goldenreference low voltage power supply

[audiostar]

On 7/15/2022 at 7:41 AM, mrjayviper said:

the latest gerber file seems to be goldenreferencelargecap.zip. but the AC input part seems to be very different from version 6.

seems the goldenreferencelargecap, AC input uses only 1 transformer secondary? Thanks

Answers are in the thread, why not read everything first? 

[migo]

Sorry, wrong thread. But this has build in two 30V GRLVs.

[audiostar]

10 minutes ago, migo said:

Sorry, wrong thread. But this has build in two 30V GRLVs.

Congratulation, very nicely done, time to enjoy some music 👍

[migo]

On 7/25/2022 at 7:02 PM, audiostar said:

Congratulation, very nicely done, time to enjoy some music 👍

Thank you very much!

[dip16amp]

Here is my grlv power supply built on dip 16 sockets for my dynalo amp, also built on dip 16 sockets and put in an Altoids tin.
It outputs +/- 16.7 volts using a couple of 16 vac 30 va transformers which puts 23 vdc into the grlv module.
Also built a +/- 30 volt supply with a couple of 25.2 vac 50.4 va transformers and it puts 37 vdc into the grlv module.
A second +/- 30 volt supply is pictured open. These are for my balanced dynahi, also built on dip 16 sockets.
The grlv dip 16 module has 5 sockets on each side. There are 18 wires connecting 71 pins, each pin has only one wire on it, 9 pins are not used on the ICs.
Parts layout and wirelist make it easy to reproduce.

 

[chinsettawong]

That's such a neat idea.  Can you show us the bottom side how you hard wired them together?

[dip16amp]

On 8/24/2022 at 8:02 PM, chinsettawong said:

That's such a neat idea.  Can you show us the bottom side how you hard wired them together?

The first has the first 12 wires and the second has all 18 wires. Attached is the layout and wire lists. That is 2" duct tape holding the sockets together for soldering. The wire is from solid 24 awg cat 5 wire.

I could not find any opa134pa op amps so I used tl081bcp, also tried lm318p which also works.

The 47 uF caps has the 9.1 zener voltage and 10 volt ref voltage so I used 16 volt caps

Used zener diode 9.1v 1/2w 78-BZX55B9V1 to fit into the sockets.

grlv dip 16 layout.zip

[dip16amp]

On 8/24/2022 at 10:01 PM, dip16amp said:

The first has the first 12 wires and the second has all 18 wires. Attached is the layout and wire lists. That is 2" duct tape holding the sockets together for soldering. The wire is from solid 24 awg cat 5 wire.

I could not find any opa134pa op amps so I used tl081bcp, also tried lm318p which also works.

The 47 uF caps has the 9.1 zener voltage and 10 volt ref voltage so I used 16 volt caps

Used zener diode 9.1v 1/2w 78-BZX55B9V1 to fit into the sockets.

grlv dip 16 layout.zip 1.12 kB · 0 downloads

copy the following text into notepad for proper spacing format

grlv dip 16 layout

+30 volt
----A---------B----
|   R16  |   R1   |
|D9+  D1+|Q6E  Q3E|
|D9-  D1-|Q6B  Q3B|
|Q14C Q1E|Q6C  Q3C|
|Q14B Q1B|   R3   |
|Q14E Q1C| + D4 - |
|   R2   | - C7 + |
|   R19  |  C11   |
-------------------
----C--------D-----
|1      8|Q8D  Q9B|Q4B
|   U1   |Q8G  Q9C|Q4C D11-
|        |Q8S  Q9E|Q4E D11+
|4      5|  R11   |
|1      8|  R20   |
|   D6   |  C .01 |
|        |  + D - |
|4      5|  - D + |
--------------------
--------------------------------
|C5 C9- C12 C16- R8 R7 C6+ C4.7|
E                              |
|C5 C9+ C12 C16+ R8 R7 C6- C4.7|
--------------------------------

-30 volt
        ----G---------F-----
        |   R4    |   R15  |
        |Q10E Q11E|D2-  D8-|
        |Q10B Q11B|D2+  D8+|
        |Q10C Q11C|Q2E Q13C|
        |   R6    |Q2B Q13B|
        | + D6 -  |Q2C Q13E|
        | - C13 + |   R5   |
        |   C14   |   R22  |
        --------------------
        ----I---------H-----
     Q7B|Q5B  Q12D|1      8|
D10+ Q7C|Q5C  Q12G|   U2   |
D10- Q7E|Q5E  Q12S|        |
        |  R12    |4      5|
        |  R21    |1      8|
        |  C .01  |   D7   |
        |  - D +  |        |
        |  + D -  |4      5|
        ---------------------------------
        |C4.7 C10+ R10 R9 C3+ C15 C8+ C4|
        J                               |
        |C4.7 C10- R10 R9 C3- C15 C8- C4|
        ---------------------------------

wirelist +30 volt 24 AWG solid wire
1. A6 A7
2. A14 A13
3. B16 B15
4. B2 B12
5. B3 A9
6. D3 D13
7. A1 A2 A5
8. A8 C14 E16
9. B5 B6 B7 B8
10. A4 A11 A12 A14
11. D2 D4 D5 C10
12. B13 B11 B10 B9 D16
13. E1 D7 D8 E11 E12 E13 C2
14. C3 D12 D10 D9 E3 E2
15. (C2-) A3 B4 A10 C4 C8 D11 E8 E7 E6 E14 E15
16. (C2+) A16 A15 B1 D15 (Q4C) (D11-)
17. E5 E4 E10 E9 D6 D1 C15 (Q4E) (D11+)
18. D14 (Q4B)
stranded 20 AWG wire
(Q4C) (C2+) red
(Q4E) output terminal pos red
(C2-) output terminal gnd grn

wirelist -30 volt 24 AWG solid wire
1. F10 F11
2. F3 F4
3. G1 G2
4. G5 G15
5. I4 I14
6. G14 F8
7. F16 F15 F12
8. F13 F5 F6 G3
9. G9 G10 G11 G12
10. G4 G6 G7 G8 I1
11. F9 H14 J9
12. I16 I12 H8
13. H3 I5 I7 I8 J6 J7
14. H2 I10 I9 J14 J13 J12 J8
15. (C1+) F14 G13 F7 H15 H10 J11 J10 J3 J15 J16 I6
16. (C1-) F1 F2 G16 I2 (Q7C) (D10+)
17. J1 J2 J4 J5 I11 I13 H4 I15 (Q7E) (D10-)
18. I3 (Q7B)
stranded 20 AWG wire
(C1-) (Q7C) blk
(Q7E) output terminal neg blk
(C1+) output terminal gnd grn

copy the above text into notepad for proper spacing format

[audiostar]

On 4/22/2018 at 12:59 AM, Kerry said:

Here's the accompanying board for the GR HV & LV supplies.

It's got a built-in controller to turn the HV on after a delay (if needed) along with a power LED indicator (flashing to solid).

Hi Kerry, which connectors are you using here for the LV, HV and the output voltages? Look like 4mm pitch. Tried Mate-N-Lok but not really sure as they do not have the fixating hole on the short side like these. Thanks @Kerry

Edited September 12, 2022 by audiostar

[Kerry]

Here's the part numbers for the 2x8 connectors:

1-794065-0
770579-1
770988-1

The 2 and three pin connectors are the same series.

[audiostar]

Thanks, Kerry. Tried to locate the others:

Edited September 12, 2022 by audiostar

[audiostar]

Kerry, could you please recommend a replacement for the 511K resistor CRCW2512511KFKEG (from the BOM). I was looking into it but couldn‘t find anything near or suitable and Mouser gives me a delivery date for it in March 2024, which is radiculous at best. Thanks @Kerry

Edited September 16, 2022 by audiostar

[Pars]

There are some 1W 510K 2512 case thick films here:

[audiostar]

Thanks, Pars. Those are all 200V and the CRCW2512511KFKEG is 500V. No idea atm if that matters where it is used.

[jamesmking]

1 hour ago, audiostar said:

Thanks, Pars. Those are all 200V and the CRCW2512511KFKEG is 500V. No idea atm if that matters where it is used.

I don't have a layout or schematic for the golden reference HV SMD but if it is similar to the through hole. The only places resistors with 250K+ resistance are used is in 

1. bleed resistors for the high voltage smoothing caps - and so subject to high dc voltage. My best guess would be they are using a single resistor for the bleed unlike the through hole which uses two 250K 1/2W. So a single 1W 500V 510K would be about right here

2. output sense resistors - and so subject to high dc voltage 

3. in the 580V bias circuit and so again subject to high dc voltage 

But this is only a guess based on looking at the through hole schematic... I have never built a golden reference hv SMD version. 

 

Edited September 16, 2022 by jamesmking

[audiostar]

Thanks, James. Need to check the PCBs later on - the CRCW2512511KFKEG is used for R28, R29 in the base board.

[jamesmking]

44 minutes ago, audiostar said:

Thanks, James. Need to check the PCBs later on - the CRCW2512511KFKEG is used for R28, R29 in the base board.

Thanks for the photos

R30 and R31 are in series and look to be the bleed resistors for the high voltage input smoothing cap so the voltage is shared between R30 and R31 but the input cap has the highest voltage across it. 200V working voltage is probably not enough here since the input is probably rectified to more than 400VDC

R28 is the single bleed resistor for the output cap and so has the entire output dc voltage across it. So unless your psu is only outputting 200V or less, then a 200V working voltage resistor will definitely not be enough by a large margin. 

Since its a bleed resistor the exact value is not critical, a higher value would simply mean the high voltage would bleed to 0V at a bit slower speed and a bit lower value would very slightly increase power consumption when the power supply is on...

 

Edited September 16, 2022 by jamesmking

[audiostar]

Exactly, the PSU is outputting 400-450V and R28, R29 are single resistors. 

Edited September 16, 2022 by audiostar

[jamesmking]

23 minutes ago, audiostar said:

Exactly, the PSU is outputting 400-450V and R28, R29 are single resistors. 

CRCW2512475KFKEG which is same series as the original and so is 500V 1W and 475K should be fine in this application and is in stock at mouser....

lets say the resistor has the full 500V across it - which is worst possible case,

V/R = I

so the current through the bleed resistor would be 500/475000 = 0.00105A

power dissipation in the bleed resistor would be W = I * V = 0.00105 * 500 = 0.53W and so well within the 1W capacity of the resistor...

if the resistor has less than the full 500V across it the power dissipation will be less...

Edited September 16, 2022 by jamesmking

[Kerry]

R28 and R29 are the bleed resistors for the DC output (typically 400V or 450V).  R30/31 & R32/33 are for the DC input and are in series since the voltages they see will likely be above 500V. 

In general, the capacitor bleed resistors are set to around .4W to .45W or thereabout - independent of whether they are in series or not. 

They can be a bit more or less.  I usually like less.  Any values that get you close are fine.  Just make sure they are still 500V each and at least 1W.  

This chip storage is mentally fatiguing... or... a great way to hone your skills.  Pick one 

[audiostar]

On 9/12/2022 at 4:58 PM, Kerry said:

Here's the part numbers for the 2x8 connectors:

1-794065-0
770579-1
770988-1

Got them and soldered. Those are just phenomenal connectors, solidly held in place by a knob to the board so no moving at all, very solid, HV with enough space between pins, completely isolated pins (doubled by the inserted plugs), keyed, no screws to fiddle with, etc. Just rock solid and my favourite so far.

Edited September 18, 2022 by audiostar

[Kerry]

I’ve been using that series for a bunch of years now and I’ve been very happy. 

[mrjayviper]

On 7/19/2022 at 6:25 AM, audiostar said:

Answers are in the thread, why not read everything first? 

I am trying to avoid reading a novel if the answer can be easily/readily given

[Pars]

On 7/15/2022 at 12:41 AM, mrjayviper said:

the latest gerber file seems to be goldenreferencelargecap.zip. but the AC input part seems to be very different from version 6.

seems the goldenreferencelargecap, AC input uses only 1 transformer secondary? Thanks

 

9 hours ago, mrjayviper said:

I am trying to avoid reading a novel if the answer can be easily/readily given

In general, we prefer to avoid spoon feeding newer members and encourage them to do their own research. At some point, Kevin added a 3rd bridge and the capability to use a single bridge with a CT transformer (like amb's sigma22). Obviously you don't use all 3 bridges at once.

If you look at the popular post feature on the right side, above, you'll see some of the key posts in this thread. I'm not sure, but jamesmking may have done a version history of the GRLV at some point. I know he did for the GRHV. His July 27, 2021 post shown in the Popular Posts might be a good one to look at. Using the search bar and searching "largecap" will find some info, including a recommendation for what board version to use...

[mrjayviper]

Thanks for the tip @Pars

I didn't know about that forum feature.