Paradise Builders - Page 50 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 11th December 2012, 09:14 AM   #491
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
thank you... will do
__________________
RC
  Reply With Quote
Old 11th December 2012, 09:54 AM   #492
beetle is offline beetle  Germany
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by FdW View Post
Show me (one more time) a full set of voltages test-points, Vin and Vout. Also would you measure all Vak(LED's) in the CVS and the CCS and, V(be) power and small signal transistors. It seems that the PSU is working but I want to know (at a philosophical level) why it is (as it is). This will make it easier to help other people.

P.s. The MJE's should be good, also the TIP's and the D44/D45's, but the D44/D45 where my first choice
Ok here we go:

TP101: 19.93V
TP102: 18.23V
TP103: 23.83V
TP104: 562mV
V(in)=29.88V@174mA

V(L110): 1.90V
V(L111): 1.90V
V(L112): 1.91V


V(BE Q101): 607mV
V(BE Q102): 347mV
V(BE Q103): 7.34V
V(BE Q104): 1.24V



TP201: -19.68V
TP202: -18.21V
TP203: -23.71V
TP204: -571mV
V(in)=-29.84V@151mA

Last edited by beetle; 11th December 2012 at 10:18 AM.
  Reply With Quote
Old 11th December 2012, 09:58 AM   #493
diyAudio Member
 
Benedetto's Avatar
 
Join Date: Nov 2007
Location: Knifetown-Germoney
Quote:
Originally Posted by FdW View Post
If not what?
The resistors wont be changed,
is there a known issue ?
__________________
preregulatorpeterE-MAIL
  Reply With Quote
Old 11th December 2012, 10:23 AM   #494
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by FdW View Post
If not what?
A picture tells more than a thousand words, so here is a picture.

The voltage (Vgs) of the mosfet is about 4V, the current that is (selected by me) wanted in the Jfet is 1mA. The picture shows resistor values for popular Jfet's to accomplice this (1mA). What can be seen is that, in fact, the J310 is the most marginal of the shown Jfet's (it is just capable of supplying the wanted 1mA).

Any of the Jfet's shown can be used (and I am sure there are many more) but you need to change the resistor value and indicated.
Attached Images
File Type: png Capture.PNG (35.3 KB, 273 views)
  Reply With Quote
Old 11th December 2012, 10:29 AM   #495
diyAudio Member
 
Benedetto's Avatar
 
Join Date: Nov 2007
Location: Knifetown-Germoney
Ive asked this rather stupid question because in the GB mine,
and many other sets delivered, contained only the alternative
fets....
__________________
preregulatorpeterE-MAIL
  Reply With Quote
Old 11th December 2012, 10:30 AM   #496
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by beetle View Post
Ok here we go:

TP101: 19.93V
TP102: 18.23V
TP103: 23.83V
TP104: 562mV
V(in)=29.88V@174mA

V(L110): 1.90V
V(L111): 1.90V
V(L112): 1.91V


V(BE Q101): 607mV
V(BE Q102): 347mV
V(BE Q103): 7.34V
V(BE Q104): 1.24V



TP201: -19.68V
TP202: -18.21V
TP203: -23.71V
TP204: -571mV
V(in)=-29.84V@151mA
I will, tonight, have a look at them. At first glance it seems the V(be Q102) is a bit low, and that this is debit of the current unbalance.
  Reply With Quote
Old 11th December 2012, 12:39 PM   #497
diyAudio Member
 
Join Date: Apr 2008
I am new to transistor matching so the question might be silly, but would a device such as the following be useful?

Found at Reichelt: ATLAS DCA55

Your feedback will be appreciated - thx.

dubai2000
  Reply With Quote
Old 11th December 2012, 12:56 PM   #498
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Quote:
Originally Posted by dubai2000 View Post
I am new to transistor matching so the question might be silly, but would a device such as the following be useful?

Found at Reichelt: ATLAS DCA55

Your feedback will be appreciated - thx.

dubai2000
checked it out - very nice. I am tempted to buy one myself.... It will do not only bipolar but also JFETs and other stuff....

In fact, matchign the gain devices makes a hell of a difference for audio amplifiers, as compared to just sticking in whatever comes out of the bag first. Many higher-performance (non-feedback) circuits really only work with selected / matched devices.
  Reply With Quote
Old 11th December 2012, 01:15 PM   #499
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I use it all the time. Buy it.
  Reply With Quote
Old 11th December 2012, 01:40 PM   #500
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Watch only that the Atlas does shove much Ib with a CCS inside, so the reported Vbe will be more than usual in circuit. But if they match @ that condition they do follow with other bias states more or less. Good thing is it tests LEDS in a much more real life 3.5mA than the proverbial 1mA that meters do. Many don't even put out enough voltage to light an LED to start with. What Vf matches on my Atlas matches on my F87V too, but when looking to use them as voltage ref you need to know not only matching but Vf @ bias current too. Ah, and Atlas is a battery hog.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Paradise phono stage hesener Group Buys 1315 11th August 2014 10:37 PM
DIY Paradise - Any good to buy from? gingerpimp0069 Vendor's Bazaar 7 21st June 2007 02:07 PM
DIY Paradise Charlize Jolojl Swap Meet 7 7th December 2006 06:42 AM
Diy Paradise! alexmoose Tubes / Valves 3 24th July 2006 04:37 AM
Another way to paradise ? Bernhard Pass Labs 3 8th August 2003 10:19 PM


New To Site? Need Help?

All times are GMT. The time now is 09:06 PM.


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