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Old 28th December 2011, 11:18 PM   #401
Mayday is offline Mayday  Sweden
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I'll look into those schematics
Might not be necessary for the SAA7220, but those followed by a TPR could be a nice supply for a clock.
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Old 29th December 2011, 04:56 PM   #402
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Arrived today, extremely well packaged incl. ESD-protection.
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Old 29th December 2011, 07:09 PM   #403
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Quote:
Originally Posted by Mayday View Post
I'll look into those schematics
Might not be necessary for the SAA7220, but those followed by a TPR could be a nice supply for a clock.
The whole of the Teradac clock is the power supply except the oscillator and the counter chip!
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Old 29th December 2011, 08:04 PM   #404
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I didn't mean the Clock I've bought, I ment for just an oscillator if I needed to build a cheap Clock sometime.
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Old 29th December 2011, 09:11 PM   #405
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If you can build one as good and cheaper than this ( and it has to work btw ) I'll buy one off you !!
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Old 29th December 2011, 09:14 PM   #406
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They didn't send me a free BIC lighter either...
I'm going to complain and get a refund
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Old 29th December 2011, 09:20 PM   #407
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If you can build one as good and cheaper than this ( and it has to work btw ) I'll buy one off you !!
Probably not as good no
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Old 29th December 2011, 09:21 PM   #408
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They didn't send me a free BIC lighter either...
I'm going to complain and get a refund
You didn't!?! That's the new high-end BIC too!
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Old 29th December 2011, 10:13 PM   #409
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hold on guys, what do you think most of the commercial clocks are?

You start with an accurate and stable oscillator ideally under 25ppm stability and you build the quietest PSU you can to power it with! That's it! well near enough!

The problem comes trying to obtain the oscillators. A lot of new stuff uses 24.576Mhz which seem to be available via RS in the UK. The other common frequencies 16.934Mhz and 11.2896 are not. The main problem with the Chinese clock is they use basic regulation and unknown oscillators.

You will definitely improve on that clock if you power the oscillator and counter chip from a TPR. The only problem you may have is that the oscillator may be 3.3v and the chip may be 5v.
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Old 29th December 2011, 11:08 PM   #410
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I was more thinking if I wanted do a basic clock upgrade for a friend or something.
I could then, I guess, use the TPR which is rather cheap to build and then simply hook it up to either existing oscillator or buying a better(?) cheap 1ppm oscillator of ebay?

Or am I completely stumbling around blind here?

On another subject, I've just glanced through the thread where Andrew did a "grundig" advanced DEM re-clock.

If I take 11.2896 from Valab clock to SAA7220 pin11, SAA7310-C pin28, /2 to to TDA1541A pin2 & pin4.
Lift pin9 on SAA7220 and I guess pin28 on SAA7310(by lifting closest component).
I then, assuming I'm right above, have to cut signal to Pin2 & Pin4 on TDA1541A from SAA7220..how?

I'm rather tired, and on painkillers for my ankle lol, but am I atleast close?
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