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Rabco SL8E Photoelectric Servo Control Retrofit
Rabco SL8E Photoelectric Servo Control Retrofit
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Old 22nd October 2020, 02:24 PM   #21
nero52 is offline nero52
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Join Date: Apr 2020
Hi diyrayk
I have just modified my very old Rabco SL8 with your help on this site. Everything works fine with the optical reading, it's absolutely great!
Thank you very much for posting this step by step manual.
I even spent a green led for transportmotor, so i can see when he's in action.
Greetings from Switzerland, nero52
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Old 22nd October 2020, 02:31 PM   #22
nero52 is offline nero52
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Join Date: Apr 2020
Default Modified Rabco SL8

Two images, work is done!
Attached Images
File Type: jpg Rabco.jpg (54.5 KB, 109 views)
File Type: jpg Rabco_Led.jpg (39.7 KB, 111 views)
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Old 26th October 2020, 08:48 PM   #23
diyrayk is offline diyrayk  United States
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Glad to see another happy user of this mod. Do you have any more photos of your construction details? I like to think that the green led indicator was necessary because the motor was now running too quiet to hear, or is that vanity on my part?

Ray K
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Old 26th October 2020, 09:32 PM   #24
nero52 is offline nero52
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Join Date: Apr 2020
Hi diyrayk
there are only two more photos. The green led indicator is just for my fun, to see that the motor is working. i have never heard the motor, but i spent hours in front of my rabco - hoping it works.

i couldn't adjust the two contactwires anymore and instead of them i took two small pieces of guitar strings. that worked for two month...
now i'm very happy after the photosensor upgrade, but i spent some hours to make it. every minute is worth it!!!
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File Type: jpg 20201021_144238.jpg (566.6 KB, 80 views)
File Type: jpg 20201021_220205.jpg (661.5 KB, 74 views)
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Old 2nd December 2020, 04:02 PM   #25
Rajkumar_ is offline Rajkumar_  India
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Hi Ray thank you for your great posting, I had modified my Rabco SL8E working very good. Motor run very quietly, visually not possible see the carriage moment. I am very happy, this arm will work another 50 years trouble free. I would like add led for carriage motor moment like Nero52. I had try to add led before R1 resistor (Q1 collector), working but I feel motor get too slow! Pls advice where I can connect led. Tks Rajkumar
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Last edited by Rajkumar_; 2nd December 2020 at 04:05 PM.
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Old 2nd December 2020, 05:10 PM   #26
nero52 is offline nero52
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Hi Rajkumar_
i put it parallel to the motor, switched by a transistor. rabco_led.jpg
see schematic
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Old 2nd December 2020, 08:54 PM   #27
nero52 is offline nero52
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Rajkumar_
i took the 5V (Power Supply) direct from my Thorens TD 125 with a step down Module. Make sure, that the Voltage is correct after modifying with the Led, otherwise the transportmotor is too slow.
I mounted all the electronic parts onto a little print and put it inside the battery housing.
Best regards
Richi, nero52
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File Type: jpg RABCOLED.jpg (75.2 KB, 46 views)
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Old 3rd December 2020, 02:11 AM   #28
Rajkumar_ is offline Rajkumar_  India
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Hi nero52, thanks for your answer, so I need 1k & 4.7k what is number of transistor T1. Rajkumar
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DIY Horn, Rethm Saadhana V2, Gaanam Amp, Dared 845 KR Tubes, Dared 300B, Dared DL2000, CEC TL1 CD Transport, Meridian G08, Bryston BDP-1, DAC Antelope Zadiac Gold, Cable Kimber Monocle XL, AQ SKY, Norduct. Analog: Kenwood L-07D, R2R Pioneer RT-909
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Old 3rd December 2020, 03:50 AM   #29
Rajkumar_ is offline Rajkumar_  India
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I plan to use BC546, 547, 550 or 2N3904/2N222a which one available in market. Tks
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DIY Horn, Rethm Saadhana V2, Gaanam Amp, Dared 845 KR Tubes, Dared 300B, Dared DL2000, CEC TL1 CD Transport, Meridian G08, Bryston BDP-1, DAC Antelope Zadiac Gold, Cable Kimber Monocle XL, AQ SKY, Norduct. Analog: Kenwood L-07D, R2R Pioneer RT-909
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Old 3rd December 2020, 09:14 AM   #30
nero52 is offline nero52
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Hi Rajkumar_
you can use any of them - no problem. Voltage is 5V and the current less than 5mA. I used a BC 107 (had this in stock).
Best regards
Richi
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