Bad_Driver on April 17, 2021, 12:45:16 pmWelcome to the (very exclusive) club!!!Let's make the roll call, who has the boards and read the topic still ?Cheers,DC1MC

author: McBryce
author_rank: Super Contributor
timestamp: April 17, 2021, 02:42:56 pm
content: Quote from: DC1MC on April 17, 2021, 01:46:57 pmMe, but I didn't have enough time to look at the boards any further yet.McBryce.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 17, 2021, 05:10:11 pm
content: Sorry it takes some time to start. Real life implications during f@%&ing shutdown with 3 kids at homeand full time job give me only short interrupts for my bench.(nach dreizehn Monaten zweifelt man immer mehr an der Fähigkeit unserer geilen Regierung)Has someone ask the seller where the boards come from?

author: artag
author_rank: Super Contributor
timestamp: April 17, 2021, 06:18:40 pm
content: Unfortunately, he doesn't ship to UK

author: FransW
author_rank: Frequent Contributor
timestamp: April 18, 2021, 09:25:51 am
content: Waiting for my boards & connectors.

author: tggzzz
author_rank: Super Contributor
timestamp: April 18, 2021, 10:13:27 am
content: Quote from: artag on April 17, 2021, 06:18:40 pmFortunately, in my case - since I have some standards and don'tneedanother

author: McBryce
author_rank: Super Contributor
timestamp: April 18, 2021, 11:01:31 am
content: For those who are asanalOCD as I am, I made this sheet to help on pinout reverse engineering. The connector picture is of the mating connector, not the connector on the populated PCB.McBryce.

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 18, 2021, 11:15:03 am
content: It seems that all boards are sold. That‘s good because I couldn't suppress my wish to buy more boards.

author: McBryce
author_rank: Super Contributor
timestamp: April 18, 2021, 11:55:01 am
content: Not going to have much more time today, so here is my Pinout info for today.McBryce.

author: DC1MC
author_rank: Super Contributor
timestamp: April 18, 2021, 12:08:22 pm
content: Quote from: McBryce on April 18, 2021, 11:55:01 amLets add something extra, maybe next time we can have some common editable format, let's kill all the low hanging fruits:A B C01 xxxxxxx xxxxxxx xxxxxxx02 xxxxxxx xxxxxxx xxxxxxx03 xxxxxxx xxxxxxx xxxxxxx04 xxxxxxx xxxxxxx xxxxxxx05 xxxxxxx xxxxxxx xxxxxxx06 xxxxxxx xxxxxxx xxxxxxx07 xxxxxxx xxxxxxx xxxxxxx08 xxxxxxx xxxxxxx xxxxxxx09 xxxxxxx xxxxxxx xxxxxxx10 xxxxxxx xxxxxxx xxxxxxx11 -15V -15V -15V12 -15VX -15Vx -15Vx (IC20 - OP07)13 +15V +15V +15V14 +15VX +15Vx +15Vx (IC20 - OP07)15 GND GND GND16 GND GND GND17 +5V +5V +5V18 +5V +5V +5V19 xxxxxxx xxxxxxx xxxxxxx20 xxxxxxx xxxxxxx xxxxxxx21 xxxxxxx xxxxxxx xxxxxxx22 xxxxxxx xxxxxxx xxxxxxx23 xxxxxxx xxxxxxx xxxxxxx24 xxxxxxx xxxxxxx xxxxxxx25 xxxxxxx xxxxxxx xxxxxxx26 xxxxxxx xxxxxxx xxxxxxx27 xxxxxxx xxxxxxx xxxxxxx28 xxxxxxx xxxxxxx xxxxxxx29 xxxxxxx xxxxxxx xxxxxxx20 xxxxxxx xxxxxxx xxxxxxx31 xxxxxxx xxxxxxx xxxxxxx32 xxxxxxx xxxxxxx xxxxxxx

author: DC1MC
author_rank: Super Contributor
timestamp: April 18, 2021, 12:28:20 pm
content: Quote from: Bad_Driver on April 18, 2021, 11:15:03 amThere are just a few connectors left, if you need them now is the time to get them.

author: McBryce
author_rank: Super Contributor
timestamp: April 18, 2021, 01:01:21 pm
content: Ok, here's the editable version with all I have so far (plus your notes too).I wouldn't be too worried about the availability of the connector, they are relatively easy to find:ERNI -https://www.ebay.de/itm/96pol-Federleiste-Buchsenleiste-90-gewinkelt-3-reihig-female-ERNI-004516-/124355155637Amphenol -https://www.ebay.de/itm/4x-Amphenol-Federleiste-Buchse-96-polig-90-C143-012B-96S-NOS/324247782999McBryce.

author: DC1MC
author_rank: Super Contributor
timestamp: April 18, 2021, 01:34:01 pm
content: Here's my update version and some notes at the end:A B C01 A2K_00 A2K_01 A2K_0202 A2K_03 A2K_04 A2K_0503 A2K_06 A2K_07 A2K_0804 A2K_09 A2K_10 BCD_0005 BCD_01 BCD_02 BCD_0306 BCD_10 BCD_11 BCD_1207 BCD_13 BCD_20 BCD_2108 BCD_22 BCD_23 BCD_3009 BCD_31 BCD_32 BCD_3310 A2K_11 xxxxxxx xxxxxxx11 -15V -15V -15V12 -15VX -15Vx -15Vx (IC20 - OP07)13 +15V +15V +15V14 +15VX +15Vx +15Vx (IC20 - OP07)15 GND GND GND16 GND GND GND17 +5V +5V +5V18 +5V +5V +5V19 xxxxxxx xxxxxxx xxxxxxx20 xxxxxxx xxxxxxx xxxxxxx21 xxxxxxx xxxxxxx xxxxxxx22 xxxxxxx xxxxxxx xxxxxxx23 xxxxxxx xxxxxxx xxxxxxx24 xxxxxxx xxxxxxx xxxxxxx25 xxxxxxx xxxxxxx xxxxxxx26 xxxxxxx xxxxxxx xxxxxxx27 xxxxxxx xxxxxxx xxxxxxx28 xxxxxxx xxxxxxx xxxxxxx29 xxxxxxx xxxxxxx xxxxxxx20 xxxxxxx xxxxxxx xxxxxxx31 xxxxxxx xxxxxxx xxxxxxx32 GND_12V GND_12V GND_12VNOTES:- 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

author: FransW
author_rank: Frequent Contributor
timestamp: April 18, 2021, 11:16:09 pm
content: 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

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 19, 2021, 02:15:10 pm
content: 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.

author: DC1MC
author_rank: Super Contributor
timestamp: April 19, 2021, 05:01:01 pm
content: Quote from: Bad_Driver on April 19, 2021, 02:15:10 pmThere 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

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: April 20, 2021, 04:21:35 pm
content: Thanks for the hints and the research.Here are some of my almost empty eproms.

author: DC1MC
author_rank: Super Contributor
timestamp: April 20, 2021, 05:36:28 pm
content: Quote from: Qw3rtzuiop on April 20, 2021, 04:21:35 pmThanks 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

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 21, 2021, 07:50:46 am
content: 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.

author: McBryce
author_rank: Super Contributor
timestamp: April 21, 2021, 07:52:08 am
content: Quote from: Bad_Driver on April 21, 2021, 07:50:46 amThat's the number on both of mine.McBryce.

author: DC1MC
author_rank: Super Contributor
timestamp: April 21, 2021, 03:00:30 pm
content: Quote from: Bad_Driver on April 21, 2021, 07:50:46 amMine are the same revision as well!!!

author: FransW
author_rank: Frequent Contributor
timestamp: April 23, 2021, 03:11:22 pm
content: And so ar mine.Frans

author: DC1MC
author_rank: Super Contributor
timestamp: April 25, 2021, 09:09:27 am
content: Guess what just arrived in

author: DC1MC
author_rank: Super Contributor
timestamp: April 25, 2021, 07:16:30 pm
content: To complement the BCD switches, I've got this:https://www.ebay.de/itm/164595954992and this:https://www.ebay.de/itm/164175322203I 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

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: April 28, 2021, 06:37:25 am
content: 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....I'm in the "change every single part" mode ....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.

author: FransW
author_rank: Frequent Contributor
timestamp: April 29, 2021, 12:17:17 pm
content: [ Specified attachment is not available ]Annotated ref board.Vectored image.updated

author: FransW
author_rank: Frequent Contributor
timestamp: May 04, 2021, 12:07:38 pm
content: Any working example or prototype?Unipolar or bi-polar?BCD switches seem logical as does the ERNI connector replacement, howeverthe 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 ERNIconnector?Or the use of a breakout assembly?Frans

author: DC1MC
author_rank: Super Contributor
timestamp: May 04, 2021, 03:26:06 pm
content: 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

author: FransW
author_rank: Frequent Contributor
timestamp: May 07, 2021, 11:36:20 am
content: Updated Board picture.FransEdit: added pictureNote: female breadboard wires are a perfect fit on the 90 degr add-on connector.They fit nicely next to each other, rows & columns.

author: FransW
author_rank: Frequent Contributor
timestamp: May 29, 2021, 11:13:01 am
content: Abandoned by TS?Misjudged purpose & means?

author: Bad_Driver
author_rank: Frequent Contributor
timestamp: August 18, 2021, 09:56:21 am
content: Sorry friends, was away for a while because job & family and some other things from real life killed a lot of bench timeI started again with the analog part outgoing from the Vref-IC. Little bit strange, Vref-out goes to a relays and via the connector outside or backward to OP18.One question: it seems that the connector counting of DC1MC is wrong?Looking from the board onto the connector (left hand - as in the provided photos) I see the marking and than p.a. DGND is in row 18 and Vdig(5V) in row 15/16.

author: FransW
author_rank: Frequent Contributor
timestamp: August 29, 2021, 08:48:23 am
content: I was wondering whether this topic would come alive again.My impression was that the topic starter left this subject become an orphan.So DC1MC, what about it?Frans