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The Red Baron DAC Module V4.0 - Out of production

Posted 8th February 2013 at 09:34 AM by dvb projekt
Updated 19th June 2013 at 11:26 AM by dvb projekt

The Red Baron
V4.0



Click the image to open in full size.


The evolution brings the following changes

- 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
- Onboard SOT353 footprint for fastest DEM-Synchronizer ICs
- Un-interrupted ground plane
- MOSFET Source/Drain failure corrected


Still on the module

- Direct shunt voltage inputs with shortest onboard traces
- I2S In-/Outputs with shortest onboard traces
- I2S Attenuator and DEM Synchronizer
(by -ecdesigns-)
- Onboard Grounded-Gate MOSFET Current Buffer I/V Stage
(-ecdesigns- MK7 version)
- Separate GND-Trace for DEM-Synchroinizer
- Master/Slave
...
Attached Files
File Type: pdf Red Baron V4.0.pdf (593.7 KB, 456 views)
File Type: zip TDA1541A Project - BOM - for The Red Baron V4.zip (9.3 KB, 171 views)
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Old

Phonoclone boards, soldering, and Q1, Q2.

Posted 7th February 2013 at 06:34 AM by rjm

This is in response to several recent emails I've received, where people were having problems with, typically, one board having a bad V+ or V- regulated voltage output.

The number of cases relative to the number of boards shipped caused me to worry that a manufacturing error might have occurred, so at my request I had a customer return the phonoclone boards he had built to me for inspection.

I'm happy to report that the problem was traced to poor soldering technique, the boards themselves are fine. What had happened was solder had cooled before the component had fully settled, and pushing the component down to the board surface then tore the trace away from the bottom of the board, breaking the circuit.

Subsequently, thinking the transistors blown, he replaced them, doing a fair bit of damage to the pads of Q1, Q2.

Fortunately, I was able to fairly quickly set everything to rights, and the boards are now on their way back to him....
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Old

Another Ikea Bowl Speaker

Posted 3rd February 2013 at 12:04 PM by googlyone

I stumbled on the people making speakers from the Ikea bowls. It kind of inspired me as the speakers were truly different and bizarre, but at the same time something completely different.

So I had to make some.

I fumbled around in the cupboard and came up with three choices of woofers that would do OK in a small enclosure - and after a few measurements and stuff settled on a pair of old Vifa M13SG-09-16 drivers. These were pretty well suited to an enclosure of a bit over 8 litres.

This drove me to the larger bowl, a 28cm one.

This is how they came out...

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To fit the driver I simply routed a rebate - and then cut the inside out.

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The material of the bowl was quite thin once I had finished routing things - so I cut out a circle of ply and glued it to the inside of the bowl. I had to go out for the evening at that point so I simply...
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Old

6C33C OTL - Completion, break in, tuning and impressions

Posted 27th January 2013 at 05:08 PM by wlowes

Done! The second went much faster and was playing music in 2 weeks.

Now that they are running I will borrow from the circuit designer's own description of the sound as it really does sum it up..

"There is no substitute for power and that is what this amp has. Complex musical passages are effortlessly reproduced with a natural depth and breadth unmatched by any other amp. Subtle nuances are clearly revealed underneath pounding crescendos.

Striking imaging causes instruments to be layered in a three dimensional sound stage that recreates the experience of a live performance. The music "opens up" and leaps out of the loudspeaker eliminating any box like sound. The most minute and subtle sounds are revealed producing uncanny realism. Musical voices are warm and lifelike yet completely neutral with a razor sharp focus."

In my own words.. incredibly natural. 3D and layered sound. Deep bass with weight creates...
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Old

F6 Clone Convertible PCB blog

Posted 27th January 2013 at 01:48 PM by Tea-Bag
Updated 29th June 2013 at 08:30 PM by Tea-Bag

Here is the F6 board rendered by CRT and some help from others.

Click the image to open in full size.


It's convertible premise is to be able to swap out transformers using daugter cardsand be able to swap out variations on the schematics Nelson Pass presented at the 2012 Burning Amp Festival.
Additionally, places for two pairs of 2SK/2SJ are here to allow GR's to be used to allow for higher than 8ma IDSS without degeneration on the front end. If you have 8ma IDSS BL grade for use here, than your all set.
You can use standard power resistors or 5MM thin film type.

Click the image to open in full size.

Here are some of the daughter cards that mount to the main board. They are available for Jensen, Cinemag and Onetics Quadfilar transformers.
These are mounted with 2 2x10 @ 2.54 mm pins. Note the PC PINs of...
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Old

High-end chipamp build project

Posted 24th January 2013 at 08:21 AM by abraxalito
Updated 15th February 2013 at 06:12 AM by abraxalito

Go here : Possibly the most frugal high-end sounding amp?

If you have comments, feedback, critique or improvements and don't want to put it on that thread, feel free to leave it in the comments here.

Here are the first measurements - the Nitro amp being fed by the Ozone DAC with a six-tone multiple, peak digital level -20dB. Peak output power around 100mW in an 8R speaker (connected for this test). It looks from this that the datasheet is a little pessimistic on THD, though here I'm measuring the TDA8566, not the 8561. No measurement graphs are presented in the 8566 DS and the 8561 only has plots for 2R and 4R loads, not 8R.

Schematic now added. BOM here : https://docs.google.com/spreadsheet/...Hc&usp=sharing

Additional schematic showing how to use TDA8566Q in place of TDA8561Q as the latter isn't available from Mouser. Mouser only has fewer than 300 TDA8566Q in stock so best...
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Old

My Horn Project

Posted 22nd January 2013 at 12:13 AM by DougL

I have 2 Horn projects.
I would like to try a
SEOS / Econowave style with a SEOS 12 / 15 and a Denevo 360 compression driver.

I also want to try a LTO style 3 way
http://www.diyaudio.com/forums/multi...ml#post3189501

I am trying t do this inexpensively.
Looking at JMLC 400 1.4" mid-ranges
Radian 636 CD
B&C DE10 or B&C DE7 CD
JMLC 1000 or JMLC 1400

Looking for an approprate woofer.
The GPA 515 is beyond my means at the moment.

JBL 2226H are also reputed to be great

The TD15M has a following.

I have a DCX2496 and 6 channels of 30W class D amplification.
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Old

Featured VT: The 6BQ7

Posted 19th January 2013 at 08:01 PM by Miles Prower

Click the image to open in full size.

This is a small signal dual triode in the nine pin mini format. From the spec sheet:
Quote:
The 6BQ7A is a miniature, medium-u, twin triode primarily designed for use as a cascode radio frequency amplifier in very high frequency TV tuners. In this application, its performance is characterized by low noise figures and high gain.
From the piccie, it's obvious that this is indeed a high frequency triode. It has the additional advantage of a high gm, made possible by the comparatively enormous cathodes. These are much larger than those of other small signal types like the 12AU7, 6FQ7, 6SN7, 6C4. The 6BQ7 also has a u-Factor that falls nicely between types like the 12AU7 or 6FQ7, and the 12AT7.

The spec sheet even includes a composite plate characteristic for cascode operation. What you don't find is any mention of any sort of audio applications. The RCA Receiving Tube Manual does make a concession...
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Old

Boozehound Labs MM Phonostage

Posted 19th January 2013 at 06:06 PM by MagnumOpus

I needed a decent RIAA, and have found that I really like the sound of J-Fets. Maybe its purely metaphysical, maybe not. Still I am thrilled with the sound of of this thing. It it buildt with the kit from Boozehound Labs ebay listing.

At first I thought it sounded somewhat "too fast", too dynamic, too..."bouncy"..but when settled in..I am just flabbergasted by how sweet sound so little money can buy.

The only thing is the power supply. I have tried to different wallwarts, both incredibly noisy, and both switchmode, allthough my latest is regulated it still produce a lot of noise. So, I am building a Sigma 11 to power this thing, I'll have to live with the noice for now, it will only be for a couple of months anyway.

Pictures to come when I remove it from my setup to take som gut-pictures .
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Old

Featured VT: The 6J5

Posted 19th January 2013 at 03:37 AM by Miles Prower

This type is a singleton triode with an octal base. As nine pin mini types proliferated during the early 1950s, few singleton triodes were made, and the few that you do find are almost always VHF amp types intended for 400MHz+, running as grounded grid amps. Most triodes were made in pairs, such as the 12A*7 series, or the 6FQ7, 6DJ8, etc. If you need a singleton triode in the seven or nine pin mini format, you will either have to go with a type like the 6C4 (a type that is not recommended as an audio triode, but rather a low power, Class C RF driver/final) or make a pseudotriode from a small signal pentode. (The 6AU6 works nicely for this, and it has a u-factor that fits nicely between the medium-u triodes like the 12AU7 and the high-u types like the 12AT7 or 12AX7).

The 6J5 appeared with the Octal base, and metal envelope. There is also a glass Octal as well, but is much harder to find, and more costly to acquire. Regardless of packaging, the type is a small signal, medium-u,...
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