- The 10 commandments
- Study notes for my PADI Dive Master Certification
- The Unofficial Story [1996]
- Thrill seekers
- Things to remember while scuba diving
- December 2008
- Land veroverd op de zee
- Flight inquiry
- Januari 2009
- Februari 2009
- Maart 2009
- April 2009
- Mei 2009
- Juni 2009
- Juli 2009
- Augustus 2009
- September 2009
- Oktober 2009
- November 2009
- November 2008
- Secure internet appliance for home office
- Endurance Running
- Edison Lake to Graveyard Lake (CA)
- South Lake to Dusy Basin (CA)
- Happy Isles to Half Dome in Yosemite (CA)
- Mosquito Flat to Ruby Lake (CA)
- Silver Divide Timberline (CA)
- North Lake to Humphreys Basin (CA)
- Lake Sabrina to Midnight Lake (CA)
- Onion Valley to Charlotte Lake (CA)
- Snapshot backup on Synology
- Running routes in and around NW Portland
- Mosquito Flat to Pioneer Basin (CA)
- South Lake to Lake Florence (CA)
- Tuolumne Meadows to Towskey Lake (CA)
- White Pass to Shoe Lake in Goat Rocks (WA)
- Backpack to Green Lakes (OR)
- December 2009
- Endurance Running Pace Calculator
- Januari 2010
- Februari 2010
- Franciscus van der Sanden (1746 – 1796)
- Adriaan van de Sande (1769 – 1819)
- Pieter Jan van der Sande (1811-1884)
- Ko van der Zande (1851-1936)
- Jan van der Zande (1882 – 1953)
- Jo van der Zande (1908 – 1999)
- Foto’s (van der Zande)
- Leendert Verresen (1735-voor1824)
- Cornelis Verhese (1772-1817)
- Leonardus Verheesen (1797-1879)
- Piet Verhezen (1830-1903)
- Lowie Verheezen (1881-1972)
- Piet Verheezen (1908-1988)
- Toos Verheezen (1937)
- Bidprentjes (van de Zande)
- Coert Vonk (1965)
- Bram Vonk (1935-2006)
- Kees Vonk (1912-1993)
- Bram Vonk (1885-1955)
- Wilhelmus Cornelis Vonk (1858-1886)
- Sijbrand Vonk (1828-~1884)
- Jan Toonen Vonk (~1708-1762)
- Coenraad Vonk (1756-1806)
- Sijbrand Vonk (1790-1861)
- Foto’s (Vonk)
- Bidprentjes (Vonk)
- Foto’s (Verheezen)
- Bidprentjes (Verheezen)
- Foto’s (Nuijtemans)
- Bidprentjes (Nuijtemans)
- Photos (Levinson)
- Photos (Schulman)
- Barrie Levinson (1965)
- Daniel Levinson (1931-1991)
- Charlie Levinson (1895-1967)
- Doris Ruth Jalkow
- Boris Jalkow (1891-1961)
- Hyman Jalkow (~1845-~1950)
- Sylvia Schulmann (1905-2000)
- Benjamin Schichmann (-~1923)
- Maart 2010
- rabbi Opriotsky
- Cato Nuijtemans (1911-1987)
- Piet Nuijtemans (1878-1902)
- Johannes Franciscus Nuijtermans (1844-1887)
- Franciscus Nuijtemans (1822-1882)
- Christoffel Nuijtemans (1791-1829)
- April 2010
- Mei 2010
- Juni 2010
- Juli 2010
- Living with Adobe Encore
- Augustus 2010
- September 2010
- Electrical circuits
- Electronic circuits
- Gates and diode-resistor logic
- Bipolar junction transistor
- Field effect transistor
- Metal oxide silicon field effect transistor
- Math using gates
- Synchronous sequential
- Programmable logic
- Oktober 2010
- Introduction to the High Sierra Nevada
- November 2010
- December 2010
- Paragliding Pictures
- Januari 2011
- Februari 2011
- Maart 2011
- April 2011
- Importing GEDCOM
- Mei 2011
- June 2011
- Juli 2011
- Augustus 2011
- September 2011
- Architecture
- Instruction set
- Design
- Implementation
- Oktober 2011
- November 2011
- December 2011
- Januari 2012
- Base conversion on HP-41
- Curve fit on HP-41
- Derivative on HP-41
- Integrate on HP-41
- Row reduced echelon form on HP-41
- Discrete fourier transform on HP-41
- Hyperbolic operations on HP-41
- Complex eigenvalues on HP-41
- Complex matrix to row reduced echelon form on HP-41
- Polynomial factorization on HP-41
- Complex arithmetic with adjustable branch cut on HP-41
- Complex numbers on the HP-41
- Februari 2012
- Maart 2012
- April 2012
- Network Attached Storage, personal Cloud Storage
- Mei 2012
- Juni 2012
- Juli 2012
- DD-WRT and OpenVPN (without nvram footprint)
- DD-WRT leading two separate networks (Asus RT-N16)
- Augustus 2012
- September 2012
- Oktober 2012
- November 2012
- December 2012
- Januari 2013
- Reduce camcorder noise
- Februari 2013
- Maart 2013
- April 2013
- Mei 2013
- Juni 2013
- Juli 2013
- Augustus 2013
- September 2013
- Oktober 2013
- November 2013
- December 2013
- Januari 2014
- Februari 2014
- Maart 2014
- Sketchup configurable window
- Sketchup Configurable Door
- April 2014
- Mei 2014
- Juni 2014
- Juli 2014
- Augustus 2014
- September 2014
- Oktober 2014
- November 2014
- Johan’s Science
- December 2014
- Januari 2015
- Februari 2015
- Maart 2015
- April 2015
- DD-WRT leading two separate networks (Asus RT-AC68)
- Mei 2015
- Juni 2015
- Juli 2015
- High Sierra suggestions
- Impedance
- Euler’s formula
- Fourier transform
- Starting with Xilinx
- Laplace transform and proofs
- Mechanical systems
- Continuous transfer functions
- Evaluating continuous transfer functions
- Introduction
- Demonstration
- Adder and subtractor circuits
- A faster adder circuit
- Multiplier circuit
- SilverLit RC driver
- A faster multiplier circuit
- Divider circuit
- Square root circuit
- Introduction
- Hardware
- Byte protocol
- Byte protocol on Arduino
- Byte protocol on FPGA
- Message protocol
- Message protocol on Arduino
- Message protocol on FPGA
- Introduction
- Hardware
- Signal path
- Digitizing the analog signal
- Frequency and pitch detection
- Note level segmentation and buffering
- Conclusion
- Hardware
- Build environment
- Audio spectrum
- Visualization
- Remote control
- Making it dance
- Transfer function
- Transfer function
- Transfer function
- Soldering with kids
- Google Calendar Clock (ESP8266)
- Arduino parts
- Starting with Altera
- Introduction
- Math notes
- Mandelbrot
- Countdown
- Johan’s Art
- Johan’s Music
- Johan’s theoretical math
- Januari 2016
- Februari 2016
- Maart 2016
- April 2016
- Mei 2016
- Juni 2016
- Juli 2016
- Augustus 2016
- September 2016
- Oktober 2016
- November 2016
- December 2016
- Januari 2017
- Johan’s applied math projects
- Februari 2017
- Maart 2017
- April 2017
- Mei 2017
- Juni 2017
- Juli 2017
- Augustus 2017
- September 2017
- Johan’s Promo
- North Lake to Piute Lake (CA)
- Mosquito Flat to Gem Lakes (CA)
- Sabrina Lake to Dingleberry Lake (CA)
- Z-transform
- Overview
- Property proofs
- Function proofs
- Initial/final value proofs
- Inverse Z-transform
- Transfer functions
- Evaluating transfer functions
- SQL queries
- Complex arithmetic formulas (REPLACED)
- Geometric series
- Discrete FIR low-pass filter (unfinished)
- FIR filter using trigonometry
- LFZ Transform references
- Binomial theorem and series
- Partial fraction expansion
- Laurent series
- Oktober 2017
- November 2017
- December 2017
- Januari 2018
- Linear differential equations
- RL High-pass Filter
- Talk to your old CD player
- Complex numbers
- Functions of complex numbers
- DD-WRT reverse proxy and HTTPS
- Quadratic equations
- Google IoT meets ESP32, MQTT, Node JS
- Our vegetarian recipes
- Februari 2018
- Maart 2018
- April 2018
- Mei 2018
- Coert’s running log
- Google Assistant switches Sonoff S20
- Foundations
- Overview
- Line integrals in scalar field
- Double integrals
- Vector fields; Line Integrals; Work (in plane)
- Gradient field (in plane)
- Vectors
- Matrices
- Curl; Green’s (in plane)
- Flux; Green’s (in plane)
- Triple integrals
- Vector fields; surface integrals; flux (in space)
- Work (in space)
- Divergence (in space)
- Diffusion/heat (in space)
- Gradient field (in space)
- Curl (in space)
- Stokes’ for work (in space)
- Review
- Maxwell’s equations
- Coulomb’s law
- Electric field
- Gauss’ law
- Potential
- Gradient field; Faraday cage
- Energy density
- Capacitors
- Current; Ohm’s law
- Batteries; Kirchhoff’s rules
- Magnets; charges in motion and Lorenz fore
- Moving charge; Cyclotron
- Biot-Savart law; Gauss’s law for magnetism
- Ampère’s law
- Electromagnetic induction; Faraday’s law
- Motional EMF; AC motors
- Maxwell’s addition to Ampère’s law
- Heart
- Aurora Borealis
- Levitation
- Self-inductance; RL circuit
- Magnetic field energy
- Materials; 4th Maxwell equation
- Frequency response
- Bandwidth and Q-factor
- Appendix
- Unit step response
- Frequency response
- Appendix A
- Appendix B
- Two different real poles
- Coinciting real poles
- Complex poles
- Appendix
- RS-485 bus
- Hardware
- Tools
- Debugging
- Protocol
- Deploying
- Interface software
- Web UI
- Home automation
- Google calendar alarm
- Google calendar clock
- Merge Google sheets
- Google sheets project roles
- WikiTree biography
- Arduino rotary encoder
- ESP-IDF components
- BLE iBeacon scanner and advertiser
- 5 minute short
- Day 1
- Day 2
- Day 3
- Day 4
- Day 5
- Day 6
- Day 7
- Day 8
- Day 9
- Day 10
- Day 11
- Day 12
- Day 13
- Day 14
- Day 15
- Exchanging video between DaVinci Resolve and FFMPEG