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

Ohms Law Calculator

Posted 29th March 2010 at 03:02 PM by klewis

http://www.sengpielaudio.com/calculator-ohmslaw.htm
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 370 Comments 0 klewis is offline
Old

Calculate for resistors in Parallel

Posted 29th March 2010 at 02:58 PM by klewis

http://www.sengpielaudio.com/calculator-paralresist.htm
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 315 Comments 0 klewis is offline
Old
Rating: 2 votes, 4.00 average.

DAC End 2

Posted 29th March 2010 at 01:33 AM by quanghao
Updated 29th March 2010 at 02:16 AM by quanghao

INTRODUCTION

After the good result obtain with the DAC End I have design with Nguyen Quang Hao a set of boards to create a cheaper project with a sonic performances very near.

The No Oversampling DAC give a more natural sound but if you ear the TDA1541 and TDA1543 seem to lose details.

The AD1865N-K with passive I/V give a perfect combination, natural sound and all the details.

The AD1865N-K give the better performances with a 200ohm MK132 Caddock as passive I/V.

In this configuration the output signal is too low to drive any amplifier so I have design for the AD1865N-K the better output stage.

This DAC use a single ended vacuum tube amplifier without the expensive output transformers used in my original DAC End.

The DAC board follows the original design but has been inserted a jump to switch the phase of output signal.

In any vacuum tube stage the signal on the anode is in out phase...
Attached Thumbnails
Click image for larger version

Name:	Picture-077.jpg
Views:	3762
Size:	335.6 KB
ID:	132   Click image for larger version

Name:	Picture-115.jpg
Views:	2422
Size:	407.5 KB
ID:	133  
Attached Files
File Type: zip Cricuit DAC-END.zip (214.4 KB, 829 views)
diyAudio Member
Posted in Uncategorized
Views 5901 Comments 1 quanghao is offline
Old

First spider done.

Posted 27th March 2010 at 06:40 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 14th February 2011 at 06:51 PM by Bas Horneman

The Takman resistors have thick copper wires. This makes for wonderfully strong little spiders.

I've also used ceramic terminals strips for the first time and it makes for a nice strong construction.

And I did the ccs for the phase splitter a while ago.

[edit] I used silver solder. But found out that it is NOT necessary with these fakes. Fake or not it make for a great construction.

"TEKTRONIX CERAMIC STRIPS, HISTORY and GENERAL INFORMATION
Tektronix first developed and used ceramic strips in their oscilloscopes in 1952. During the manufacturing process, silver in liquid form is painted in and on the notches of the strips prior to the application of the final glaze and final firing. The silver is then firmly bonded to the ceramic and wires can be soldered directly to the ceramic.

Special silver-bearing solder should be used when soldering to ceramic strips so the silver bonded to the strip does not...
Attached Thumbnails
Click image for larger version

Name:	spider.jpg
Views:	762
Size:	175.4 KB
ID:	130   Click image for larger version

Name:	ccs_phase.jpg
Views:	796
Size:	95.9 KB
ID:	131  
Attached Files
Bas Horneman's Avatar
diyAudio Moderator Emeritus
Posted in Building
Views 1700 Comments 2 Bas Horneman is offline
Old

for pmillet sound card interface

Posted 18th March 2010 at 06:09 PM by klewis

Tonight I found out it is a really good idea to ground the shaft/body of the rotary switch in order to eliminate pick up of 60Hz and its harmonics. I noticed moving my hand closer to the metal knob on this switch resulted in a >20dB increase in 60Hz spectra and the addition of somewhat lower level harmonics at 120Hz, 180Hz, and 240Hz.. I grounded the switch with a piece of 28ga wire between the lock washer and the body of the switch and grounded it to the board ground. This totally eliminated any pick up with no noticeable line frequency or related spectra. (My case is totally shielded on the top and bottom, but not sides, front or rear - and does not appear necessary to do so.)
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 528 Comments 0 klewis is offline
Old

maudio thread

Posted 18th March 2010 at 02:57 PM by klewis

http://www.diyaudio.com/forums/tubes...-question.html
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 343 Comments 0 klewis is offline
Old

Side tracked

Posted 18th March 2010 at 12:28 PM by jtktam (Newbie audio DIYer)

I have been side tracked lately. not enough time to do the F5 like I wanted.

I ended up digging up the BOM for mini aleph and ordered the parts for that.. started to solder the parts and found that I needed to soldier mount the resistors because they are way too big for the PCB

I need to double check all the blank spots, clean up the flux on the board and start on the power supply..
diyAudio Member
Posted in Uncategorized
Views 637 Comments 0 jtktam is offline
Old

YARPS (Yet another regulated power supply) updated 2012/01/02

Posted 18th March 2010 at 11:30 AM by wintermute (Wintermutes Rantings)
Updated 2nd January 2012 at 10:24 AM by wintermute (added formula as well as a few other minor edits)

10 Feb 2011. AndrewT pointed out something really dumb I had done (in a most polite way) in the original circuit. The caps in the filter section are in series and effectively halved in value. The circuit will behave much better simply by deleting half the caps. I've uploaded the latest version of the file. Sorry to the 125 people who have already downloaded, and I hope I didn't cause too much head scratching as to why I had done that, I'm not even sure myself, and I'm surprised I never realised. I'm going to revamp this blog entry as there are some things I have realised since I first posted, but that will be over the next couple of weeks. Hopefully I will finally build it soon.

I have been spending an inordinate amount of time using LTSpice lately. The more I use it the more I like it! For someone like me who is somewhat challenged mathematically, and who's electronics theory knowledge level is well below where it should be (to be doing this sort of design anyway),...
Attached Thumbnails
Click image for larger version

Name:	ripple_compare.png
Views:	4565
Size:	6.3 KB
ID:	137   Click image for larger version

Name:	impedance_compare1.png
Views:	4236
Size:	15.8 KB
ID:	138   Click image for larger version

Name:	impedance_compare2.png
Views:	933
Size:	13.0 KB
ID:	139   Click image for larger version

Name:	YARPS.png
Views:	1837
Size:	27.6 KB
ID:	328  
Attached Files
File Type: zip YARPS.zip (6.0 KB, 220 views)
wintermute's Avatar
diyAudio Moderator
Posted in misc, Simulation
Views 5193 Comments 2 wintermute is offline
Old

reforming capacitors

Posted 16th March 2010 at 02:50 PM by klewis

from AndrewT

Apply 16Vdc through 100k resistor and measure how the resistor voltage varies with time. The resistor voltage is a rough indication of the cap leakage+charging current.
Once charging is substantially over the remaioining current is predominantly leakage +-a little bit of chage/discharge current depending on the stability of the supply.

The apparent leakage is very much affected by the DC supply voltage. A good regulated DC supply that is held at constant temperature will help a lot.

You may find that 6hours at 100k gets to within 105% of the ultimate leakage current. But tell us what you find.

You can reform a bank of caps using one resistor to feed each capacitor.
Measure across each resistor to see how similar or different the caps are.
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 1507 Comments 1 klewis is offline
Old

Sound measurement software

Posted 15th March 2010 at 08:05 PM by klewis

this one seems to seperate THD from noise

www.Virtins.com
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 367 Comments 0 klewis is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 02:23 AM.


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