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The white van is in Tucson

Posted 8th January 2010 at 04:27 PM by relder (Rob's active 3way with transconductance chipamps build blog)

I haven't been propositioned for white van speakers for several years (outside of a home depot.) But a guy I know was taken in this last week after leaving the ATM.

Why always a white van, why not mix it up with a red one or something?

They are a lot more sophisticated it seems now.

It might be fun to borrow his newly acquired $300 sound system and measure them, but I think I'd rather use my time on real audio projects.
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Old
Rating: 7 votes, 4.43 average.

Tech note: voltage regulators-1

Posted 7th January 2010 at 05:10 PM by jan.didden
Updated 11th February 2010 at 03:31 AM by Jason

There are lots of types of voltage regulators, but in this installment I’ll talk about series regulators.

What’s a regulator? It’s all in the name: it REGULATES the voltage to the circuit to be powered to keep it constant and as free of noise and ripple as practical. The ‘regulation’ means that there is some circuitry that compares a reference voltage, like from a zener diode, to the regulated output voltage, and then uses the difference between the two to adjust another element to null that difference. The ‘compare-and-correct’ is crucial for a regulator, and is done by negative feedback….

Look at Fig 1: is there a regulator in there? No, they are all circuits that try to give a constant, ripple free voltage, but if you start to draw varying currents from them, the output will vary with that current and there is no mechanism that somehow tries to null out that variation. Fig 1c is better than 1b, because Q1 buffers the voltage from the zener reference, so...
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Old

Old Style DCB1 information

Posted 1st January 2010 at 01:53 PM by Tea-Bag
Updated 13th October 2010 at 12:48 AM by Tea-Bag (updated some more timely info)

The basics on the boards....
The hypnotize is a 1 input/1 output Shunt regulated Direct Coupled Pass like B1 buffer. It has a relay delayed startup to avoid DC problems for the amps. This board (and even Mez) can be used just as a shunt power supply, and their is a thread for this also.

The Mesmerize can use up to 6 muting relay inputs, and is a larger board. All others matters being equal.


Here are some relevant threads.
http://www.diyaudio.com/forums/group...hunt-psus.html

http://www.diyaudio.com/forums/pass-...ml#post1854512

http://www.diyaudio.com/forums/power...t-reg-pcb.html

Attached is a semi-built DCB1 mesmerize. Also the main schematics of the device, in case you need to troubleshoot. The below shot is a bare Hynotize PCB.
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File Type: pdf DCB1 BOM V4.2.pdf (44.6 KB, 3705 views)
File Type: pdf SalasDCB1shuntreg build guide v4.1.pdf (50.7 KB, 1862 views)
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Old

Top plate finished...

Posted 1st January 2010 at 12:58 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

finally..

Just a little sanding. And hopefully I will be able to put a layer of primer down.
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Old

What I'm listening to

Posted 31st December 2009 at 11:37 PM by alazira

http://www.amazon.com/gp/richpub/lis...m_aya_bb_lists
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Old

looks like -

Posted 18th December 2009 at 09:04 PM by tomtt
Updated 8th January 2010 at 07:21 PM by tomtt

too many changes, too soon.


only 2 ways out.

face the music (!PoP Music!)

or this -




YouTube - suicide is painless - 4077th tribute

(what to do ....?)

?

?
`````````````````````````````````````

or this -

Welcome to the Frontpage

Popfreeradio.com - Wikipedia, the free encyclopedia


~~~~~~~~~~~~~~~~~~~~~~~~~~~



Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.

http://img190.imageshack.us/img190/1709/1013903p.jpg


Click the image to open in full size.

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

Help

Posted 18th December 2009 at 02:03 PM by ed444ed

Hi

i am a first year architecture student and my current project is one where we are asked to reinterpret a space using a device that we must invent! our site is a long railway bridge with many tunnels. the device is supposed to help navigation around a space. i am passionate about music and sound and play many instruments and produce music myself.
the device i intend to create is based on the principle that sound travels more effectively through different materials. (gasses liquids and solids)
i want to create a device that attaches to a surface in the space and emits a sound. perhaps a pickup that is attached to a glass and connected to an amplifier. so that the sounds around the area are amplified in a way that is unusual. i have never experimented with audio electronics so i am sure that this is alot more complicated than i am aware of! PLEASE GIVE ME TIPS!!!!
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Old

Looking for a good place to Blog ...

Posted 9th December 2009 at 05:31 PM by PB2 (Pete Basel's Test Blog)
Updated 9th December 2009 at 05:34 PM by PB2

Just trying this out. I tried out Wordpress and found that it was rather limited in formatting in that many of the offered templates were not what I wanted. Perhaps this is better, or full custom would be better. I'm not really looking to do a chronological blog as much as a static place organized by pages or categories to post my thoughts and selected projects. Many of the Wordpress templates did not even get the hierarchical pages right, and you have to pay to edit the CSS.

Wordpress test blog: http://petebasel.wordpress.com/


Pete B.
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Old

A few pcb's more...

Posted 7th December 2009 at 08:40 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 7th December 2009 at 08:58 PM by Bas Horneman

With a dayjob and other "stuff" in my life. I don't always feel like conquering the cold and messy shed to go do some drilling. But I usually have other projects running parallel that I can do something on. Pictured here is the Pass B1 and the lightspeed pcb's. Stuffed...primarily because..... that way I won't loose parts in my messy hobby room.
Click the image to open in full size.

The Kendeill caps were too big for the B1 board. So I soldered the neg terminal to the neg hole in the pcb and wired the plus to the positive rail.

The wires of the 10uF cap I bent to go beneath the pcb and almost touch. I did this on purpose because I have some 0,22uF smd caps that will act as bypass for the Audyn polyprops. They will go between them wires there.
Click the image to open in full size....
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Old

More iPods N' Things

Posted 3rd December 2009 at 12:22 AM by kevinkr

Well those PX100 headphones came a couple of weeks ago, have to say acoustic sounds was quick on the shipping..

To say they are an upgrade over my old JVC folding phones would be just a bit of an understatement. They're just clearly better in every not so subtle way. Much more extension at both extremes, and much improved clarity - a surprising amount of resolution IMHO for $69..
They're not circum-aural, and have open backs, but surprisingly ambient noise does not seem to be much of an issue. And they're reasonably comfortable.

On a slightly different note I have a fairly large number of songs on my iPod that I downloaded from iTunes. Recently I swapped a not so well liked Pixies album for BT Emotional Technology on Swaptree. I have listened to it a few times and realized that the songs I actually like best are none of the ones I purchased on iTunes! I ripped it to the iPod last night using Apple Lossless and removed the original AAC encoded copies....
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