https://wiki.kptree.net/ 2026-09-19T12:37:24+00:00 https://wiki.kptree.net/ https://wiki.kptree.net/_media/wiki:dokuwiki.svg text/html 2025-12-30T03:48:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/project:index?rev=1767066488&do=diff raspberry_pi rpi linux server setup summary index Project Index I have published these notes on my public wiki website <https://wiki.kptree.net/>, for my own access and also and possible benefit to others. I am not interested in advertising on this site. As these are my personal notes, provided without cost, I assume no obligations in anyway should anyone in anyway use them in full or part. YOU USE THESE NOTES AT YOUR OWN RISK! text/html 2025-12-30T03:30:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/project:leds?rev=1767065453&do=diff diode led Electronics Info/Data LEDS and Diode notes Some rough notes concerning LEDs and diodes. References * Basic Light Emitting Diode guide * Guide to LED Circuit Designs and LED Basics & Operation Resistor ColourRing 1Ring 2Ring3Ring 4 Figure 1Figure 2MultiplierToleranceBlack001Brown11101%Red221002%Orange331,000Yellow4410,000Green text/html 2024-08-24T08:27:38+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/project:sprinklers?rev=1724488058&do=diff sprinkler inductor controller solenoid valve solenoid_valve Sprinkler Solenoid 24VAC Woes See my Home Sprinkler notes I have had many problems with my sprinkler system; decrepit failing 30 year old underground wiring, failing solenoid valves and their solenoids. Some of the old solenoid valves were replaced as they had mechanically failed. The multiple issues made it vary difficult to diagnose what was happening at any time. text/html 2025-12-29T00:06:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/project:surge_protector?rev=1766966776&do=diff surge surge_protector varsistor gdt mov Surge Protector I purchase ARLEC Premium Surge Protectors from Bunnings in Dec 2025 for $18.67 each (I got an additional 5% trade discount.). I tore apart a unit to see what it was made of. I was impressed with the construction and purchase a total of 6 units, including the tear down unit which I do not intent to bring back into service, plus a spare. This allows a unit to be installed in each bedroom and study, which also aligns with the household ge… text/html 2024-02-25T09:07:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/project:oscilloscope?rev=1708852023&do=diff oscilloscope Oscilloscope I recently purchase a small single channel digital oscilloscope, Zeeweii DSO154Pro. Typical for Chinese supply the instruction provided are terse. These are some additional notes. DSO154PRO Parameters (from suppliers manual): The accuracy above 15MHz may be such that use in this range is limited.