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

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

UGS MUSES Scion Preamplifier.
UGS MUSES Scion Preamplifier.
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
Reply
 
Thread Tools Search this Thread
Old 13th August 2019, 03:22 PM   #101
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
Quote:
same calculus for inner ring of current mirror bjts - Q5,6,7,8 - same Iq as previous , figure out CE voltages for dissipation calculus
Maximum voltage swing is 25V peak-to-peak, that as +12,5V and -12,5V.

The core is the SuSy, the rest is interpretation just like the paralleled version which N.Pass liked. (see attachment)

I have no clue on the differences in sound, but no matter, it will be the best I've ever owned
Attached Images
File Type: png cugs_v0.1.png (18.6 KB, 214 views)
  Reply With Quote
Old 13th August 2019, 03:26 PM   #102
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
UGS MUSES Scion Preamplifier.
try harder ..... when dealing with technical things , being precise is beneficial .....

so , define CE voltage for each bjt , write it down , do dissipation calc - both static and peak

you don't need doing that for me ......

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 13th August 2019, 03:35 PM   #103
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
I will need to go over all the notes and do sim. Remember, I have no idea what I'm doing, I'm a n00b, so steep learning curve here.

The BC850/860 has a Pd of 310mW which I am sure is more than adequate. The [hfe] target is a different story. I know the recommendation is more than 100, but HOW much more.
  Reply With Quote
Old 13th August 2019, 04:05 PM   #104
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
UGS MUSES Scion Preamplifier.
I did told you - ignore Hfe
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 13th August 2019, 04:26 PM   #105
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
But ideally you want the FETs to be matched, it is a mantra repeated over and over when you read about these things. Hfe on the other hand, well... I will investigate it a bit further. I just wana make sure that everything is done properly. If that mean 1% or 13% or whatever, that I don't know. But it can't harm to match
  Reply With Quote
Old 13th August 2019, 06:31 PM   #106
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
Two places that sell the SOT-23 version. Both of them can deliver the LSJ74B if you send them an email.

US; LSK170B SOT-23 3L | Linear Integrated Systems | Trendsetter Electronics
Europe: Micross Components Ecommerce System

Oneminde
  Reply With Quote
Old 13th August 2019, 06:58 PM   #107
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
Attached Images
File Type: jpg BC850B_860B.jpg (508.5 KB, 187 views)

Last edited by Oneminde; 13th August 2019 at 07:13 PM.
  Reply With Quote
Old 13th August 2019, 09:55 PM   #108
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
One of the reasons I am doing this project - besides the volume wheel - is my passion for loudspeakers. That too has been a long journey but I am finally ready to start prototyping soon. So when the need for a really nice stereo system became a serious task, I knew I had to find something fully capable of delivering effortless rendition of music. In case anyone wonder if I had more reasons than electronics and music, here is a picture of the concept rendition for 1 of 2 2-way's which is part of a series of loudspeakers.

Oneminde
Attached Images
File Type: jpg 6624628840922611712_n.jpg (200.2 KB, 171 views)
  Reply With Quote
Old 14th August 2019, 01:31 AM   #109
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
Nelson Pass on learning his craft, then starting Threshold, Pass Labs, First Watt.
YouTube
  Reply With Quote
Old 14th August 2019, 07:46 PM   #110
Oneminde is offline Oneminde  Sweden
diyAudio Member
 
Join Date: Jun 2014
Location: Darkside of the moon.
Default Important question.

I was inspecting the motherboard sch and found something that I can't understand. So maybe someone can jump in an explain.

In the MUSES 72320 datasheet, pin 8 & 9, labeled DCCAP_L/DCCAP_R (Switching Noise Rejection Capacitor) has a 100uF capacitor in place in all of their test and example circuits.
Checking the UGS MUSES sch, pin 8 & 9 is pulled to gnd via 0 ohm resistor.

Why does the schematic not use a capacitor but rather a resistor ?

(see attached image)
Attached Images
File Type: jpg ugs_muses_p8_p9_question.jpg (298.2 KB, 130 views)
  Reply With Quote

Reply


UGS MUSES Scion Preamplifier.Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Muses Volume meldano Swap Meet 127 14th July 2019 02:18 PM
Muses Volume Attenuator Kit meldano Swap Meet 11 6th July 2017 08:33 PM
Muses Volume Kit meldano Swap Meet 7 20th March 2017 02:39 PM
Help for MUSES 72320 DIY kit touchdown Analog Line Level 8 23rd December 2013 11:21 AM
how much is to much power for a 04 scion xa? glfooks91 Car Audio 3 23rd January 2008 12:18 AM


New To Site? Need Help?

All times are GMT. The time now is 01:44 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki