Parallel TDA1541A non-o/s DAC Kits

[siu sin man tho]

hi all,

I was prepare one set of the Parallel TDA1541A non-o/s DAC Kits.

This kit was very interest. very suitable to use for different size de-coupling caps. All the chips was plug & play.

let take a look for the items for the standard kits.

1. All caps was philips MKP caps.
2. Sanyo OS-con ( aluminium solid caps with Organic
semiconductive electrolyte).
3. all 1% Dale metal film resisters.
4. OFC 2mm thick PCB with Groud plate to low the noise.
5. Digital & analog rectifier cap use Elna high performance series
Gold label caps (25V 3300uf).
6. diode use MBR 160 or Schottky series to lower the noise.

Digital receiver can both use CS8412 or 8414.

Three Analog Output Stage for user choose.

1. 6C45 SE Analog Output Stage with 6X4 rectifier tube.
2. 6DJ8 SRPP Analog Output Stage with 6X4 rectifier tube which
after test by famous Diyer Thorsten's advise( improve the
Lower freq area).
3. AD844 op-amp.

any advise for the kits.

Now I was waiting the test print board to test for the noise.
Any comment for the parts that I choose. I will considerate to change.

thanks

thomas

[Blitz]

Do you plan to sell the boards ? This was exactly what I was looking for !

Do you plan as well to use a tube i/v-stage ?

Best Regards

[siu sin man tho]

hi blitz,

thanks for your reply.

this is our diyers website.

www.diyaudiocraft.com.

yes, I was planning to sell in the market. The price will reasonable. When I collect the board. I will take a photo & post to the forum.

this is the I/V stage, three small board for U to choose.

1. 6C45 SE Analog Output Stage with 6X4 rectifier tube.

2. 6DJ8 SRPP Analog Output Stage with 6X4 rectifier tube which
after test by famous Diyer Thorsten's advise( improve the
Lower freq area).

3. AD844 op-amp.

thanks

thomas

[Blitz]

So, youare not using a passive i/v-stage, but an active and each of these below do the i/v-conversasion ? Cool.

Thanks for the link, I registerd.

If your pricing is as reasonable as mdlovers is, count me in for a tube solution.

[siu sin man tho]

hi blitz,

the price will expensive than mdlover.
U know that all the parts all were choose after I test many times.
I know some of the diyers will choose different grade of parts.
But all the parts that I shows is the standard kits.
The OS-con, Dale all were experience parts.
Diodes too.
I think the estimate price will around USD 200 with all parts.
Is it very reasonable. The main point to design the kits is share erperience to all diyers. Not loss the capital money & had a little profit to support the web is OK. If everyone made the product & aim poit is earn money. NO better good will benefit to diyers.


www.diyaudiocraft.com

thanks

thomas

[siu sin man tho]

Hi Blitz,

So, youare not using a passive i/v-stage, but an active and each of these below do the i/v-conversasion ? Cool.

the i/v-stage I use will be same as many people use.
The opt stage use a 33R resisters to ground to change I/V. But in my test. I test that use two 75R resisters parallel will be better than one 33R . The noise will be lower.
This experience will be same as I call one computor monther board factory to produce the DAC board. They had skillful to produce full ground layer.
After I test,I considerate use three layers. The middle one is the full ground plate. Although the price of the monther board that use OFC, middle ground plate will be higher. But the rersult is +ve.
So I choose.


this is my opinion.

www.diyaudiocraft.com

thanks

thomas

[Blitz]

I am interested to understand the details, I thought you sell only pcbs ? On the link of your web-page I have not found any information about the kit, can you send me the precise link or more information ?

Why not using an active tube i/v-stage ? Should be even better than passive as the DAC sees only 2-3 ohm than the 33 Ohm of the resistor.

Best Regards

[siu sin man tho]

Hi Blitz,

thanks for your opinions.

I was testing the PCB in the last condition( Test Print).
I would like to know that any improvement or not.
I will let U know when PCB final version on hand & will email to U the real board or post in the forum.
Your opinion I considerate already. So I had jumper on the Output stage. Diyer can do by themselves to choose active or passive tube i/v-stage .
This is real diy.

this recent days I was testing the tin foil, copper foil cap in the decouple cap that will effect the sound. I hope more information can give diyer more data to reference.

thanks

www.diyaudiocraft.com

thomas

[siu sin man tho]

hi all,

perhaps not too many people know about the sanyo OS-con cap.
This cap is special in digital circuit.
low noise, low esr. with OFC lead out & silver plated.

This is another cap except Elna, & Blackgates that was good for digital use.

This is the best that I can follow with the standard kits.

pls see the photos.

thanks

thomas

[cmt42001]

Hi Blitz,

Why not using an active tube i/v-stage ? Should be even better than passive as the DAC sees only 2-3 ohm than the 33 Ohm of the resistor.

I don't think the TDA1541a will be happy going into low i/v loading, and you need the i/v resistor around 22-47 ohm to get the voltage out for the next stage.

BTW, What do you meant by active tube i/v stage? Are you thinking about using tube as a current gain stage, your enlightment please.

Regards

CMT