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antonio korton

Vacuum Tube Amplification  - 
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Paul Frederick's profile photoA. V. Dolganov's profile photo
2 comments
 
Right, bring that humming vacuum pump, who cares about noise anyway :D
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Carlo Orsettigh

Headphones and Headphone Amplifiers  - 
 
VENUSIAN headphone amp

inside view

The GU-32 is a soviet beam-power double tetrode, is used as an oscillator and a RF power amplifier operating in the metric wavelength range and in RF equipment. Equivalent to USA 832A tube.
But who said that these valves can not be used in audio range?
The GU-32s has a great sound, you just to know how to make work well!
Many tubes are built for different uses and beautiful sound in audio  amplifiers and preamplifiers.
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Carlo Orsettigh

Headphones and Headphone Amplifiers  - 
 
BIJOU ON STEROIDS headphone amp

I wanted to make a "pumped" version of the famous Bijoux headphone amplifier by Alex Cavalli. This is the starting point which I then modified.
In this project, developed first with Pspice to optimize it, I used two  triode 6S19P and one 6N23P-V for channel. Has been a long and careful looking for the best tubes working points and listening tests with various prototypes. This is the final version and is the best tube amplifier for headphones I've built (... and I have made many over the years).
As Venus amp the cabinet is constructed of aluminum scrap and MDF, I do not care the aesthetics but the best sound.
This is my best one! Great great sound and performance.
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Ink That! Offensive Security

Gizmos/Tweaks/Cables  - 
 
Ink That! Offensive Security originally shared:
 
Arduino and the Raspberry PI are a perfect starting point for anyone looking to get into DIY electronics because it's very easy to use and hard to mess up.
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Ed suwan

Phono and Line Level  - 
 
Garrard 401 with new plinth and diy magnet tonearm (inspiration from schroeder tone arm) and DIY bearing ta and wooden rod.. all a long tonearm 15" and 16.5". But this not yet finish...
12
Ed suwan's profile photo
2 comments
 
Dimention base WxDxH 80cm x 56 cm x 9.5 cm weight 44 kg exclude tonearm+base and plinth + garrard 401. Total all :minimum 65 kg. Finish.
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Ed suwan

General Discussion  - 
9
Ed suwan's profile photoLRoy Shreding's profile photo
2 comments
 
Yeah in guitar amps it the reaction time sag time thats important . The Neil Young Tweed Champ sound has about a second of reaction time for the 5Y3GT . If you play fast thats not going to work well.  If your Yngwie Malmsteen you go with Silicon Diode for speed and reliability.. Mesa Boogie has Dual and Triple Rectifiers where you can chose 2 or 3 sag times and punch them in via foot switch.
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Victor Panics

Gizmos/Tweaks/Cables  - 
 
The simplest phantom power +48V PSU
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Многим, кто конструирует звуковую технику (в частности, предусилители) наверняка в какой-либо конструкции требовался блок фантомного питания. Помимо применения такого блока в составе конструкции (например, блока питания для м...
3
Kiril Pahlev's profile photo
 
Thanks for sharing. Very useful... Nice!
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Andrew Weekes

Digital Audio  - 
 
Added a GPIO power switch to the Raspberry Pi Squeezeplug / Squeezelite player, one press and a clean shutdown, great for headless use on the bedside cabinet! Details from this site http://robertsaunders.org.uk/?p=2525
4
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Alex Dam

Speaker Building  - 
 
Diy speaker - Bass ultra
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2
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Created by

About this community

Listening to music though a system you built yourself is a source of pride, satisfaction, and pleasure. DIY Audio is for people who like both electronics and music, people with a native curiosity about how things work, and how to make them work better.

Menno de Graaf

Solid State Amplification  - 
 
Frequently, I get the question to add balanced inputs to the Mosfet Power Amplifier I made earlier:

http://www.djuke.nl/en/projects/1-power-amplifiers/3-mosfetamp

For various reasons (high imput impedance), a separate pcb seemed the right solution, so I made a proto pcb (first test with my CNC mill!) based on the Burr Brown INA134 IC. The major part is to make a stable +/- 15V supply from the +/- 50V poweramp rails. See the schematic.

The next question would be to check how good it actually is. So I did measurements with my EMU-1212m sound card revealing noise and distortion levels close to the measurement limit of the sound card.

Measurements:
- Loopback, straight from sound card analog out to analog in
- BalancedReceiver, from output of INA134 to soundcard analog in
- Mosfetamp, output of the mosfetamp via a voltage attenuator to the soundcard analog in

Conclusions:
- Because of the INA134 buffer, the frequency response of the BalancedReceiver is slightly better than the loopback
- The BalancedReceiver only gives a slight increase of noise level
- The added distortion of the BalancedReceiver is below the measurement limit

This is my first post on DIY audio G+ (although I have been involved in DIY audio for many years). Hope you like it and are able to use the info in your own project.
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1
Alexander “2kohm” M's profile photo
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Carlo Orsettigh

Headphones and Headphone Amplifiers  - 
 
BIJOU ON STEROIDS headphone amp

inside view, It is not precise as to the aesthetes and audiophiles like but the important thing is that it works well and it sounds better ...
2
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Carlo Orsettigh

Headphones and Headphone Amplifiers  - 
 
VENUSIAN headphone amp

This is my interpretation of the Martian headphone amp. (Platenspeler project)
I used two GU-32 and one 6N16P-V. The whole project was first developed with Pspice to find the best operating point and the best features. The power has been redesigned too. All with the objective to make a headphone amplifier as simple as possible.
Power on!  it worked immediately and now, after several hours of running, has a beautiful sound, with no distortion, no hum and no noise.
With my headphones Beyerdynamic DT990 Pro 250 Ohm then gives up!
The cabinet I have built with scrap aluminium pieces and MDF recovered from the wreckage of the workshop where I work, it is not beautiful but functional and then I listening to the music with open ears and eyes closed ...
21
Stephen Tack's profile photoRaymond Choi (VR2ZWV)'s profile photo
9 comments
 
You got it!
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Ed suwan

Phono and Line Level  - 
 
my garrard 401 tested with newplinth
11
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Andrew Weekes

Digital Audio  - 
 
Thought this might be of interest...

Today's fun, fixing a Jawbone Jambox

I've had this a while now, and it's an amazing bit of kit for it's diminutive size, producing levels of bass well beyond the apparent limits of physics (more on that later) but recently the unit stopped producing audio over bluetooth, you could hear the digital whines of data over RF, like interference, but no sound.

It turns out the AUX in jack has a couple of switch contacts on it, that can give problems. It can come about from leaving the jack plug in for extended periods, or, as I suspect in this case, a shock received, since I noticed some misalignment of the mesh grille around the switch / AUX in / USB socket.

Dismantling the Jambox is pretty easy, if you take care, and there's a pretty good video here showing the process nicely (https://www.youtube.com/watch?v=X5APtwqtEps).

Once apart the rogue contact is highlighted and I found the simplest fix was just to re-tension the contact, by inserting a 3.5mm jack plug (thereby opening the contact) then apply pressure with a suitably small pointy object to close the gap between the spring contact and the fixed one, don't close it completely, you need it to be open when the connector is inserted.

There's some interesting design features in this unit, the speakers vent into the sealed enclosure of the case, and attached to the rear panel is a passive radiator, with a larger surface area than the main speakers, designed to produce the bass. This alone wouldn't be sufficient so cleverly Jawbone have attached the mass of the battery to the radiator panel, and connected it via a flex-PCB, allowing that apparent physics-defying ability to move a greater mass of air, for good bass response, than would otherwise be possible.

A nice bit of ingenious engineeering!
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Link to the scheme in the comments on the original post
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Daniele Pantaleo (ozone89)'s profile photoPaul Frederick's profile photo
3 comments
 
+Daniele Pantaleo Just be careful with those IC spring sockets. Those things can cause a lot of problems. If I need to socket an IC I prefer the machined turret sockets myself. They're not much more money, and they are far more reliable. For the price of sockets I generally just solder ICs into circuits. As the chips themselves can be cheaper.
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julien vouilloux

Phono and Line Level  - 
 
A French mini documentary around recording with vinyl Ikazuchi Chez Le Forgeron - (How To make a vinyl): https://youtu.be/upSwmz49fhg
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4
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Klara Kopf

Digital Audio  - 
 
 
miniKORG
        a modification 2 die 4
9 comments on original post
3
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Thei Munten

General Discussion  - 
 
Started  blogging on my use of Rasberry PI as a music player.
Will (hopefully) finish over the next couple of days..
pro audio, loudspeaker design, bit perfect, fir filter, phase, audio experiments
4
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Victor Panics

Gizmos/Tweaks/Cables  - 
 
Soundcraft Notepad:
what for are made this holes under Jack port?
It's a Genial!
(Use google translato from Russian)
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1
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