diyAudio - Blog Entries
Go Back   Home > Forums > Blogs
Home Forums Rules Articles diyAudio Store Gallery Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Lynn Olson's Book List

Posted 30th September 2010 at 03:52 PM by DougL

This speaks for itself:
http://www.diyaudio.com/forums/multi...ml#post2318365
diyAudio Member
Views 804 Comments 0 DougL is offline
Old

My new speaker system

Posted 25th September 2010 at 01:03 AM by Sammumba

My job at the garage has been reduced to 4 days a week, which is great as it means I have an nice long weekend break. With all the free time I'm going to be working on my custom car stereo system.

My Nissan Micra probabaly doesn't have the best speaker system around.. Which is just as well because I'm going to upgrade it!!

I'm going to break open my old PC speaker sytsem

Click the image to open in full size.

And install it in my car. The sound qouality is amazing and I'm sure I'm going to get a lot of enjoyment out of it too.
diyAudio Member
Posted in Uncategorized
Views 796 Comments 0 Sammumba is offline
Old

Zen IV

Posted 13th September 2010 at 06:05 PM by DougL
Updated 15th September 2010 at 11:37 PM by DougL

Nelson has created a storm of interest with the Zen I/V.

I have a DAC that I can use this with, a K&K RAKK DAC Mk1.

Currently, it has a passive supply and a switchable shunt resistor.

So I am brainstorming on what it would take for an active Zen I/V with a shunt volume control, and both SE and Balanced outputs.

Basics: PCM1794 has differential outputs with 8 ma current output.
http://focus.ti.com/lit/ds/symlink/pcm1794.pdf
So I need 2 Zen I/V per channel.
At present, I am running a DCX2496 Digital crossover, so balanced outputs are a plus.

I am considering using the buffer from this post.
Since bipolar supplies are required for the I/V section, a buffer that does not require additional caps seems prudent.

For the volume control, either http://www.kandkaudio.com/linestage.html Shunt Stepped attenuator or a single LDR replacing the K&K unit.

Finally,...
diyAudio Member
Posted in My Projects
Views 2204 Comments 2 DougL is offline
Old

Need 150 to 200watts amplifier achematic

Posted 10th September 2010 at 01:44 PM by yoyomaster01

Hi to everyone!!!

I'm new i this site
I just want to ask for some pcb and schematic for a 200watts amplifier

Can P3A amplifier from ESP modified?
and add some more output tannies?
maybe 3 pairs?

I want to use MJE2955 and MJE3055 for the outputs.....

Any body?
diyAudio Member
Posted in Uncategorized
Views 1051 Comments 1 yoyomaster01 is offline
Old

Common emitter amplifier design II

Posted 9th September 2010 at 08:27 PM by wakibaki

In the earlier post, basic common emitter amplifier design, I made reference to increasing the gain of the amplifier by bypassing the emitter resistor R[SIZE="1"]E[/SIZE].

In this case the gain referred to is the AC gain, which is the signal gain, and which is the gain we are primarily interested in with regard to audio amplifiers. The gain previously calculated was the DC gain, which was numerically identical to the AC gain, but since the amplifier was decoupled from the preceding stage with a capacitor, there was no DC applied to the transistor other than that provided by the bias network, which set the standing current to 1mA and the output voltage to 10V. DC gain and offset is important, because a decoupling cap can be avoided in some cases, but not here.

In the earlier post the gain was stated to be R[SIZE="1"]C[/SIZE]/R[SIZE="1"]E[/SIZE]. This was a simplification, and, more strictly the gain is R[SIZE="1"]C[/SIZE]/(R[SIZE="1"]E[/SIZE]...
Attached Thumbnails
Click image for larger version

Name:	common_emitter_4.jpg
Views:	1946
Size:	17.7 KB
ID:	255   Click image for larger version

Name:	common_emitter_5.jpg
Views:	1929
Size:	18.2 KB
ID:	256   Click image for larger version

Name:	common_emitter_6.jpg
Views:	3551
Size:	16.9 KB
ID:	257  
Banned
Posted in Uncategorized
Views 6222 Comments 0 wakibaki is offline
Old

100-160w mosfet amp

Posted 7th September 2010 at 08:30 PM by johnalexwarren

This is my first serious amp project. It uses the IRFP9240 & IRFP240 MOSFETs and delivers 100WRMS into 8Ω or 160WRMS into 4Ω at 0.1% THD.

Many thanks go to Edwin Paij @ AED (http://users.swing.be/edwinpaij/welcome.htm) for the design .

I have now gathered the majority of components and am currently active in the forum looking into PSU design...
diyAudio Member
Posted in Uncategorized
Views 1850 Comments 2 johnalexwarren is offline
Old

Turntable Technics SL-3 Wiring Diagram wanted

Posted 6th September 2010 at 04:45 PM by SirErik

Hey, I've got my Technics SL-3 turntable power supply damaged by a high voltage burst from the power station. I've found out that the transformator is damaged, but I haven't been able to find a new one. The number on it is SLT48DT 15E. I need to know either where to buy a new transformator or what specifications (voltage 240/? . .) this transformator has. Anyone who can help me solve this problem?
diyAudio Member
Posted in Uncategorized
Views 1874 Comments 0 SirErik is offline
Old

LME49830 based amp

Posted 4th September 2010 at 07:02 PM by alexcp (My DIY projects)
Updated 8th October 2012 at 11:26 AM by alexcp

This is an implementation of National's reference design for LME49830 with two matched pairs of 2SK1530+2SJ201 per channel. The PCBs were made using National's gerbers (thus National's logos). Sounds surpisingly good, but it has just been completed; I did not have a chance to listen to it carefully yet.

Update: I rebuilt the amp as a pair of monoblocks, each delivering healthy 200W into 8 ohms. It now looks tidier.

Update: the original Gerbers from National are nowhere to be found since national.com was merged into ti.com. Attached are the original archives downloaded from the national.com.
Attached Thumbnails
Click image for larger version

Name:	IMG_2067.jpg
Views:	2461
Size:	72.0 KB
ID:	251   Click image for larger version

Name:	IMG_2066.jpg
Views:	3618
Size:	65.9 KB
ID:	252   Click image for larger version

Name:	IMG_2068.jpg
Views:	1545
Size:	53.8 KB
ID:	253   Click image for larger version

Name:	IMG_2069.jpg
Views:	4472
Size:	56.7 KB
ID:	254  
Attached Files
File Type: zip LME49830_EF125WT1_Gerbers_Web.zip (133.8 KB, 538 views)
File Type: zip HP_PowerSupply_4B_Gebers_Web.zip (87.4 KB, 326 views)
alexcp's Avatar
diyAudio Member
Views 8077 Comments 5 alexcp is offline
Old

YAGC (Yet Another GainClone)

Posted 4th September 2010 at 06:58 PM by alexcp (My DIY projects)
Updated 5th September 2010 at 08:59 PM by alexcp

This was unavoidable, I guess. Dual mono LM3886 kit from ChipAmp.com with Avel Lindberg's transformers in a wonderfully compact enclosure from Design Build Listen. I liked the simplicity but not the sound. Why is everyone so excited with gainclones? IMHO, Papa's Zen V4 is not much more complicated to build (although no kit is available), but is so much more an interesting experience!
Attached Thumbnails
Click image for larger version

Name:	IMG_2058.jpg
Views:	1205
Size:	41.0 KB
ID:	247   Click image for larger version

Name:	IMG_2059.jpg
Views:	905
Size:	41.5 KB
ID:	248   Click image for larger version

Name:	IMG_2060.jpg
Views:	2046
Size:	63.0 KB
ID:	249   Click image for larger version

Name:	IMG_2061.jpg
Views:	2257
Size:	59.7 KB
ID:	250  
Attached Files
alexcp's Avatar
diyAudio Member
Views 3402 Comments 0 alexcp is offline
Old

Lm60 from AmpsLAB

Posted 4th September 2010 at 06:54 PM by alexcp (My DIY projects)
Updated 7th July 2011 at 01:33 AM by alexcp

Last year I got an Lm60 kit from AmpsLAB. This year, I finally got an enclosure from Design Build Listen and a power supply and built it. Each channel is built on a small (120x60mm) one-sided PCB and uses one 2SK1058+2SJ162 pair in the output stage. With proper biasing, the sound is good, esp. for such a simple and compact design. I should have started with this one, rather than with the (equally inexpensive) K-8LS.
Attached Thumbnails
Click image for larger version

Name:	IMG_0353.jpg
Views:	528
Size:	50.4 KB
ID:	433   Click image for larger version

Name:	IMG_0352.jpg
Views:	440
Size:	59.3 KB
ID:	434   Click image for larger version

Name:	IMG_0350.jpg
Views:	762
Size:	62.9 KB
ID:	435   Click image for larger version

Name:	IMG_0348.jpg
Views:	475
Size:	62.3 KB
ID:	436   Click image for larger version

Name:	IMG_0344.jpg
Views:	578
Size:	65.7 KB
ID:	437  

Click image for larger version

Name:	IMG_0342.jpg
Views:	846
Size:	77.7 KB
ID:	438  
Attached Files
alexcp's Avatar
diyAudio Member
Views 3155 Comments 0 alexcp is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 03:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2