Go Back   Home > Forums > Blogs

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Old

Stumbled upon btinterface

Posted 16th July 2013 at 07:32 PM by merlin2069er
Updated 19th July 2013 at 11:36 AM by merlin2069er (adding links...)

I was browsing the google play store one day when I came across something called BTInterface.

Anyways, that free btinterface program led me to btinterface.com where I watched a few of the videos posted. I was immediately impressed with the possibilities. So I bought an android phone, and installed the btinterface app.

I picked up a couple of arduinos (mega 1280) about $12 each, and bt modules, about $8 on ebay, and also picked up some relays to fool around with (about $12) and jumper cables...

BTInterface will allow you to connect to a bt module, then send commands to it. You need a sketch on the arduino to do something with those commands.

BTInterface being a bit limited in what it can do - I purchased basic4android.

So, with basic4android I put together a few screens, on a couple of tabs. The first tab, "Sources" - allows you to edit the name and select a source (these names are saved to an internal...
merlin2069er's Avatar
diyAudio Member
Posted in Uncategorized
Views 450 Comments 2 merlin2069er is offline
Old

Interesting Horn info

Posted 11th July 2013 at 10:55 PM by DougL

In this post the User clams that the Compression driver Atlas PD5V is a derivative of the WE555, which was good down to 100 Hz


http://www.diyaudio.com/forums/multi...ml#post3558010

There was also mention of an AES paper on how to create a phase plug for a cone driver.

Based on Romy's ideas on a mid-bass horn, This might cover down to 200 / 300 hz to transition to a Tapped horn.
diyAudio Member
Posted in Uncategorized
Views 362 Comments 2 DougL is offline
Old

I2S transcoder

Posted 7th July 2013 at 12:57 PM by abraxalito
Updated 16th September 2013 at 01:32 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...
Attached Thumbnails
Click image for larger version

Name:	I2Slogic1.JPG
Views:	345
Size:	69.0 KB
ID:	1110   Click image for larger version

Name:	I2Slogic2.JPG
Views:	232
Size:	63.1 KB
ID:	1111   Click image for larger version

Name:	P3110065.JPG
Views:	171
Size:	673.7 KB
ID:	1134  
abraxalito's Avatar
diyAudio Member
Views 1191 Comments 28 abraxalito is offline
Old

Better than a box of chocolates

Posted 25th June 2013 at 06:17 PM by alexcp (My DIY projects)
Updated 25th June 2013 at 08:27 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.
Attached Thumbnails
Click image for larger version

Name:	IMG_0242.jpg
Views:	109
Size:	45.3 KB
ID:	1099   Click image for larger version

Name:	IMG_0243.jpg
Views:	101
Size:	43.0 KB
ID:	1100   Click image for larger version

Name:	IMG_0237.jpg
Views:	89
Size:	60.0 KB
ID:	1102   Click image for larger version

Name:	IMG_0238.jpg
Views:	96
Size:	54.5 KB
ID:	1103   Click image for larger version

Name:	IMG_0239.jpg
Views:	73
Size:	41.5 KB
ID:	1104  

Click image for larger version

Name:	IMG_0240.jpg
Views:	76
Size:	40.0 KB
ID:	1105   Click image for larger version

Name:	IMG_0241.jpg
Views:	73
Size:	88.7 KB
ID:	1106   Click image for larger version

Name:	IMG_0234.jpg
Views:	72
Size:	88.9 KB
ID:	1107  
Attached Files
File Type: pdf 6N1P.pdf (6.03 MB, 86 views)
alexcp's Avatar
diyAudio Member
Posted in Uncategorized
Views 381 Comments 0 alexcp is offline
Old

High resolution pictures of my projects

Posted 19th June 2013 at 10:54 AM by dvb projekt

From today you will find high resolution pictures

of all my projects at my

flickr

Webside




dvb projekt's Avatar
diyAudio Member
Posted in Project builds
Views 472 Comments 0 dvb projekt is offline
Old

The new Red Baron DAC Module V5.0

Posted 19th June 2013 at 10:30 AM by dvb projekt
Updated 25th February 2014 at 02:29 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, 567 views)
File Type: zip TDA1541A Project - BOM - for The Red Baron V5.xls.zip (9.2 KB, 329 views)
dvb projekt's Avatar
diyAudio Member
Posted in Offer
Views 1444 Comments 0 dvb projekt is offline
Old

Reference TDA1541A DAC Modules

Posted 14th June 2013 at 10:51 AM by dvb projekt
Updated 27th September 2013 at 01:27 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, 320 views)
File Type: zip TDA1541A Project-BOM-Final.xls.zip (8.0 KB, 126 views)
File Type: pdf Takamisawa NA-Type.pdf (153.3 KB, 310 views)
dvb projekt's Avatar
diyAudio Member
Views 1024 Comments 0 dvb projekt is offline
Old

All up (mostly) amp

Posted 12th June 2013 at 01:33 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...
Attached Thumbnails
Click image for larger version

Name:	amp1.jpg
Views:	92
Size:	50.0 KB
ID:	1095  
Attached Files
diyAudio Member
Posted in Uncategorized
Views 257 Comments 0 mlise is offline
Old

Ultra high-end amplifier for Stax Electrostatic Headphones

Posted 11th June 2013 at 06:15 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...

dvb projekt's Avatar
diyAudio Member
Views 788 Comments 0 dvb projekt is offline
Old

Cabinet for class D bass amp

Posted 10th June 2013 at 07:54 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....
diyAudio Member
Posted in Uncategorized
Views 206 Comments 0 mlise is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 06:23 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2