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Technics SL-1200 DC Power Supply
Technics SL-1200 DC Power Supply
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Old 10th September 2020, 10:47 PM   #291
more10 is offline more10  Sweden
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Tonight I successfully connected an external SMPS with PFC. There is no hum or noise from the Technics.

I believe I will build an external power supply. I dont trust the RS-15-24 any more.

There was a static discharge when I touched the Technics. This should be handled by proper grounding. Should I ground through the power supply or through the riaa?

Mårten

Last edited by more10; 10th September 2020 at 10:57 PM.
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Old 14th November 2020, 05:13 AM   #292
peppennino is online now peppennino  Italy
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Technics SL-1200 DC Power Supply
So, here we are 😄 First of all, many thanks to 6L6 for the tutorial 👍
I started obviously by removing the internal PSU.
I found a cheap PCB for double pi filter and I used 4x22 ohm 5W ceramic resistors. Quasimodo snubber (European tranny) is placed under the board and 3x3300uF caps used in crcrc.
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Old 14th November 2020, 05:27 AM   #293
peppennino is online now peppennino  Italy
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Some pics...
I used the original on/off switch for strobe.
Attached Images
File Type: jpg PSX_20201114_072027.jpg (200.4 KB, 217 views)
File Type: jpg PSX_20201114_072046.jpg (168.5 KB, 202 views)
File Type: jpg PSX_20201114_072118.jpg (220.6 KB, 192 views)
File Type: jpg PSX_20201114_072142.jpg (162.2 KB, 191 views)
File Type: jpg PSX_20201114_072227.jpg (170.8 KB, 180 views)
File Type: jpg PSX_20201114_072301.jpg (180.3 KB, 67 views)
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Old 14th November 2020, 05:35 AM   #294
peppennino is online now peppennino  Italy
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Removed bridge and snubber caps, placed new umbilical and soldered switch wires to strobe.
Attached Images
File Type: jpg PSX_20201114_072920.jpg (923.1 KB, 73 views)
File Type: jpg PSX_20201114_072944.jpg (193.1 KB, 62 views)
File Type: jpg PSX_20201114_073006.jpg (197.4 KB, 60 views)
File Type: jpg PSX_20201114_073025.jpg (164.4 KB, 48 views)
File Type: jpg PSX_20201114_073044.jpg (964.7 KB, 47 views)
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Old 14th November 2020, 05:40 AM   #295
peppennino is online now peppennino  Italy
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New cable holder on original bracket and Mike 2 pin connector for the umbilical. Now waiting for a Galaxy 2 units cabinet 😃🖖
Attached Images
File Type: jpg PSX_20201114_073109.jpg (205.2 KB, 56 views)
File Type: jpg PSX_20201114_073126.jpg (162.7 KB, 52 views)
File Type: jpg PSX_20201114_073150.jpg (155.6 KB, 48 views)
File Type: jpg PSX_20201114_073209.jpg (135.1 KB, 44 views)
File Type: jpg PSX_20201114_073230.jpg (175.7 KB, 58 views)
File Type: jpg PSX_20201114_073256.jpg (118.5 KB, 59 views)
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Last edited by peppennino; 14th November 2020 at 06:08 AM.
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Old 14th November 2020, 05:44 AM   #296
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Ps. Yes, I know, blue wire is connected to +, normally it is used for neutral... too late 😆
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Old 14th November 2020, 07:02 AM   #297
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Original "E" transformer connected for 230V and the pcb
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File Type: jpg PSX_20201114_090030.jpg (128.1 KB, 88 views)
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Old 19th November 2020, 03:28 PM   #298
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Almost completed. It works fine!
Thanks to all!
Attached Images
File Type: jpg PSX_20201119_172406.jpg (212.8 KB, 83 views)
File Type: jpg PSX_20201119_172509.jpg (211.2 KB, 70 views)
File Type: jpg PSX_20201119_172439.jpg (190.1 KB, 43 views)
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Old 19th November 2020, 03:59 PM   #299
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Yes!
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Old 19th November 2020, 05:50 PM   #300
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Just a question: as I used a metal cabinet, does I have to connect it to the ground? And in that case, how can I avoid the risk of ground loop with the earth? Thanks in advance
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