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Post by hifijunkie on Jul 17, 2009 15:38:15 GMT
Guys, can anyone help me in mating the low jitter clock in the MHZS CD33 ??
I don't know where to take the voltage from .
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leo
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Post by leo on Jul 17, 2009 20:21:17 GMT
I do not know this clock or know its input voltage requirement
I built a little linear regulated supply for the clock I used but you should be able to tap into the raw supply of the CDP from the input of one of the regulators
If the raw supply is too high just tap into the output of the reg, you have around three regs to choose from depending on voltage requirement for that clock
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insomniac
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Post by insomniac on Jul 17, 2009 22:08:17 GMT
The Audio-gd JZ1 needs a supply voltage between 10 - 30v DC. Did you get the card sorted?  |
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Post by hifijunkie on Jul 18, 2009 6:07:42 GMT
What card are you talking about ??
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Post by hifijunkie on Jul 26, 2009 6:13:19 GMT
i have connected the clock but i don't hear any improvement in sound whatsoever ..... I have taken voltage from on of the inputs to the regulators , so the voltage is not regulated. As per Kingwa, the seller, regulation is not required because the JZ1 already has very good regulator.....
At the end of the day this clock simply does not work in my MHZS CD33F
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robertkd
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Post by robertkd on Jul 26, 2009 10:23:43 GMT
my question would be,..
what exactly would you expect to be different given that the unit is a CD player so can only resolve a fundamental 44.1Ks stream?
Robert
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insomniac
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Post by insomniac on Jul 26, 2009 18:10:54 GMT
i have connected the clock but i don't hear any improvement in sound whatsoever ..... I have taken voltage from on of the inputs to the regulators , so the voltage is not regulated. As per Kingwa, the seller, regulation is not required because the JZ1 already has very good regulator..... At the end of the day this clock simply does not work in my MHZS CD33F What length is the clock signal cable? it must be kept as short as possible. The module requires burn-in before reaching full performance so give it some time. Can you post a photo of your CD33F with JZ1 fitted? |
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leo
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Post by leo on Jul 26, 2009 21:20:41 GMT
The advantages from an upgraded clock module comes mainly from the better regulation rather than the fancy arsed looking oscillator , if the regulation used is better than LM317 type at rejecting high frequency crap you should get an audible improvement.
The oscillator used in the CD33 isn't too bad, the problem is its voltage comes from regulation sharing other circuits including things which inject more crap onto the lines
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Deleted
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Post by Deleted on Jul 26, 2009 22:36:48 GMT
Leo is spot on.Provided that the oscillator doesn't use a simple 2 pin Xtal, the main improvement will come from a cleaner regulated supply to the oscillator. There may very well be an improvement in this particular implementation, but these differences aren't usually clearly audible unless the rest of the electronics is also top notch. The more transparent the rest of the system is,(including the rest of the DAC) the more obvious these small changes become.
SandyK
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Post by hifijunkie on Jul 27, 2009 16:23:50 GMT
Yes Leo, that is exactly whyi bought this clock. I got to know this after reading your posts in your other thread about this CDP. Voltage regulation is what i thought would be the mainstay of this or any clock . The oscillator itself is the same as the original old one.
Kingwa asked me to remove the Ground wire at the power input side and still i can't hear any improvement. Next step is probably to build a separate PSU for JZ1. It would be great if you can provide the circuit diagram of the PSU you build for your CD33. I have all the parts readily available, i just need a proven design
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Post by hifijunkie on Jul 27, 2009 16:26:45 GMT
Here is the pic of the installed JZ1 in my CD33. Please note that the 'Ground' wire the voltage supply end is now removed. I have taken 13V from one of the regulators.  |
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leo
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Post by leo on Jul 27, 2009 20:06:40 GMT
Try and shorten the wires from the output of the clock to CDP pcb, if you must keep them long I'd use a shielded co-ax, remember longer unshielded cable acts as an aerial, something you certainly do not want with this circuit  try to keep the wire away from those black ribbon cables The psu I built was totally standard stuff, the main advantage is that its separate/isolated from the other circuitry I just used a small 15v transformer, rectifier made from schottkies, 2200uf 63v panasonic FC , thats it! This fed the new clock board containing a VBE+ Jung type circuit supplying the original oscillator I have higher raw DC supplying the VBE because of the voltage drop you get with capacitor multipliers Theres a lot of mods you can do to this cdp but most are quite complicated and not easy to explain |
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insomniac
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Post by insomniac on Jul 27, 2009 20:29:44 GMT
Some good advice there from Leo.
You could shorten those clock signal and ground wires by about half their length going from the photo. As mentioned, much better with some coax or if you haven't got any try shortening and twisting the wires together to form a pair similar to the power cables.
I must mention again the burn-in factor. If possible, try to leave the CD Player switched on 24/7 for a couple of weeks. No need to listen to music the whole time or play a disc on repeat as the JZ1 should be running and burning-in even when no disc is playing.
Many of the clock upgrade manufacturers offer similar advice regarding burn-in of a new module.
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Post by hifijunkie on Jul 28, 2009 10:12:19 GMT
Leo, i am quite new to this electronics  , It would be great if you show a diagram of all the components and how they are connected. Please let me know if you have any better design then the one you created. I will shorten the wire today and this weekend i am off to bazaar to look for co-axial cable. btw, what is the correct procedure for installing that cable ?? Is it the center wire the clock signal and the outer wire is the ground ?? or two separate wires with outer wire connected to earthing ? |
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Post by hifijunkie on Jul 28, 2009 10:15:35 GMT
The CDP is switched on since 5 days 24/7 . I will keep it on all the time till i hear some improvement |
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leo
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Post by leo on Jul 29, 2009 19:20:19 GMT
Leo, i am quite new to this electronics , It would be great if you show a diagram of all the components and how they are connected. Please let me know if you have any better design then the one you created. I will shorten the wire today and this weekend i am off to bazaar to look for co-axial cable. btw, what is the correct procedure for installing that cable ?? Is it the center wire the clock signal and the outer wire is the ground ?? or two separate wires with outer wire connected to earthing ? This is all I use, it was knocked up from whatever bits I had spare. For the clock I use its adequate , the clock board contains its own VBE, super reg so anything more than a basic raw supply would be a waste. (the main thing is its separate) I don't know the clock you use so can't comment if its onboard regulation is sufficient at filtering for a raw DC supply, if it offers very good filtering etc you should be ok  For the co-ax, use centre core as + and the shield as Gnd |
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try to keep the wire away from those black ribbon cables
, It would be great if you show a diagram of all the components and how they are connected. Please let me know if you have any better design then the one you created.