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Old

I2S transcoder

Posted 7th July 2013 at 01:57 PM by abraxalito
Updated 16th September 2013 at 02:32 AM by abraxalito (Schematics added, pic of 2nd build added)

Here's a circuit that's been a long time in gestation - some logic that converts I2S from 64fs (32bits per sample) down to 32fs (16bits).

Almost all the S/PDIF receiver chips nowadays output a bit clock at 64fs (2.8MHz for RBCD) because the format has the potential to support up to 24bits. When being driven from a CD player though, there's no chance of any useful information occupying those spare bits. As my interest is to run all signals as slow as possible to keep noise to the absolute minimum, 64fs to me is profligate generation of RF when 32fs will do the job. But only the WM8805 supports this format and then only when software programmed.

The other reason for wanting the slower bit clock is that my LAID design relies on shift registers and the 32fs clock gives me twice as good utilization of the serial storage - no bits are being wasted on zero padding.

This circuit is designed to do the job with the fewest standard logic chips I could manage...
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Old

Better than a box of chocolates

Posted 25th June 2013 at 07:17 PM by alexcp (My DIY projects)
Updated 25th June 2013 at 09:27 PM by alexcp

Got this today on the cheap - a box of 6N1P-VI, made in 1988, all new in authentic factory packaging. It is likely to keep me entertained for quite some time

Note: the PDF attachment is a scan of the factory three page insert from the box. It is in Russian and contains the pinout and electrical and limiting parameters of the tube but NO CURVES.
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Attached Files
File Type: pdf 6N1P.pdf (6.03 MB, 117 views)
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Old

High resolution pictures of my projects

Posted 19th June 2013 at 11:54 AM by dvb projekt

From today you will find high resolution pictures

of all my projects at my

flickr

Webside




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Old

The new Red Baron DAC Module V5.0

Posted 19th June 2013 at 11:30 AM by dvb projekt
Updated 8th November 2014 at 01:11 PM by dvb projekt (Stock status updated)

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-
...
Attached Files
File Type: pdf Red Baron V5.0.pdf (29.7 KB, 888 views)
File Type: zip TDA1541A Project - BOM - for The Red Baron V5.xls.zip (9.2 KB, 492 views)
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Old

Reference TDA1541A DAC Modules

Posted 14th June 2013 at 11:51 AM by dvb projekt
Updated 27th September 2013 at 02:27 PM by dvb projekt

TDA1541A DAC Module

Click the image to open in full size.
Click the image to open in full size.

- separate TL431 Shunt regulators for each voltage line
- independent voltage rail for the DEM reclock circuit
- I2S attenuator circuit
- shortest possible position for decoupling caps
- separate ground line for decoupling caps
- Ground plane
- 2mm pcb
- Immersion Gold
- green soldermask on both side
- 35m copper weight
- Board size 125mm x 125mm

in Stock

The price is:

TDA1541A DAC Module: $9

Worldwide shipping: $ 9
Europe shipping: $ 5
paypal fee: 3,9%

Shipping insurance on buyers request!


----------

The Ultra High Speed Buffer Module will be shipped "ready to use",
with three NC7SZ125 chips
...
Attached Files
File Type: pdf Reference TDA1541A DAC V2.3.pdf (559.7 KB, 456 views)
File Type: zip TDA1541A Project-BOM-Final.xls.zip (8.0 KB, 164 views)
File Type: pdf Takamisawa NA-Type.pdf (153.3 KB, 581 views)
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Old

All up (mostly) amp

Posted 12th June 2013 at 02:33 AM by mlise

Here's a shot of the waffle all built up. It's 32" wide and 32" tall with the amps on top, and flat. Typically deeper cabinets sound bedder then shallow ones, but the front to back bracing in this seems to fix it. Mica had an excellent suggestion to hinge it to fold in half. That's awesome. With a vertical hinge in the middle, it's all closed and protected to travel. Ron suggested being able to stack them 3 cabinets high for a wall of sound+ effect. Typical amps have basically a point source. The GD's wall of sound had vertical linear arrays (precursor of the modern line array by 40 years) of drivers. With this amp, you could stack them vertically and horizontally to make a field array. if you got closer, it wouldn't get louder, farther away it wouldn't get lamer. Mwaah ha ha ha...
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Old

Ultra high-end amplifier for Stax Electrostatic Headphones

Posted 11th June 2013 at 07:15 PM by dvb projekt

Because my Stax SR-404 Limited is now one year in his box without using...


Click the image to open in full size.

...i start a new project, based on the fabulous circuit from Andreas Rauenbuehler on high-amp.de




The Transistoramp V4.0

Click the image to open in full size.

My pcbs are ready and now i am collecting the parts.

A set of wonderful teflon Stax Pro and Normal jacks, ive got from a group buy on Head Case.

Click the image to open in full size. Click the image to open in full size.

So stay tuned...

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Old

Cabinet for class D bass amp

Posted 10th June 2013 at 08:54 PM by mlise

As seen in the D2 amplifier posting, I had built a pretty normal 4X10 cabinet with Eminence Beta10A's. I was talking to Ron Wickersham up at Alembic, and he suggested an idea he had. Make the cabinets shallow enough that the back pole pieces of the speakers were against the back of the cabinet and vent them outside. Sealed back drivers are problematic in bass amps because they overheat and the coil resistance either goes way up and the sound wimps out, or the coils outright melt. The Beta 10A's are vented and I've even gotten them up to where you can smell the varnish burning off the coils.
Flattening out the cabinet made it quite large. 32" square and only 4" deep.

http://www.diyaudio.com/forums/galle...665/Waffle.JPG

The frame around the outside is oak, but the front and back are only 1/8" masonite. To firm it up, there are masonite braces front to back radiating from each speaker into the corners and edges of each enclosure....
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Old

Class D Bass Amp

Posted 10th June 2013 at 08:24 PM by mlise

I've been working on a lightweight class D bass guitar amplifier. I originally started with the D2 Audio chipset now sold by Intersil.

http://www.diyaudio.com/forums/class...-bass-amp.html

I found that there was practically no support. Even though I was an FAE at Intersil, I couldn't find any documentation and most of the folks that worked on those parts had been laid off. The D2 parts were great. they had 12 output drivers per chip with a DSP pool, but it would be impossible to actually make a product with them.

Looking around, I found a bunch of parts at TI. I don't know if these came from National or TI originally, but there's a bunch of parts available at different power levels. The all seem to have integrated power stages. I chose the TAS5630. It has an analog input and will drive 300 watts into each of two channels. I ordered samples and started to collect parts to build an initial prototype, but I found complete amplifiers...
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Old

Better sounding anti-imaging filter

Posted 5th June 2013 at 02:46 AM by abraxalito
Updated 5th June 2013 at 03:00 AM by abraxalito

Still in the vein of AIF designs which utilize off-the-shelf inductors, I'm currently listening to this one and its thoroughly enjoyable. I built it with some very cheap bobbin-wound (unscreened) 10mH chokes I found on Taobao.

I don't recommend using unscreened inductors for this but if that's all you have the results are still aural candy. They do pick up a little low level mains hum, not noticeable except when close to the speaker. Also they interact - when I was checking the prototype filter for continuity I hooked up the LCR meter to the 4 inductors in series and found different answers - none measured 40mH. The result was from 32mH to 45mH (from memory - my filters are balanced so I have four sets of series Ls). I have them spaced apart by almost one coil diameter (about 6mm) so if you're going to build this I suggest greater spacing.

You'll note that this one's industrial strength in terms of its stop-band rejection - around 60dB. Whether this is obtained...
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