We have a beautiful circuit diagram and the Thuring boards have been ordered. It is time to worry about the components we need for this project! Today, we will take care of the quartz.
NYMPH quartz disassembled. Photo 8 – DP 124
Lumpert opened a catalogue from SARONIX and noticed the NYP 041 12. That quartz operates at about 4 MHz and that is just the frequency he needs.
Lumpert ordered 20 quartz from COMPONA AG (A retailer of the SARONIX NYMPH quartz) on 13 August 1985. You may remember that he had ordered 20 boards from Thuring on the very same day.
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Later on, on 8 November 1985, he will order 15 identical quartz from the same company.
Notice that the invoices and the catalogue give the frequency of the quartz as 4.194303 MHz. But look again at the picture of the timer “found” in Togo!
PHOTO 4 – DP 124
The quartz is clearly labelled 4.194304. What is going on?
And keep in mind that Lumpert had clearly written 4.194304 on the circuit diagram he had just designed.
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That looks like a misprint in the Compona catalogue. Someone must have hit the wrong key while typing in all those numbers. Saronix didn’t supply a 4.194303 MHz crystal, only one at 4.194304 MHz:
Click to access datasheet_nymph.pdf
There’s a good reason why they made a crystal at exactly 4.194304 MHz. As you explained on another page, if an oscillator signal at that frequency is divided by 2 repeatedly, 22 times, it produces one pulse every second (because 2 to the power of 22 = 4194304).
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http://www.lockerbie.ch
The following puls calculation for crystal: 4.4194304 Mhz, is correct and was the same as by the crystal: NYP 041-12, 4.194303 (delivered 1985, from COMPONA AG, to MEBO Ltd) – but the quartz was marked wrong, by error with number : 4.194303 MHz….
There’s a good reason why they made a crystal at exactly 4.194304 MHz. As you explained on another page, if an oscillator signal at that frequency is divided by 2 repeatedly, 22 times, it produces one pulse every second (because 2 to the power of 22 = 4194304)
by Edwin Bollier, MEBO Ltd
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