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

Aleph "MJ" using SemiSouth SJEP120R100 outputs

Posted 8th August 2010 at 09:29 PM by Tea-Bag
Updated 9th August 2010 at 12:34 PM by Tea-Bag

So I believe I am finished with the Mini-A version modified for SemiSouth R100 output. The MJ is not in reference to Michael Jackson, rest his soul. Simply a reference to Mosfet input, JFET output.

Technical pieces:
R8 is a 1K pot. This allow for some DC offset adjustment.
R18, This affects drain current to differential pair. This value is lowered. I chose 220R resistor since I have a bunch of them. Papa presented this as needed on mod's in general for the lower VGS of the R100 (~1.5v)
R19, gate resistor to Power JFET R100. This is lowered to 47R. We see with F1J and F2J that gate resistors are lower.


Rail Voltage is +/-24v
Source voltage is .425v and is largely determined by the 100K pot settings and heatsinks on hand. The real value of the pot is ~ 70-80k here. I let the IRF240's run no higher than 65c and R100's no higher than 70c.


Sound

Previously I had R18 at 392 default and R19...
Tea-Bag's Avatar
diyAudio Member
Posted in Uncategorized
Views 2879 Comments 0 Tea-Bag is offline
Old

Mis-understood ArT - Part II

Posted 6th August 2010 at 10:15 PM by tomtt
Updated 19th January 2011 at 11:42 PM by tomtt

i actually spoke to Taylor Swifts agent.

he cleared up a few unanswered questions,

i had about the 'Kanye/Taylor incident.'

http://img836.imageshack.us/img836/7...itowebcam5.jpg

Click the image to open in full size.

http://gifsoup.com/MTMyODAxNw


http://www.radioworld.com/article/105742

http://www.fundinguniverse.com/company-histories/Ballantyne-of-Omaha-Inc-Company-History.html
tomtt's Avatar
diyAudio Member
Posted in Uncategorized
Views 614 Comments 0 tomtt is offline
Old

Up and running

Posted 4th August 2010 at 09:08 PM by stripe157

As of August 4, at 4:01, this is an official, working amplifier!

Once I decide on a volume control knob, I'll make a wooden face plate for it and call it finished... for now.
diyAudio Member
Posted in Uncategorized
Views 692 Comments 1 stripe157 is offline
Old

PassDIY LDR

Posted 30th July 2010 at 10:10 PM by DougL
Updated 14th September 2010 at 06:33 PM by DougL

http://www.diyaudio.com/forums/analo...ml#post2258073

This looks cool.
diyAudio Member
Views 924 Comments 1 DougL is offline
Old

Binding posts/RCA

Posted 27th July 2010 at 04:11 AM by stripe157

Click the image to open in full size.
diyAudio Member
Posted in Uncategorized
Views 646 Comments 2 stripe157 is offline
Old

How low can you go?

Posted 26th July 2010 at 06:46 AM by abraxalito
Updated 31st August 2010 at 04:28 AM by abraxalito

The prices of DVD players just keep on going down here. Yesterday I bought my very first 99RMB [that's under $15] model in Carrefour. I couldn't wait to get home to see how it sounded.

First up I listened to one of my favourite BIS recordings - Mozart 40 in a version for piano, flute and strings. The sound really wasn't as bad as I'd expected - the cello sounded really 'reedy' rather than full-bodied and the flute was akin to a sopranino recorder in its higher register with very little bloom. But there was a fair approximation to a soundstage and really quite decent dynamics, not at all 'bitstream'.

Rebecca Pidgeon's 'Spanish Harlem' is the test disc I use to check for sibilance (it has lots of 's' sounds), and sure enough there was some but definitely not terrible considering the price.

This undoubtedly had potential for the price - I wondered if it could be improved. Inside almost all the functions are integrated on the MediaTek chip (although it...
Attached Thumbnails
Click image for larger version

Name:	P2200409a.JPG
Views:	447
Size:	45.2 KB
ID:	192   Click image for larger version

Name:	P2200410a.JPG
Views:	443
Size:	50.0 KB
ID:	193   Click image for larger version

Name:	P2200413a.JPG
Views:	378
Size:	90.0 KB
ID:	194   Click image for larger version

Name:	P2200416a.JPG
Views:	374
Size:	67.4 KB
ID:	195  
abraxalito's Avatar
diyAudio Member
Posted in Uncategorized
Views 851 Comments 1 abraxalito is online now
Old

Chassis by Dell... with tubes

Posted 20th July 2010 at 06:15 PM by stripe157

Click the image to open in full size.
diyAudio Member
Posted in Uncategorized
Views 397 Comments 0 stripe157 is offline
Old

Chassis by Dell

Posted 20th July 2010 at 05:00 PM by stripe157
Updated 27th July 2010 at 07:48 AM by stripe157

Under construction:
Click the image to open in full size.

Click the image to open in full size.

Front:
Click the image to open in full size.

With some black satin sprayed on:
Click the image to open in full size.

Click the image to open in full size.

With TubeLab.com's Simple SE board:
Click the image to open in full size.

Click the image to open in full size.
diyAudio Member
Posted in Uncategorized
Views 415 Comments 0 stripe157 is offline
Old

No more excuses...

Posted 20th July 2010 at 12:25 PM by wintermute (Wintermutes Rantings)
Updated 22nd July 2010 at 01:00 PM by wintermute (addition of progress picture.)

I think I must be afraid of failure. I still haven't built the YARPS power-supply I've mostly worked out the layout on verro-board, and I still have a number of components (not least of which is a transformer) to purchase. You would think that the three months I've been waiting for the silmics I could have got the rest organised... sigh...

The Synergy active crossover, I haven't even started on the layout for the YARPS is a prerequisite for powering it up, but once again, nothing stopping me from doing other stuff.

Today finally received the 14, 1000 uF elna silmic II's today that I ordered months ago. I need two for the PS output and the other 12 are destined for the Synergy (yeah I know WTF?) the current schematic doesn't show them but in a case of gross overkill they will be used for separating different sections of the circuit if I can fit them Basically they will be decoupling the various sections from the supply (and each other). 1 cap per...
Attached Thumbnails
Click image for larger version

Name:	series200.gif
Views:	1391
Size:	96.5 KB
ID:	189   Click image for larger version

Name:	DSC_5916.jpg
Views:	780
Size:	220.5 KB
ID:	190  
wintermute's Avatar
diyAudio Moderator
Posted in amplifiers, misc
Views 1688 Comments 0 wintermute is offline
Old

Link to my writeups, and other things...

Posted 19th July 2010 at 06:30 AM by wolf_teeth

Photobucket pages:
http://photobucket.com/Wolf-Speakers_and_more

My blog at PE:
http://techtalk.parts-express.com/blog.php?u=4102

This is not my main forum of visitation, so in case someone finds me here...
Wolf
wolf_teeth's Avatar
diyAudio Member
Posted in Uncategorized
Views 715 Comments 0 wolf_teeth is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 06:33 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