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My Ikea Blanda Bowl Build Diary

Posted 6th April 2013 at 07:56 PM by mondogenerator

So upon seeing many nice Blanda bowl projects here on DIYAudio I thought it about time I had a try and see what all the fuss is about!

About a year or so past I went through a phase of buying the nicest small wide-band drivers I could. Whether I achieved this is subject to the readers' opinion

So I have a pair of Mark Audio Alpair 5, and a pair of Tangband W3-1285SG. Both of these drivers were available to me in the UK at a very similar price-point and they both fall roughly into the 3" wide-band category. (Shown in the following picture alongside some Tangband 2" drivers)

Click the image to open in full size.

I chose to buy the 20cm Blanda bowls in bamboo. Gross volume works out at ~2 litres. Factor in stuffing or denser absorbent and I guesstimate a 1 litre volume.

This is really too small for the Alpairs, but the 2 dB rise towards the cut-off wasn't...
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Old

Tube-I-zator V3.0 - Out of production

Posted 5th April 2013 at 03:28 PM by dvb projekt
Updated 16th September 2013 at 05:16 PM by dvb projekt

Tube-I-zator V3.0

Click the image to open in full size.

The evolution brings the following changes:

- Anode PSU with Salas SSHV Shunt Reg. onboard
- External B+ Input for usage with other Anode PSU
- Heater PSU with C-R-C filtering
- Heater PSU with Softstart circuit
- Heater PSU Power LED

Thanks to John (-ecdesigns-) for the following suggestions!

- Grid stoppers to prevent unwanted oscillations
- Bias current injection for TDA1541A usage
- Pull-down resistors to keep the coupling cap output at GND-potential

Still on the Module:

- Heater switch for 6N2P or 12AX7 usage



An example for a balanced use (e.g. Bufalo II), you could see HERE.



The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 193x157 mm
Surface
...
Attached Files
File Type: pdf Tube-I-zator V3.0.pdf (30.2 KB, 839 views)
File Type: zip Tube-I-zator V3.0 - BOM.xls.zip (7.6 KB, 391 views)
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Old

A poll. Basic electronics and DIY audio.

Posted 2nd April 2013 at 01:46 AM by rjm (RJM Audio Blog)
Updated 4th May 2013 at 10:54 PM by rjm

It came up at the help desk, but I want to put this before diyaudio.com members generally:

I feel strongly that people who build audio equipment as a hobby should take it upon themselves to obtain a basic understanding of both the practical and theoretical aspects of electronics. Take a trip to the library and read through the first couple of chapters of electronics textbooks, that kind of thing.

It's more than just the safety aspect, I think of it as a basic necessity...

So, how many people here are familiar with the following statement?

The impedance of a capacitor is -j/([omega]C)

Familiar as dirt? Never heard of it before?
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Preamps are not line level.

Posted 1st April 2013 at 04:57 AM by rjm (RJM Audio Blog)

If you don't think about it too hard, you'd imagine that the signals in the phono stage would be smaller than the signals in the line level preamplifier stage that follows it. Or that the signals in the DAC/CD player would be about the same level or slightly lower than the signal in the preamplifier.

As usual, the answer is "it depends". It depends on the sensitivity of your speakers, how loud you are listening, and the voltage gain of the amplifier. It also depends on whether we are talking about a MM phono stage or low output MC.

My point is simply this: the volume control is an attenuator, and at the typical "9 o'clock" position the input signal is reduced in magnitude by about 35 dB.

That cuts it back down to being comparable to the output of a moving magnet cart, and much, much smaller than anything found in a DAC stage.

It means you absolutely, definitely, positively must spend as much effort and care...
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Old

FM tuner for Jitter analysis

Posted 29th March 2013 at 03:34 PM by 1audio

A few quick notes on using a tuner for digital audio clock jitter analysis (before I forget the details). Someone here (I have forgotten who) suggested an FM tuner for monitoring jitter. After a little research and experimentation I went pretty deep into figuring this out.

First the internal clocks on ADC's and DAC's have strong harmonics into the FM band. Second, FM tuners are very sensitive to modulation to carriers. modulation and jitter are closely related. The other advantage of this is that the jitter/phase noise is multiplied by the ratio of the actual carrier and the harmonic you are looking at. E.g. a 22.5792 MHz clock becomes 90.3168 MHz with the noise amplified by a factor of 4.

This is very simplified but covers the essentials-You need a really low noise FM tuner. Sound good is not an issue. The Yamaha TX-930 and TX-950 are possibly the lowest noise tuners ever made. They can be had for around $100 on eBay. What I did was to take the output directly...
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Old

Red Baron V4.0 - 3.3V I2S attenuator modification

Posted 29th March 2013 at 01:15 PM by dvb projekt
Updated 28th July 2014 at 10:04 AM by dvb projekt

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Red Baron V4.0 free running DEM oscillator modification

Posted 29th March 2013 at 12:02 PM by dvb projekt
Updated 28th July 2014 at 10:07 AM by dvb projekt

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Old

Personal announcement

Posted 26th March 2013 at 05:24 PM by dvb projekt
Updated 26th March 2013 at 05:27 PM by dvb projekt

Well my friends it is time again to say thanks to all of you, who like and ordered my pcbs.

Because i am no developer of electronic circuits but have the knowledge to design pcbs,
i wanted to give something back to the community.

Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009,
a small donation from every sold pcb goes to diyaudio.com

Today i am proud to say that your cumulated donation achieve

$ 3104

Keep on having fun with my pcbs and best regards

Oliver
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Rating: 2 votes, 5.00 average.

Tube-I-zator / TDA1541A recommended modification #2

Posted 24th March 2013 at 02:10 PM by dvb projekt
Updated 28th July 2014 at 10:15 AM by dvb projekt

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Old

I didn't even know this site offered blogs...

Posted 21st March 2013 at 05:28 AM by Midnightmayhem

I did not know that you could do this until just now so bear with me. I intend to make this a main outlet for the cool stuff I build.
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