Finally, an affordable CD Transport: the Shigaclone story - Page 64 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 25th April 2008, 04:18 PM   #631
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by robot
What 'bout http://shop.technikdirekt.de/en/a-au...2/JVC+RC-EZ+55
?
Suitable or not?
This unit does not appear to be suitable as it supports MP3 cd playback which indicates a different chip set is used.

So far the only ones identified with the correct family of chips are the RCEZ31 which is still readily available in Europe and Canada, and the RCEZ32 which is a more complex version available in the USA and possibly elsewhere.

John has added the RCEZ51 to the list, one I have not seen personally, but has been mentioned. There is also a model by Alba that uses a version of this mechanism and the right chips. (See earlier postings for more info.)
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 25th April 2008, 04:21 PM   #632
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by MrMajestic


Ok, I will try that, thanks. Its a cheap Mastech by the way.
I'll keep my fingers crossed, but I do suspect the meter. I have a Fluke, and a Keithley 2002 as well as some cheap meters - the cheap ones all produce erroneous results when used the way you describe while the Fluke and Keithley do not.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 25th April 2008, 04:22 PM   #633
johnm is offline johnm  United Kingdom
diyAudio Member
 
johnm's Avatar
 
Join Date: Sep 2003
Location: Hampshire
...and don't forget the RC-EZ51!
  Reply With Quote
Old 25th April 2008, 04:35 PM   #634
johnm is offline johnm  United Kingdom
diyAudio Member
 
johnm's Avatar
 
Join Date: Sep 2003
Location: Hampshire
If one is using 75-ohm BNC connectors on the output of the JVC, and the input of the DAC, and a 75-ohm cable, do the 301/100 ohm resistors still need to be used at the output of the JVC or not?

(note: my DPA DAC has a 75-ohm resistor at its digital input also).

Ta,

- John
  Reply With Quote
Old 25th April 2008, 05:02 PM   #635
diyAudio Member
 
MrMajestic's Avatar
 
Join Date: May 2007
Quote:
Originally posted by kevinkr


I'll keep my fingers crossed, but I do suspect the meter. I have a Fluke, and a Keithley 2002 as well as some cheap meters - the cheap ones all produce erroneous results when used the way you describe while the Fluke and Keithley do not.
Wow, your trick worked. I put a 10uf cap between the probe and the measuring point and voila, no AC. It started off at the same reading but trickled down to close to zero. Thanks for your help, I will now start looking for a new multimeter
  Reply With Quote
Old 25th April 2008, 05:15 PM   #636
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by johnm
If one is using 75-ohm BNC connectors on the output of the JVC, and the input of the DAC, and a 75-ohm cable, do the 301/100 ohm resistors still need to be used at the output of the JVC or not?

(note: my DPA DAC has a 75-ohm resistor at its digital input also).

Ta,

- John
Yes, you need a 75 ohm source impedance to drive 75 ohm cable which in turn is terminated into 75 ohms. Properly implemented this will result in the lowest level of reflections.

The output of the LA78601 doesn't really want to see a 75 ohm load directly, because of limitations in the amount of current it can source it should ideally not see a load impedance much below 400 ohms - driving the dac with your current values you will be in the vicinity of 340 ohms which is a bit low but seems to work ok.

The original values I recommended of 392 and 93 ohms actually meet all of the criteria in this regard. (But I think 301/100 is probably ok long term.)
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 25th April 2008, 05:19 PM   #637
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by MrMajestic


Wow, your trick worked. I put a 10uf cap between the probe and the measuring point and voila, no AC. It started off at the same reading but trickled down to close to zero. Thanks for your help, I will now start looking for a new multimeter
Glad to hear it. An inexpensive Fluke is a good investment as would be any inexpensive good quality scope you could score. (Kikusui, Tektronix, Philips.)
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 25th April 2008, 06:08 PM   #638
Badge is offline Badge  United States
diyAudio Member
 
Join Date: May 2004
Location: Oregon
How do you remove the cd damper from the lid?
__________________
The freaks stick together, they are a tight old crew
  Reply With Quote
Old 25th April 2008, 06:21 PM   #639
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
Badge. If it is the EZ31, then you unscrew the small screws on the puck bracket.
  Reply With Quote
Old 25th April 2008, 06:39 PM   #640
Badge is offline Badge  United States
diyAudio Member
 
Join Date: May 2004
Location: Oregon
Thanks Puffin. I was so myopic just looking at the puck itself
__________________
The freaks stick together, they are a tight old crew
  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



New To Site? Need Help?

All times are GMT. The time now is 10:48 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