Edulog System

Educational Analog Modules

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The Edulog module system aims to give an introduction to analog signal processing for those venturing into the world of electronics. I plan on completing several modules that introduce the concepts of amplifiers, filters, oscillators, and more. The first three modules to this system are the power module, op-amp amplifiers (inverting and non inverting), and filters (active lowpass, and highpass). Each module is intended to be assembled as a kit, and will include supplemental information, including assembly instructions, and background theory. This is intended to be a system for hobbyists and students alike.

Op-Amp Explorer:

  • 2 Channels
  • One inverting channel
  • One Non-Inverting Channel
  • Utilizes very low cost LM741
  • AC or DC Coupling Selection
  • Adjustable Gain through R5 and R6 (Using variable resistors)


Preview of theory section in kit manual.

Adobe Portable Document Format - 391.08 kB - 08/08/2019 at 04:35


  • Design Log #2

    Zach Strohm09/23/2019 at 19:25 0 comments

    Hey everyone, I finally had some time to work on projects again, and reworked the Op-Amp explorer board. I changed the general layout to make it more intuitive for a beginner, the components are laid out on the board in representative locations from the schematic. There are now also test points, thanks to a suggestion made to me. This should allow for quick measurements from points in the circuit that were not accessible in the previous revision.

    I do plan on ordering boards, and constructing this revision soon. Then, I will work on writing an assembly guide, and update the workbook. As always, feel free to contact me more suggestions and comments.

  • Design Log #1

    Zach Strohm08/08/2019 at 04:49 0 comments

    Hey everyone,

    I  have just completed the preliminary design for the Op-Amp Explorer 1, which will be referred to as OE-1. This is a board with one inverting channel, and one non-inverting channel. The most glaring change that needs to be made is to add the potentiometers to the layout, which are currently represented as resistors. I was hoping to find some small-format rheostats in place of the pots, but the potentiometers appear to be less expensive. Currently, the module is to be presented as a kit for assembly by the user. The only pre-assembled part are the SMD power decoupling capacitors on the back.

    I am starting work on the power supply board, which should be done shortly. It uses a voltage divider, with a virtual ground with 7805 (+) and 7905 (-) regulators to give a +/- 5V output. This could be stepped up in the future with a beefier wall-wart, or ultimately, a boost regulator.

    Please stay tuned for updates, and feel free to offer any input on the project that you may have.

View all 2 project logs

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nike9307 wrote 08/21/2019 at 18:34 point

Hay man i wanted to say that this is an amazing idea and i hope you help beginners learn.

May i make a suggestion? I'm an electronics engineer and i currently work as a PCB designer. One of the things i like to do on prototypes (if i have the space for it) is to use a header as a "test point" for interesting signals. It may be a good idea to have something like that, so beginners can measure signals easier. Just as an example - test points directly on the inputs of the op amp. 

Hope i was not too long winded with the suggestion?. Best of luck with your projects :)  

  Are you sure? yes | no

Zach Strohm wrote 09/23/2019 at 19:28 point

Thank you! I just added some test points to the board and did some other rework based on your suggestion.

  Are you sure? yes | no

nike9307 wrote 10/19/2019 at 18:43 point

I'm glad you liked the idea. Best of luck with the project. 

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