How to add reclock in Philips CD303 - 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 17th December 2010, 02:35 AM   #1
diyAudio Member
 
Join Date: Apr 2006
Location: Taipei
Default How to add reclock in Philips CD303

Dear Sir
How to add reclock in Philips CD303?
Could anybody can teach me?
Thanks you very much!!
  Reply With Quote
Old 17th December 2010, 08:22 AM   #2
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Do you mean an aftermarket clock ?
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 19th January 2011, 12:28 PM   #3
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
hi,
I have Philips CD350 and interested in that too...
For instance, if to buy some aftermarket clock from ebay like this?
should a quartz simply be replaced by new clock + feed the clock with 6v?
  Reply With Quote
Old 22nd January 2011, 05:31 AM   #4
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Hi, First you should open up the machine and see what frequecy the crystal
is using for the laser decoder (SAA7XXX).For Philips it is commonly 16.934Mhz. but it can be another frequency depending on which model it is.

After you know the frequency then get the correct clock module,
of course the power suppy differ from one to another but generally it
is DC volts but the one you showed is 6V AC? If so depending on what
power voltage on your machine you can tap accordingly or modify/add another
transformer or DC rectification.

Follow the instructions provided with the clock module ( electrical connections) and you will have no problem. Hope this helps.
PS you may need to remove the caps connected to old crystal if instructed by the particular clock module.
You can download Philips cd303 service manual but it is in dutch language! The schematics is all you need.
Singa

Last edited by singa; 22nd January 2011 at 05:47 AM.
  Reply With Quote
Old 24th January 2011, 11:06 AM   #5
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
hi Singa,

many thanks! It appears to be quite simple
  Reply With Quote
Old 26th January 2011, 11:55 AM   #6
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
finally found the clock that seems to be quite decent for my Philips CD350

btw, could anyone pls advice which transformator is better to choose as clock's PS? should it be toroidal obligatory and what should be the min VA (10 or 20 or even higher?)
  Reply With Quote
Old 26th January 2011, 02:16 PM   #7
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
10VA is probably too much for the clock.

I do not think there is any difference between transformers, apart from mounting them.


Andy


.
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 27th January 2011, 01:46 AM   #8
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Quote:
Originally Posted by dtses View Post
finally found the clock that seems to be quite decent for my Philips CD350

btw, could anyone pls advice which transformator is better to choose as clock's PS? should it be toroidal obligatory and what should be the min VA (10 or 20 or even higher?)

Hi dtses,
That's a nice ocillator with 1ppm temperature compensated but
let's say we take it as face value the claim of 1ppm accuracy,you need a very
low noise power supply and the one on the pcb is well a standard one perhaps
better than a plain 3 pin regulator.Anyway you get what you pay for.

It's easy to calculate the VA (volt ampere or power in watts) needed for a transformer by using Ohm's law.You can check for a typical TXCO how much current it uses from the datasheet and the 74hc163 it would actually not be much.

So for illustration we use a figure of 100mA which is way in excess of the
true value.The input voltage needed by clock pcb as shown is from 7-20 volts
DC.For lowest noise pick a lower voltage,eg. 9V is commonly available.
(Assuming TXCO and 74hc163 are 5V rated.3V headroom for 3pin regulator.)

VA=current X voltage =100mA X 9V= 0.9VA ~ 1VA

Add some 10% or more for transformer losses and the common VA values
you will see in catalogues is from 2 ,3,4,5,6 etc. So closest will be 2VA.Even
a 3VA is no harm.Do not use one that is too big as the space available in the
cd player is limited.

PS as you can see it has a "frequency divider in 74hc163" ,if you are only using
16.934Mhz you tap from the stated take off solder pads and it is preferable to
cut the power trace to 74hc163 and reconnect from the output of TXCO removing one noise source in the 74hc163.(ie. not use the 74hc163).
If you don't feel confident about diy then use as is.
Singa.

Last edited by singa; 27th January 2011 at 01:48 AM.
  Reply With Quote
Old 27th January 2011, 11:57 AM   #9
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
Hello singa,

I really appreciate your explanation and help!

read somewhere in the web that toroidal transformers are slightly better to use for audio purposes, so probably will be looking for such as there is quite a lot of space in my CD350.

Frankly speaking I'm not a DIY expert, even more - this would be my first CD tuning, so I guess I will leave the clock module as it's now. Maybe later replace the caps with Elna or OSCONs...

Btw, just to confirm that clock module should be shielded, shouldn't it? and will a 1mm copper plate be enough for that?
  Reply With Quote
Old 29th January 2011, 09:29 AM   #10
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Quote:
Originally Posted by dtses View Post
Hello singa,

I really appreciate your explanation and help!

read somewhere in the web that toroidal transformers are slightly better to use for audio purposes, so probably will be looking for such as there is quite a lot of space in my CD350.

Frankly speaking I'm not a DIY expert, even more - this would be my first CD tuning, so I guess I will leave the clock module as it's now. Maybe later replace the caps with Elna or OSCONs...

Btw, just to confirm that clock module should be shielded, shouldn't it? and will a 1mm copper plate be enough for that?
Hi dtses,
Take care not to over tighten the bolt of the toriod but if you are
using a molded or encapsulated toriod then this is not an issue as there are
tabs for the holes.I don't think it is critical to shield the clock pcb as you may accidentally make contact with some part and shorting the circuit.If this is an instrumentation equipment ,it may be wise to shield as you want to make accurate or precise measurements.A copper plate alone will not give
proper or adequate shielding as the radiation can go over or around .
Fully enclosed is better but a hassle ( the clock pcb ) but that does not mean you can't use it if there is space to install, better than no barrier?. Singa
  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
CDM1 and philips cd303 elperopu Digital Source 25 6th February 2013 12:25 PM
Philips cd303 dariusku Digital Source 2 3rd October 2009 05:32 AM
Philips cd303 vkneze13 Digital Source 2 2nd October 2009 09:38 PM
I've murdered my Philips CD303! suddy Digital Source 9 2nd October 2009 09:35 PM
help!i need a manual of philips cd303! falcon4 Digital Source 8 2nd October 2009 09:29 PM


New To Site? Need Help?

All times are GMT. The time now is 06:18 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