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

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Arcam CD72 Output Stage
Arcam CD72 Output Stage
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
Thread Tools Search this Thread
Old 6th August 2004, 03:51 PM   #1
senshu is offline senshu  Japan
diyAudio Member
Join Date: Aug 2004
Location: Tokyo
Default Arcam CD72 Output Stage

Dear diyAudio members,

I originally posted this message to hifichoice.co.uk (Arcam's country), and guy there suggested me my issue is sitable for diyaudio than hifichoice.

Now, I am modifying Arcam CD72 CD player, and would like to have some adivices from you. I am an almost pure software engineeer and is lacking a sense of electoric issue.

I did changed and added some of electrolytics, added power transformer for op-amp supply, and now I am facing how I can improve output stage including analog LPF.

Below URL is my CD72 modification history, still on going. Though all the texts are in Japanese, but you can see figures including circuit diagram.
I have a plan of translating this site nto English, but not so soon.

I checked Arcam's PCB and got their LPF/output circuit design as described in the 3rd picture in the below page.

I have four questions.
Q1) Does anyone know if this my circuit description is correct?
Q2) Due to avoid the interference of non-audible carrier frequencies from many sources at the mixing console, most of manufacturers, including Arcam, adopt very physically high performance LPF. But for most of listeners, just plug CDP to amplifier/speaker, I believe, such a physically good LPF is not required, or even is bad from signal purity perspective. Is this my understanding correct?
Q3) If my above understanding is correct or passable, what options are possible for modifying Arcam's LPF/outpit stage? Simply eliminating 1st OP-amp and use only CR filter can be one option, I think. Is anyone has any other good idea?
Q4) OP-amp. Original CD72 uses two NJM2114D dual channel amps. I already changed these to AD827JN and I personally love this over 2114. I am planning to use OPA627 for next step. Anyone has any better recommendation?

Your any comment or suggestion will be highly appreciated.
  Reply With Quote


Arcam CD72 Output StageHide 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
Arcam Alpha 1 amplifier (30w) (TIP2955 / TIP3055 output stage) ash_dac Solid State 32 14th February 2009 04:43 AM
Arcam CD72 CD player problem gg41r Solid State 4 13th February 2009 11:43 PM
Arcam Alpha 5 - no output Tyron Digital Source 29 11th November 2008 10:10 PM
Output stage biasing, with the driver stage andrew_whitham Tubes / Valves 0 19th May 2007 11:14 AM
Output coupling caps in Arcam Alpha 5 CDP filholder Digital Source 6 23rd June 2005 01:28 PM

New To Site? Need Help?

All times are GMT. The time now is 11:26 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio