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Old 13th October 2006, 05:49 AM   #21
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Default battrey power

hi all i am going to run the clock off a 12 volt battrey today i will
connect the live to pin 1 of the 7805 reg. i remember that when i done this to a trichord clock 2 it was a big improvement a lot more clarity was the result i will let you know my findings later today
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Old 14th October 2006, 08:12 AM   #22
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Default what's gan on

what's gan on i got nothing would not work at all ? i Connected the 12 volt + to pin 1 and earthed it to the case never worked anyone know why hellllllllllllp
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Old 15th October 2006, 11:09 PM   #23
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Default Re: what's gan on

Quote:
Originally posted by whats gan on
what's gan on i got nothing would not work at all ? i Connected the 12 volt + to pin 1 and earthed it to the case never worked anyone know why hellllllllllllp
From your description it's not exactly clear what you did and I don't want to patronise you by asking things like 'did you remove the reg from the circuit board to do this?'

A picture of your setup would be great but otherwise a step by step account of what you did would be great.

I'm sure it can be sorted out.
Cheers.
__________________
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Old 16th October 2006, 08:47 AM   #24
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Default Cd4se

HI the 5 v voltage reg was in place with the first pin taken away from the curcuit board then i connected 12 volts dc ,which was fed by battery. normally the reg would take it down to 5 volts so it would work the clock i have done this in the past with power supplies but not a battery. though i have ran a clock 2 from a battery it must be a earth issue or any thing else i have not a clue thanks for you reply sorry i did try to atacha a pic the file is to big sorry the reg is u 14 on the board
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Old 18th October 2006, 12:03 AM   #25
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Default Re: cd 4se kills marantz with clock and audio upgrades

Quote:
Originally posted by whats gan on
the marantz is a very clean sound which sounds thin compared to the cd4se the vocals are fuller warmer instruments sound very real
Sounds like your mate might have chokes in his CD63 at R613-R616. These are between the +/- 12v regulators and the opamps, showing them a couple Ohms of power supply impedence, thus starving them for power. I used a ferite beaded jumper in mine instead.
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Old 6th February 2007, 06:54 PM   #26
anodyne is offline anodyne  United Kingdom
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Default Thundery CD4SE

Sorry to break into this thread but the forum won't let me post a new one after searching. Please forgive me and read on !
My well-liked Cambridge CD4SE has begun making spitty thunderous noises after working normally for about 40 minutes. Can anyone please tell me if there is a component in it that is known to fail after some years with this effect ? Also I notice there's loads of spare space in the case. Is there anything useful that could be fitted in in ? Many TIA.
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Old 6th February 2007, 08:29 PM   #27
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Hi Anodyne,
I've never heard any sound from a CD player described as spitty and thunderous!! Sounds impressive!
Does it still play discs while making this noise? Is it a sound from the speakers (unlikely) or mechanical noise from the player itself?
More details on the fault would be helpful.
I could only guess at this stage that it may be a dodgy motor.

The most common failures of players of this age are usually lasers and motors. 7 - 9 years ain't bad going for a laser.
New lasers are about 22 quid from Dalbani.

Is the noise a clicking, a rhythmical rubbing, or loud whirring?
I know it's not that easy to describe.

What to do with all that space............................................

Quote:
Originally posted by JohnW
John,

The best upgrade is to replace the AD711 OPAMP with a discrete design, this will give the greatest improvement, I would do this first before adding new regulators.

JohnW
John Westlake (JohnW) is the designer this player so he should know!! I have toyed with the idea of adding a tube output stage but I think I'll try the discrete transistor output that John is suggesting. This may well require, or at least benefit from, another power supply to give the +/- 12 to 25 volts needed for various designs.
I've just invested some money in breadboarding kit and will soon try out some designs.

Have you seen the Marantz mods thread? It's huge!!! Some people over there have separated their digital, analogue and servo supplies by adding more transformers (Power supplies). This could be done internally if you're up to the job.

Cheers,
Martin.
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Old 8th February 2007, 07:37 PM   #28
anodyne is offline anodyne  United Kingdom
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Hi Martin,
Thanks very much for responding. It's a quite scary sound from the speakers which mostly but not completely masks the music. It doesn't occur when using another source, even after a couple of hours.
From what you say I think I'll replace the laser and see what happens - or doesn't !
Not much point in upgrading until solved, but thanks very much for the pointer.
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Old 8th February 2007, 08:08 PM   #29
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Hi Anode. Try to remain positive
I think you should wait for a second opinion on this from someone a bit more knowledgeable than me before spending the money on a laser. However, it would probably only harm your wallet to do so and it would eliminate one possibility. I'll leave that up to you.

I've never really experienced this kind of thunderous noise from the speakers myself. A bad laser can sometimes make the sound from the speakers seem extremely choppy and fragmented. Is that what you mean?
There are people here who may recognise the problem if you try a little harder to describe it. You reap what you sow around here. My concern is that it may be a problem on the circuit board itself.

Does it happen straight away when you switch on from cold?
Does it work if you leave it switched on for some time before playing?
Does it happen every time and all CD's?
Can you quickly scan to the last few tracks of the disc and does this help?
Have you tried it on a full moon?

The experts around here (not me) are like detectives. They need clues.
You may even hear from JohnW himself.

Cheers,
Martin.
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Old 10th February 2007, 07:32 PM   #30
anodyne is offline anodyne  United Kingdom
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Hi Martin,

Can't really add much to original post: the CDP "...has begun making spitty thunderous noises after working normally for about 40 minutes".

It never does it from cold, doesn't do it every time I play a CD (even the same one), the noise is definitely a superfluous noise rather than something chopping up the signal, and I haven't tried it at full moon but it has snowed recently.

Will try skipping tracks but I'm sure it's not a faulty or dirty CD.
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