Roender's FC-100 Rev.1 Group-Buy - Page 53 - diyAudio
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Old 27th February 2013, 06:54 PM   #521
zsaudio is offline zsaudio  Europe
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Rudi and Metal you've done a nice work again!
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Old 3rd March 2013, 01:33 PM   #522
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Yesterday night I have "married" the prototype of the new "multi-purpose Lightspeed-Attenuation board" with an old, discarded SYMASYM
of mine (see image attached).
Everything works as designed, I do not preceive any hum, every functionality can be controlled by an infrared - control unit, ...
(look at post #520)

I have ordered 10 of the PCBs and will build them with some of my German DIY friends, before I will offer this PCB to the community.
But: be sure - this small PCB is a real gem and an adeqaute mate for your FC-100.

Best regards - Rudi_Ratlos
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Last edited by Rudi_Ratlos; 3rd March 2013 at 01:42 PM.
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Old 27th March 2013, 08:52 AM   #523
atupi is offline atupi  Romania
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Any news regarding "multi-purpose Lightspeed-Attenuation board" Rudi?
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Rega RP-1/Simplistic RIAA by Salas/ DCB1 clone/ MyRef Fremen Edition/FC-100/ XTZ 99.26 MkII speakers
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Old 27th March 2013, 09:45 AM   #524
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Adrian, I have already received a dozen of professionally etched PCBs and am currently busy packing the components that I offered
in the 1st round (see my post #522) into boxes.

The groupbuy includes:

- the PCB
- 2 matched pairs of LDRs
- a BOURNS 100K motorized potentiometer
- a small transformer 7.5VAC / 4.5VA
- a pre-programmed PIC 16F886 µProcessor and a 28-pole socket

I have built a test-rig and measured the value of the photocell-resistor of a LDR at 10 different levels of current flowing through the LED.
Since I have ordered a big quantity of LDRs, I am able to offer well-matched LDR pairs to everybody who participated in the 1st round.

I have currently 2 sets left. You can have one, if you like.
Find attached the matching result of the LDRs belonging to one of these spare sets.
Colums B-K show the resistance of the photocell while the LED is connected to a 5V power supply through resistor B1-K1.

I have already written a Builder's Manual (in German Language).

The BoM (not including the LCD-display) can be found here:
https://secure.reichelt.de/index.htm...05;PROVID=2084

The price for a set is 53.45€. Worldwide shipping is included.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg LSA.jpg (332.3 KB, 257 views)
File Type: png Image1.png (9.1 KB, 235 views)

Last edited by Rudi_Ratlos; 27th March 2013 at 09:52 AM.
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Old 27th March 2013, 10:25 AM   #525
atupi is offline atupi  Romania
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I would like to buy one kit. Sent you a PM.
Thanks,
Adrian
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Old 27th March 2013, 10:29 AM   #526
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Rudi,You've got PM for the last set
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Old 27th March 2013, 10:46 AM   #527
mj777 is offline mj777  Philippines
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im late for the last one, maybe on the next round i will participate.
regards to Sir Rudi.
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Old 27th March 2013, 11:18 AM   #528
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Marjohn, I will do a 2nd round of groupbuy of "my Lightspeed Attenuation" - PCB in this forum,
but only after all the participants (a dozen) of the 1st round really approve it and "kick their current solutions into the bin."
This may take some while though.

Best regards - Rudi_Ratlos
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Old 2nd April 2013, 02:19 PM   #529
atupi is offline atupi  Romania
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How about you Rudi, did you kiked your previous volume control solutions to the bin?

Just joking, i have an PGA2310 wich works really good, but i'm so curious to "see" how good these "optical resistors" can sound.

Last edited by atupi; 2nd April 2013 at 02:28 PM.
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Old 2nd April 2013, 03:25 PM   #530
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Adrian, I have already sent you a small parcel with the "Lightspeed Attenuator" PCB.
You should have it within the next few days.

Best regards - Rudi
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