Headphone amplifier

The headphone amplifier with VU-meters almost finished:

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

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

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

                                                        January 2021


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. Tweeentwintig

23. 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)