diyAudio - Blog Entries
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

Audiosector 3785

Posted 12th June 2011 at 02:56 PM by charlesbahr

I built it! It sounds great. The downside is I struggled to find a low cost way to build the box and chassis. If I had simply followed the advice in the kit guide, I would have had an easier time of it, and it might not have cost any more.
The upside is I appreciate the box designs I have seen a lot more.
diyAudio Member
Posted in Uncategorized
Views 474 Comments 0 charlesbahr is offline
Old

Sustainable computer audio

Posted 11th June 2011 at 01:18 AM by abraxalito
Updated 8th September 2011 at 03:14 AM by abraxalito (Added new link to interesting article on semiconductor process development)

I'm wondering how many guys and gals out there on diyaudio are interested in sustainable computer audio? Let me unpack what I mean by this phrase for a moment....

Computers on their present course are obviously not a sustainable proposition. I've already posted about the demise of Intel but that's just the tip of the iceberg. Even if all CPUs move over to ARM A9 or A15 tomorrow there's still a huge unsustainable industry supporting the current wave of computers. There's the drive towards smaller feature sizes in memory which is going to hit a brickwall sooner rather than later. Increasing sizes of memory are like a drug that everyone's got addicted to. Remember Bill Gates' original prophesy that '640k will be enough for everybody'? He really meant it at the time. So I can't help but ask 'do we really, really need all this memory?'. My gut tells me not but to prove it requires some innovative thinking.

One of the things that got me thinking along these lines...
abraxalito's Avatar
diyAudio Member
Views 438 Comments 0 abraxalito is online now
Old

TSEC's Passive Ring Modulator In Action At Space Egg.

Posted 9th June 2011 at 09:42 AM by The Space Egg Corp

TSEC's Passive Ring Modulator In Action At Space Egg.
Attached Thumbnails
Click image for larger version

Name:	Passive Ring Modulator 2.jpg
Views:	248
Size:	152.4 KB
ID:	418   Click image for larger version

Name:	Passive Ring Modulator.jpg
Views:	172
Size:	185.5 KB
ID:	419   Click image for larger version

Name:	Xmas 2010 At Space Egg.jpg
Views:	151
Size:	139.6 KB
ID:	420   Click image for larger version

Name:	Xmas 2010 At Space Egg Studio.jpg
Views:	202
Size:	113.9 KB
ID:	421   Click image for larger version

Name:	Yamaha.jpg
Views:	119
Size:	119.2 KB
ID:	422  

Click image for larger version

Name:	ringmodulator (Large).jpg
Views:	509
Size:	30.6 KB
ID:	423  
The Space Egg Corp's Avatar
diyAudio Member
Posted in Uncategorized
Views 1565 Comments 0 The Space Egg Corp is offline
Old

TSEC's DM1 Soft Distortion Fuzz-Box (The Dirty Muther).

Posted 9th June 2011 at 09:08 AM by The Space Egg Corp

TSEC's DM1 Soft Distortion Fuzz-Box (The Dirty Muther).
Attached Thumbnails
Click image for larger version

Name:	Diode-closeup.jpg
Views:	491
Size:	580.3 KB
ID:	411   Click image for larger version

Name:	DM1.jpg
Views:	241
Size:	373.0 KB
ID:	412   Click image for larger version

Name:	DM 1.jpg
Views:	179
Size:	161.5 KB
ID:	413   Click image for larger version

Name:	DM-1.jpg
Views:	198
Size:	287.5 KB
ID:	414   Click image for larger version

Name:	DM- 1.jpg
Views:	150
Size:	168.0 KB
ID:	415  

Click image for larger version

Name:	DM -1.jpg
Views:	165
Size:	123.8 KB
ID:	416   Click image for larger version

Name:	DM Logo Close-Up (Large).jpg
Views:	2474
Size:	42.9 KB
ID:	417  
The Space Egg Corp's Avatar
diyAudio Member
Posted in Uncategorized
Views 1913 Comments 0 The Space Egg Corp is offline
Old

More Distortion? Yes Please!

Posted 3rd June 2011 at 04:58 PM by Pano

Can High Fidelity include audible distortion?

From the ultimate heights of fidelity we should hear a perfect reproduction of the recorded signal all the way from source to speakers right? Perhaps that depends on your idea of fidelity. Where does your fidelity lie? What are you being faithful to? To the recorded waveform, or something else? Could your idea of fidelity be that you want the final result to be faithful to the direct sound of the music? Is your goal a faithful reproduction of the music, or of the recorded signal? The two are certainly not mutually exclusive, but can often be at odds.

Low distortion is the second of the two founding pillars of HiFi - frequency response being the first. Any distortion alters the signal, therefore it must be wrong. Or so says conventional thinking. To be highly faithful to the signal, we must alter it as little as possible, granted the possible exception of overall level or volume. But what if our goal...
Pano's Avatar
diyAudio Moderator
Posted in Uncategorized
Views 2276 Comments 31 Pano is offline
Old

I guess I'll post this to my Blog!

Posted 2nd June 2011 at 08:01 AM by DigitalJunkie
Updated 2nd June 2011 at 08:08 AM by DigitalJunkie

Inspired by This Thread I decided to build something similar,I've though about it before,and had some parts sitting here,so what the heck!

Amp Schematic

PSU schematic


Here's what I've got at the moment.
25BQ6GTB tubes,(re-)branded DuMont. These are the skinny 6V6-sized bottles.(11W anode rating,and ~200V screen rating)

A pair of those are driving a 3.5K PP output transformer,rated for ~100W. (came from a scrapped Bogen M120 4x PPP 8417 amp.)

Bogen Schematic

B+=457V
Va=455V
B2+/Vg2=224V
Vg1=-43V
Vk (33ohm Rk's) ~1.3V ,About 40ma/tube.
(I saw cathode current peaks of ~80ma per tube,perhaps more? hard to tell with my DMM)

That gives a dissipation of ~18W per tube. Much more current and the plates start to 'blush'.
I did *not* see any screen glow,but the mica's on these particular tubes make it kind of hard to see much inside....
diyAudio Member
Posted in Uncategorized
Views 1763 Comments 0 DigitalJunkie is offline
Old

Yikes! Now what did I do?

Posted 1st June 2011 at 04:45 PM by Pano

This morning I was waking up the music server to have a listen. I run a Windoze XP box with JRiver Media Center.

JRiver gave me a pop-up error message that there had been an incomplete shutdown, did I want to fix any problems? There had been a power outage for a couple of hours last night that shut down the server. So if course I clicked "OK".

Bam! Screen goes dark. WTF? I look at the crossover and the tube amps - all dark. All dead. Now what I have done?

Well, it wasn't my mouse click that killed everything, the power was out again. Phew. But talk about scary timing. Click OK and everything dies right on the click.

Fortunately for us we have a 12KW generator that kicks in and can run the whole house.

All back to normal now.
Pano's Avatar
diyAudio Moderator
Posted in Uncategorized
Views 898 Comments 2 Pano is offline
Old

Bike: Update. (short post)

Posted 29th May 2011 at 02:42 PM by chris661
Updated 29th May 2011 at 02:46 PM by chris661

Me again, here's some updated pictures of my bike...

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I have only one question. Which smart-alec called a brake company "Hope"?!
Surely, DefiStop would be better?

First ride around was good, the fork needs a little fettling on the rebound/travel front (remote lockout is good though), plan to head up to the local woods and set it up there.

Cheers,
Chris
chris661's Avatar
diyAudio Member
Posted in Uncategorized
Views 929 Comments 1 chris661 is offline
Old

For those interested in Speakers Here how is made

Posted 27th May 2011 at 06:55 PM by ANYspeakersrepair

You can see how a speaker is made in
Discovery channel how speaker is made
or http://www.youtube.com/watch?v=VN0tmyyC0ak
Attached Thumbnails
Click image for larger version

Name:	logoBAL.gif
Views:	130
Size:	38.6 KB
ID:	410  
diyAudio Member
Posted in Uncategorized
Views 684 Comments 3 ANYspeakersrepair is offline
Old

ETI 480 Power Supply

Posted 26th May 2011 at 07:36 AM by jayb1

I have an old Dick Smiths ETI 480 Power Supply. What I don't have ia any information or the Scematic for it.Tthere is plenty of information for the 480 Amp, but that's not what I want. Just the instructions for the Power Supply.

Any help please.
diyAudio Member
Posted in Uncategorized
Views 968 Comments 1 jayb1 is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 02:39 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2