series clock for cds - is it new?

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padamiecki

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Joined 2004
#1
Hello

Like Elso I am a chemist, but oposite I am weak in digital.

Please comment of a chematic of a clock that I found on some Polish site.
As I have read from a description, the oscillator is sonnected in series, not paralled like in most application.
The clock is very stable and its drift during a year was 0.
It could work as "slave" and might be steering from indepentent voltage sources or PLL.
To work as cd clock we have to ommit R5,6,7,8,C9,D1.
D1 should be replaced with a fixed capacitor.

Here is the link: http://stud.wsi.edu.pl/~sikrolb/schematy-stabilny_oscylator.html
 
#2
This is a series resonance oscillator. I have used this circuit (very simlilar) for a digital clock (on the wall) and the frequency was 4.194 MHz.

If you are going to use such oscillator note that the crystal must be made for this operating mode because the stability gets really bad if you tune a parallel crystal to series resonance, ie 4 MHz parallel tuned to 4 MHz series.
 
#3
Can you explain why stability goes bad when using a parallel crystal in series mode?

I'm reading Hans Camenzind's book (http://www.designinganalogchips.com/) and at page 158 he mentios series and parallel resonnance modes for a quartz.
He didn't precise that crystals are made or either one or the other mode, just that both are 0.2% apart.

BTW, in our (unmodded) cd players, is the classical cmos inverter/crystal combo a series or a parallel oscillator?


Mr Camenzind also proposes an optimized cmos oscillator, with a series resistance (more details about this in his great (and free!) book) has anyone tried it?
 
#4
peranders said:
This is a series resonance oscillator. I have used this circuit (very simlilar) for a digital clock (on the wall) and the frequency was 4.194 MHz.

If you are going to use such oscillator note that the crystal must be made for this operating mode because the stability gets really bad if you tune a parallel crystal to series resonance, ie 4 MHz parallel tuned to 4 MHz series.
Click to expand...


This means that for my Philips CD I have to use 11,28....MHz quartz?
 
#5
peranders said:
This is a series resonance oscillator. I have used this circuit (very simlilar) for a digital clock (on the wall) and the frequency was 4.194 MHz.

If you are going to use such oscillator note that the crystal must be made for this operating mode because the stability gets really bad if you tune a parallel crystal to series resonance, ie 4 MHz parallel tuned to 4 MHz series.
Click to expand...


... and series method realy gives more stable frq than parallel?
 
#10
Crystal Oscillator

Hi padamiecki,
The circuit pictured is from the Elektor magazine. It is a Buttler oscillator if I am not mistaken.. This type of oscilator has certain advantages at very high frequencies like 100MHz. I tried all kind of oscillator circuits and found the Colpits the best though the differences are not big.
I found that a FET gave better results but the circuit could be modfied so.

Per-Anders you are completely wrong. There is no fundamental difference between a series and parallel resonant crystal. The only difference is the way it is calibrated. A series resonance specified crystal will oscillate at a slightly different frequency in a parallel resonant circuit like my clock.
Looks like you never studied the papers you promised to send me a year ago but never did.......🙄 🙄 🙄 🙄
 
#12
Re: Crystal Oscillator

Elso Kwak said:
Per-Anders you are completely wrong. There is no fundamental difference between a series and parallel resonant crystal. The only difference is the way it is calibrated.
Click to expand...
Elso, I didn't say that the crystal is different physically and you are right the frequency calibration is different 0.2% between those two types. It's the same crystal.

Elso Kwak said:
Looks like you never studied the papers you promised to send me a year ago but never did......
Click to expand...
I'm afraid that I haven't got any urge anymore to give you anything. Later maybe but an attitude change is necessary.
 
#13
Re: Attitude change, eh?

I'm going back to my cave.
Click to expand...

I see that some person here (except Bricolo) cannot and do not want understand other, but for their agreement is missing only ~0,2%. What a pity. This is the way why the wars begin, but "the devil sleeps in details".
Besides this is none of my business even if the hate is destructive feeling...

Anyway, is there anybody who will advice how to rebuild this circuit with fets and tune it on 112896 MHz?
 
#14
Re: Re: Attitude change, eh?

padamiecki said:
Anyway, is there anybody who will advice how to rebuild this circuit with fets and tune it on 112896 MHz?
Click to expand...

Hi padamiecki,
The circuit you are referring to was posted on this forum before about three years ago. I then advised to build my circuit as it is more simple, better and does not need tuning. So I advise the same again. You can download it here:
http://www.diyaudio.com/forums/showthread.php?postid=199928#post199928
Best regards,
ELSO
 
#15
Re: Re: Attitude change, eh?

padamiecki said:
Anyway, is there anybody who will advice how to rebuild this circuit with fets and tune it on 112896 MHz?
Click to expand...
If this is for a CD clock 0.2% is pretty unimportant (not if you have a clock on the wall!) so you can use this type of circuit and you can get rid of all overtone stuff and tuning stuff... or you can buy Elso's pcb.... which he is happily selling to you.
 
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