Roender's FC-100 prototype and builder's thread - Page 75 - diyAudio
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Old 25th April 2013, 12:45 PM   #741
atupi is offline atupi  Romania
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After waiting more than two months for 2SA/SC transistors to arrive i've lost my patience and installed what i had on hand.
The Mje 15034/15035 are 180/220 hfe but the 2SA/SC are a bit worse 140/190 hfe if i remember well.
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Old 25th April 2013, 01:02 PM   #742
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Adrian, I used the 2SA / 2SC being manufactured by ISC, when I built my prototype, and I remember that they have done a very good job as well.

Best regards - Rudi
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Old 25th April 2013, 04:37 PM   #743
atupi is offline atupi  Romania
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My transistors arrived in the end from Pacific Semi but after a looog wait.
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Old 3rd May 2013, 09:11 AM   #744
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A DIY-friend of mine, Andreas, and I are currently working on some improvements of our FC-100 builds.

We installed an ALU U-profile above the transformers, coated with µMetal, to absorb the magnetic field of the transformers.
We will use the top of the ALU-profile to mount supplementary PCBs and components there, for example: an additional bank of small
and fast capacitors supporting the PSUs' - backends, the LightspeedAttenuator PCB, ..., making the FC-100 an "integrated amplifier".

Apropos my Lightspeed Attenuator PCB: this small PCB does a really beautiful job! Its main job is of course to attenuate the music source's signal
(and it does this very delightfully), furthermore it selects the music source, displays the volume attenuation, the temperature of the heatsinks,
mutes, switches off-/on the FC-100, ..., and everything can be controlled by an infrared remote control unit.

I am currently working on a (the final) layout of this PCB that will include a Soft-Power-On circuit as well.
This will be the one that I will eventually offer in a separate group-buy (if there is some interest).

A SYMASYM can be built on a weekend - and that is it.
The FC-100 sounds so gorgeous that you won't stop but try to optimize its sound according to your ideas, experiences, ...
This is very challenging (be sure the FC-100 is worth it) and will take a long time, but this is why I "love" (besides its amazing sound) the FC-100.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg #0.jpg (353.1 KB, 334 views)
File Type: jpg #1.jpg (441.2 KB, 311 views)
File Type: jpg #2.jpg (388.1 KB, 286 views)
File Type: png #3.png (250.1 KB, 271 views)

Last edited by Rudi_Ratlos; 3rd May 2013 at 09:22 AM.
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Old 6th May 2013, 05:44 PM   #745
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Hi Rudi,

I've Always been interested in your ligtspeed PCB.

Nice work on the upgrade with the U-profile.

Regards,
Ronny
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Old 10th May 2013, 08:12 AM   #746
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Ronny, I am doing some slight progress and have annodized (varnished) the ALU-U profile
Find attached the current status of my FC-100 case and a closeup of the current version of the Lightspeed Attenuator PCB.
All of its functions work as designed and produce an adorable sound.

But you know that I am currently working on the Version 2 of the LightspeedAttenuator PCB, the final version that will include SoftPowerOn as well.
So you can do it all, leaning back in your armchair, switching on and off the FC-100, selecting the music-source, controlling the
volume, ..., with the means of your infrared-control-unit.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg Display 005.jpg (427.2 KB, 209 views)
File Type: jpg Display 012.jpg (446.0 KB, 108 views)

Last edited by Rudi_Ratlos; 10th May 2013 at 08:18 AM.
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Old 10th May 2013, 08:28 AM   #747
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This is how I fixed the LM35 temperature sensors on the heatsinks, and I have added an additional bank of fast reservoir-caps to each power-rail.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg LM35.jpg (58.8 KB, 110 views)
File Type: jpg fastcap.jpg (169.2 KB, 95 views)

Last edited by Rudi_Ratlos; 10th May 2013 at 08:31 AM.
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Old 10th May 2013, 11:37 AM   #748
bcmbob is offline bcmbob  United States
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Rudi, Have you experienced any vertical shift of the stereo image as the LDRs adjust the volume? Some have reported that effect with other LDR attenuation designs.
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Old 10th May 2013, 11:50 AM   #749
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Bob: I have ordered 150 LDRs for a German group-buy and selected / matched them as close as I could!
See my selection test-rig below.

None of the German DIYers reported about any shift of the stereo image.
On the contrary: they all felt that the Lightspeed Attenuator sounds more "airy, produces deeper bass, ..."

Best regards - Rudi_Ratlos

P.S. To make the attached image more clear, I should have inserted a LDR into the SIF - socket.
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File Type: jpg Mtaching 003.jpg (270.4 KB, 99 views)

Last edited by Rudi_Ratlos; 10th May 2013 at 11:52 AM.
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Old 10th May 2013, 11:56 AM   #750
bcmbob is offline bcmbob  United States
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That's good to hear. From reports by U. Dailey I understand matching can be a big/long process. Looking forward to more information on your final version of the module.

Thanks.
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