Sharing all my digital work - will downloaders pay to maintain diyaudio? - diyAudio
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Old 2nd January 2004, 12:30 AM   #1
cm is offline cm  Singapore
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Default Sharing all my digital work - will downloaders pay to maintain diyaudio?

I have learnt a lot from this site, and would like to contribute back to the community. I have read that the site needs servers, bandwidth etc. And I hate getting banners etc that will ineveitably come with as a means to fund continued existence of the site.

How about hosting schematics, PCB patterns etc for downloading, and downloaders will be requested to pay a voluntary donation towards the upkeep of the site?

As a start, I have the following:

1. PCB layout for a 4x TDA1543 passive DAC
2. Schematic and PCB for a Sony EIAJ to I2S converter so that all thise who have CXD xxxx controller chips can use the famed TDA1541A without the need for SPDIF.

All my other work are not worth much anyway and should stay within the forum.

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Old 2nd January 2004, 12:39 AM   #2
cm is offline cm  Singapore
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Pictures of my TDA1543 DAC board
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Old 2nd January 2004, 12:40 AM   #3
cm is offline cm  Singapore
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Close up of one of the TDA1543 - there are four similar ones.
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Old 2nd January 2004, 12:54 AM   #4
cm is offline cm  Singapore
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My heavily modified Pionner CD player. Made all these changes:

1. All diodes changed of schocky 1N5817. Bypass the diodes with caps.
2. COmmon mode choke before the bridge rectifiers.
3. replaced all the 78xx and 79xx regulators with TL431 derived ones, with LC choke inputs and Sulzer inspired cap across cathode to ref to reduce gain as freq increase ( gives better trebles )
4. NE5534 changed to LM6172
5. removed coupling caps and muting caps at output.
6. implemented KC7 clock. Picture below shows the PCB ( with Elso's asychn reclocker not completed yet - cannot find 100 MHz crystal. I will not provide the PCB as it is not my IP to give.

Alternative output:

1. Tapped EIAJ signal from CXD1135 to connect directly to TDA1543As
2. EIAJ converter to I2S to connect to TDA1541As
3. Valve output for the TDA1541A
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Old 2nd January 2004, 12:59 AM   #5
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For how much do you plan to sell the stuff?
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Old 2nd January 2004, 12:59 AM   #6
cm is offline cm  Singapore
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Pictures of the valve output stage:

Yes, I used common flourescent lamp ballast as chokes, and two halogen lamp transformer for the PS. One for the filament, and the other to step back up to 240Vs. The 13W ballast are cheap, 3H in value, and can take 170mA. I hope my missus do not find out that certain lights in the house no longer work not because they failed....
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Old 2nd January 2004, 01:07 AM   #7
cm is offline cm  Singapore
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I do not intent to sell any of these stuff. If the moderators of the site thinks that no money is need to keep this site going, then I will post them for free.

If the idea of donations flies, then anyone can donate anything they want, zero if that is what they can afford. They can come back and donate money when they become millionaires.

However, they are not to be used for commercial money making schemes without my approval.
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Old 2nd January 2004, 04:21 AM   #8
SY is offline SY  United States
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Quote:
If the moderators of the site thinks that no money is need to keep this site going, then I will post them for free.
Speaking as a moderator, I assure you that some money is needed to keep this site going.

Speaking as a member, I appreciate your idea and effort here to keep this resource afloat.
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You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
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Old 2nd January 2004, 02:23 PM   #9
dhaen is offline dhaen  Europe
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Default Speaking as a member....

The main site ethic, is one of free inormation exchange. We help each other.

The ideal situation is to have a commodity (such as PCB's) that can be sold at a lower price than individual members could do themselves. That becomes a win-win situation.
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Old 2nd January 2004, 09:29 PM   #10
Benjlv is offline Benjlv  United States
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there are some site born projects out there. Perhaps these popular circuits could be sold as kits or PCBs. I particallaly like the idea of PCBs since its so expensive to get them made and to make them...of course we all know that.

Perhaps every section of the site can come up with a circuit. Chip amps can put up a gain clone... solid state can come up with some sort of ultimate amp...digital can do a DAC....and or a cd-player...etc.

or we can always go to banner adds...they dont bother me too much.
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