The pre-amp uses two NE5532 low-noise integrated circuits
https://www.banggood.com/NE5532-OP-AMP-HIFI-Amplifier-Preamplifier-Volume-Tone-Control-Board-p-1098533.html?rmmds=search&cur_warehouse=CN
Monday, 16 December 2019
Headphone amplifier
The headphone amplifier with VU-meters almost finished:
https://www.banggood.com/NE5532-OP-AMP-HIFI-Amplifier-Preamplifier-Volume-Tone-Control-Board-p-1098533.html?rmmds=search&cur_warehouse=CN
https://www.banggood.com/NE5532-OP-AMP-HIFI-Amplifier-Preamplifier-Volume-Tone-Control-Board-p-1098533.html?rmmds=search&cur_warehouse=CN
Tuesday, 10 December 2019
Garden - Flora
Garden - Flora
In order to observe the changes through the seasons in my garden I intend to gather photo's here.
An overview of my garden:
1. Zomereik / Quercus Robur
2. Sneeuwbal / Vurbarnum Opulus
3. Vijver / Pond
4. Grove den / Pinus sylvestris
5. Vijf
6. Esdoorn / Acer
7. Winterharde palm / Trachycarpus fortunei
8. Appelboom / Apple tree / Malus domestica
9. Appelboom / Apple tree / Malus domestica
In order to observe the changes through the seasons in my garden I intend to gather photo's here.
An overview of my garden:
1. Zomereik / Quercus Robur
May 2020
May 2020
2. Sneeuwbal / Vurbarnum Opulus
May 2020
May 2020
3. Vijver / Pond
May 2020, Gele Lis/Iris pseudacorus
17 May 2020
4. Grove den / Pinus sylvestris
May 2020
Dennenappels / Pinecones
5. Vijf
6. Esdoorn / Acer
May 2020
7. Winterharde palm / Trachycarpus fortunei
May 2020
May 2020
8. Appelboom / Apple tree / Malus domestica
June 2020
9. Appelboom / Apple tree / Malus domestica
January 2021
10. Perenboom / Pear tree
May 2020
July 2020
11. Appelboom / Apple tree / Malus domestica
12. Pruimenboom / Prunus domestica
July 2020
Close-up
13. Appelboom / Apple tree
July 2020
14. Ligusturhaag / Ligustrum Ovalifolium
May 2020
15. Ruwe Berk / Birch / Betula Pendula
November 2020
16. Zestien
17. Zeventien
18. Achttien
19. (Witte) trosroos / Rosa Maria Mathilda
May 2020
20. Buxus
May 2020
21. Kas / Greenhouse
May 2020
22. Tweeentwintig23. Eikenbladhortensia / Hydrangeaceae
August 2020
24. Sneeuwklokje / Galanthus Nivalus / Snowdrop
January 2021
25. Engels raaigras / Lolium perenne
June 2020
25. Oranje havikskruid / Hieracium Aurantiacum
July 2020
26. Kardinaalshoed / Euonymus fortunei
May 2020
27. Blauwe regen / Wisteria / Blue rain
June 2020
Close-up
28. Zonnebloem / Sunflower
July 2020
Close-up
29. Negenentwintig
30. Dertig
31. Eenendertig
Various
Ui / Onion
August 2020
Bezemskruid / Senecio inaequidens
July 2020
Aster
July 2020
Rode lelie / Red lily
July 2020
Fibonnaci and Sunflowers
You can discover mathematics in the garden.
One takes a head of a sunflower, let it dry for a while and
concentrates on the seeds and their arrangement.
The arrangement of spirals in the head of a sunflower appears to show Fibonnaci numbers:
Number of left hand oriented spirals: 55
Number of right hand oriented spirals: 34
The Fibonnaci Sequence is constructed with the formula
F(n) = F(n-1) + F(n-2) and the beginning of the sequence is as follows:
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144..
Amazing that Fibonnaci numbers seem to appear in nature a
lot.
If you divide 55 by 34, you get 1.617… which is very close
to the number phi (golden ratio)
Saturday, 2 November 2019
AM Stereo
Now and then I dismantle vintage audio equipment. It is good to see how professionals have designed their equipment. This time I had a closer look at the Denon AM-FM Stereo Tuner UTU-F88. I think it was designed around the '80-s.
I was surprised when I saw a part on the PCB that was allocated to 'AM Stereo'. This part of the PCB was not "bestueckt" (no components).
I was surprised when I saw a part on the PCB that was allocated to 'AM Stereo'. This part of the PCB was not "bestueckt" (no components).
AM Stereo was never used in The Netherlands as far as I know. In the US however various AM Stereo systems have been developped.
Thursday, 17 October 2019
PA100KLM
The call PA100KLM was acquired by HAM Operators that participate in the station PI9KLM.
These are (but not limited to) PA0PCV, PA0WBZ, PA0SNY, PA3GDF, PH0PPL, PA2AAP and PA2MCE.
PI9KLM (see www.pi9klm.nl) was founded in 1947 to give radio operating practice to new navigators/radio operators on board KLM aircraft.
After navigators became obsolete (around 1962) the station remained active, and was operated by HAM's that worked and have worked for KLM, the national airline of the Netherlands, founded on October 7, 1919.
In coming period (October, November 2019) KLM has many activities to celebrate the 100th birthday. Being the oldest existing airline in the world, KLM is the first to reach this age.
Therefore the call PA100KLM will be used by the HAM operators of PI9KLM. The transmissions take place from Hangar 12, of KLM's Maintenance facilities at airport Schiphol. The call will be terminated on November 30.
OPERATIONS START ON OCTOBER 7, AT THE CENTURY BIRTHDAY.
Aiming frequencies are 14,250 USB +/- 25 kHz and 7.150 LSB +/- 15 kHz for the time being
LAT/LON@Hangar12 are N 52deg 17min 49sec and E 4deg 47min 32sec - QTH locator is JO22JH(51).
See https://www.qrz.com/lookup for detailed information.
Fokker F2
Boeing 787-10
These are (but not limited to) PA0PCV, PA0WBZ, PA0SNY, PA3GDF, PH0PPL, PA2AAP and PA2MCE.
PI9KLM (see www.pi9klm.nl) was founded in 1947 to give radio operating practice to new navigators/radio operators on board KLM aircraft.
After navigators became obsolete (around 1962) the station remained active, and was operated by HAM's that worked and have worked for KLM, the national airline of the Netherlands, founded on October 7, 1919.
In coming period (October, November 2019) KLM has many activities to celebrate the 100th birthday. Being the oldest existing airline in the world, KLM is the first to reach this age.
Therefore the call PA100KLM will be used by the HAM operators of PI9KLM. The transmissions take place from Hangar 12, of KLM's Maintenance facilities at airport Schiphol. The call will be terminated on November 30.
OPERATIONS START ON OCTOBER 7, AT THE CENTURY BIRTHDAY.
Aiming frequencies are 14,250 USB +/- 25 kHz and 7.150 LSB +/- 15 kHz for the time being
LAT/LON@Hangar12 are N 52deg 17min 49sec and E 4deg 47min 32sec - QTH locator is JO22JH(51).
See https://www.qrz.com/lookup for detailed information.
Fokker F2
Boeing 787-10
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