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Old 17th June 2013, 03:30 PM   #1001
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Default matched quads

these look ok?

Genuine Toshiba 2SK170BL 2SK170 JFET Transistor N Channel Quad Match | eBay
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Old 18th June 2013, 06:05 AM   #1002
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Quote:
Originally Posted by merlin2069er View Post
I ordered from this source in the past. No problems!

http://www.ebay.com/itm/4x-Toshiba-O...item4d0d70e60a


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Last edited by dvb projekt; 18th June 2013 at 06:08 AM.
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Old 18th June 2013, 03:33 PM   #1003
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Quote:
Originally Posted by dvb projekt View Post
Did you see the offer on DuchAudioClassics.nl ?

For sale: NOS Philips TDA1541A S1 single crown

I've contacted them, no reply yet.
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Old 18th June 2013, 03:36 PM   #1004
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Oh, I just ordered the jfets... quads in matched pairs. That should be ok, right?
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Old 19th June 2013, 10:33 AM   #1005
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Quote:
Originally Posted by merlin2069er View Post
Oh, I just ordered the jfets... quads in matched pairs. That should be ok, right?
Matched are not necessary, but ok...
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Old 19th June 2013, 10:34 AM   #1006
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Exclamation The new Red Baron DAC Module V5.0

The new Red Baron
V5.0


Click the image to open in full size.


The evolution brings the following changes

- Jumper for I2S / simultaneous mode
- latest 3.3V attenuator for I2S & simultaneous mode (by -ecdesigns-)
- free running DEM oscillator (by -ecdesigns-)
- additional U.FL pads for I2S & simultaneous mode
- Separate U.FL-GND route to Digital-GND


Still on the module

- Separate I2S-GND route to Digital-GND
- Separate Analog Output GND route
- Separate GND route for active divider decoupling caps to Analog-GND
- Modified active divider decoupling pads for better SMD 1210 caps soldering
- Un-interrupted ground plane
- Direct shunt voltage inputs with shortest onboard traces
- I2S In-/Outputs with shortest onboard traces
- Onboard Grounded-Gate MOSFET Current Buffer I/V Stage
(-ecdesigns- MK7 version)
- Separate GND-Trace for I2S / simultaneous mode attenuator
- Master/Slave connectors for parallel DAC module usage and external I/V Buffer stages e.g. Tube-I-zator & DDNF Stage
- no SMD Design



Click the image to open in full size.


The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 125x73 mm
Surface finish: Immersion Gold
Copper weight: 35m
Soldermask: Both sides - red
Silkscreen: Legend on top


In Stock

The price will be as followed:

Professional 2-Layer PCB: $15
Worldwide shipping: $ 9
Europe shipping: $ 5
paypal fee: 3,9%

Shipping insurance on buyers request!

A donation of $3 USD to diyAudio will be done for every pcb sold.


The DAC module V2.3 will still be available for those,
who want to use it without the TDA1541A Shunt module!




If you want to use the onboard Grounded-Gate MOSFET Current Buffer I/V Stage,
you need additionally the DC-Reference Module




Description

Because the Grounded-Gate Buffer is connected between the DAC output and the passive I/V resistor,
normally the I/V resistor is connected between the DAC output and GND,
you must get rid off the approx. 4V DC on each I/V resistor.
Therefore we must get a new reference GND for each channel.

The circuit is connected to the ref.+5V at the output of the buffer and GND,
with a decoupling cap for each channel.
By trimming each voltage so it exactly matches DC voltage on the I/V resistor,
the DC voltage between I/V resistor and reference becomes zero.
In other words, the DC component is removed without using a coupling cap.



Click the image to open in full size.

Click the image to open in full size.


Material: FR4 - 2mm
Layers: 2
Board size: 54x34 mm
Surface finish: Immersion Gold
Copper weight: 35m
Soldermask: Both sides - red
Silkscreen: Legend on top


Following parts are needed:
2* 2-Way vertical header; 5mm pitch - Mouser Part No.: 571-2828362
2* 470F/min. 10V decoupling cap - Mouser Part No.: 647-RR71A471MDN1
2* 1K0 multiturn trimmer - Mouser Part No.: 652-3006P-1-102-LF



In Stock

The price for it is $9

Worldwide shipping: $ 4
paypal fee: 3,9%


Shipping insurance on buyers request!


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Old 19th June 2013, 01:32 PM   #1007
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Awesome.

Hmm, I'd like to know a bit more about your reference PSU for the red baron. Is there a separate thread for that?

Would you happen to have the front / top / back panels cutouts in a .dwg or pdf? I'd love to have them if you'd share them.

Thanks.
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Old 19th June 2013, 01:41 PM   #1008
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Quote:
Originally Posted by merlin2069er View Post
Awesome.

Hmm, I'd like to know a bit more about your reference PSU for the red baron. Is there a separate thread for that?

Would you happen to have the front / top / back panels cutouts in a .dwg or pdf? I'd love to have them if you'd share them.

Thanks.
Its all here in this thread.

If i start the housing, i could share the cutouts, sure
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Old 22nd June 2013, 01:11 PM   #1009
neda is offline neda  United States
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Oliver,
How would you compare the Red Baron board's, V4.0 & V5.0 when used with the Tube-I-zator? Which do you prefer?

B-R
Ned
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Old 22nd June 2013, 01:23 PM   #1010
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Quote:
Originally Posted by neda View Post
Oliver,
How would you compare the Red Baron board's, V4.0 & V5.0 when used with the Tube-I-zator? Which do you prefer?

B-R
Ned
Hi Ned,

definitely the V5.0 with U.FL connection.

I dont know if its the new layout, the U.FL connectors, the new Pin 4 to AGND connection with the new jumper or all together, but the sound is much more 3 dimensional and instruments are so realistic.

and this with I2S input! What sound may we expect in simultaneous mode with Ians pcm board.

Lets see


Cheers,
Oliver
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