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Welcome to the world of Electronics

This course will take you to the magnificent world of electronics. Have you always wanted to be able to design your own electronics circuits? This is your chance!

We start with a few lessons about voltage, current en resistance. Next, we'll discuss power dissipation and capacitors, diodes and transistors.
We now have enough knowlegdge to build a simple power supply. And after a few lessons about differential amplifiers and operational amplifiers, we are even able to design and build a professional lab power supply. En after an extra lesson we can calculate the heatsink we need.
Next, we learn how to design a power amplifier.
After that, we will discuss inductors. And how to calculate decibels, often used in voltage and power ratios.
After building a Vocal Eliminator (a handy device allowing you to remove the vocals from a song), we will discuss different kinds of FET's and filters.
Next, we return to semi-conductors: DIAC's, SCR's and TRIAC's.

Since this course is far from finished, please visit it regurlarly for the latest update.
NEW! Many asked for it, and it's now finally available: the whole course in a PDF file, wich can be dowloaded as a self-extracting file and as a zip file. The layout might not be perfect, but it's better than nothing. This PDF file has been digitally signed.
You can also download the whole course in HTML format, again as a self-extracting file and as a zip file.
The self-extracting files are digitally signed, so you can be sure they have not been tampered with.

Download options:

  exe zip
html html.exe (1.7MB) html.zip (1.6MB)
pdf pdf.exe (1.8MB) pdf.zip (1.7MB)

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Lastest updates:

2 July 2009:

- Finally, the html pages have more user-friendly names. It used to be something like chXXsXX.html. This caused problems when adding such an address in a forum: every time a new chapter or section was added, the existing html pages got different names. Every page mentioned a "go.php" link you could use instead. Many people however, still used the chXXsXX.html. Now, every page has a friendly name you can use, without having to copy-paste a "go.php" link. The "go.php" links will still work, so you don't have to update all your posts in forums. The chXXsXX.html will NOT work anymore!

29 June 2009:

- Lesson 10: Made a few modifications to the schematic to make the power supply more stable.

24 June 2009:

- Some footnotes were quite long. In the PDF version this resulted in an ugly layout and drew the attention away from the lesson. So the long footnotes have been moved to appendices.

23 June 2009:

- Lesson 12: Some waveforms were missing. That has been fixed.
- Reduced some pictures in size so that they fit on the pages in the PDF document.

22 June 2009:

- Lesson 9: Added a diode and transistor tester.
- Lesson 4: Corrected the equation in "Relation between voltage and current".
- Reduced some pictures in size so that they fit on the pages in the PDF document.

25 January 2008:

- Lesson 5.2: Corrected miscalculation in the power dissipation of the diode.

1 July 2007:

- No changes in the course itself, but in the PDF file. In the previous versions, images were quite big. This has been repaired.

18 Febuary 2007:

- Lesson 3.2: Corrected error in calculating RMS value

27 November 2005:

- Total redesign. Now written using DocBook. Allows me to easily create a web site and PDF file using the same source.
- Lesson 11: Typo: RTHJ-A should be RTHJ-C.
- Lesson 24: Typo in first line.

3 July 2005:

- Lesson 9: In 9.4, added a resistor between opamp and transistor.
- Several lessons. Changed contrast of the pictures.

5 June 2005:

- Lesson 24: Automatic volume control. Updated values of C2 and R7.
- Lessons 4 and 23. Updated.

20 May 2005:

- Lesson 24: Automatic volume control. Updated.

11 May 2005:

- Lesson 23: TV Deflection circuit. New lesson.
- Lesson 24: Automatic volume control. New lesson.

27 Febuary 2005:

- Lesson 10: Lab power supply. Added 2 extra resistors so you can safely power on the supply while FB+ and FBGND are still disconnected.

20 Febuary 2005:

- Lesson 10: Lab power supply. Made some changes to prevent oscillation.

8 Febuary 2005:

- Lesson 10: Lab power supply. Made some changes so the output voltage is *really* load-independant.

29 January 2005:

- Lesson 4: Capacitors. Added section 4.3 Relation between voltage and current.
- Lesson 13: Inductors. Added section 13.2 Relation between voltage and current.
- Lesson 19: LC Filters. Added section 19.4 Resonance.
- Various lessons: Corrected some grammatical errors.

27 August 2004:

- Lesson 9: Operational Amplifier. Added section 9.4: Used as a current source.
- Lesson 20: Miscellaneous filters. New lesson.
- Lesson 21: Frequency-independant voltage devider. New lesson.
- Lesson 22: DIACs, SCRs and TRIACs. New lesson.

25 July 2004:

- Lesson 19: LC filters. New lesson.
- Lesson 13: Inductors. Moved section 'Tuned circuit' to Lesson 19. Added section 'Quality factor'.

26 June 2004:

- Lesson 4: Capacitors. Added a section about ESR.
- Lesson 7: DC Power Supply. Added a section about ESR in the intermezzo on calculating the capacitance of the buffer capacitor.

12 June 2004:

- Lesson 4: Capacitors. Added a section about phase shift. Also corrected some in filter calculations.
- Lesson 13: Inductors. Corrected some errors in filter calculations (forgot the phase shift).

5 June 2004:

- Lesson 17: JFETs. Made a few changes.
- Lesson 18: MOSFETs. Made a few changes. Extended section 18.2.

21 April 2004:

- Lesson 6: Transistors. Corrected an error in section 6.3.

17 April 2004:

- Lesson 6: Transistors. Added intermezzo about thermal stability.

21 March 2004:

- Lesson 18: MOSFETs. New lesson.
- Lesson 2: Current and Resistors. Added interesting link.

17 March 2004:

- Lesson 15: Vocal eliminator. The inverting and non-inverting inputs of a few opamps had been swapped. Schematic and PCB have been updated.

15 Febuary 2004:

- Lesson 7: DC Power Supply. Added some extra tips an warnings.

15 November 2003:

- Lesson 17: JFETs. Inside a JFET.

10 November 2003:

- Measuring voltage, current, resistance, diodes and transistors using a multimeter
- Inside a diode and transistor


If you have any comments about the contents or about my writing, please drop a message.

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