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A simple 8 channel denounce circuit board. Wire your buttons (or relays) to a positive voltage, and bring them (along with a ground reference). The output of the board will be a nice clean transition from high to low (and vice versa)

The filtering circuit is a first order low pass filter that operates on the equation:

$$f_c=\frac{1}{2\pi{RC}}$$

Where $f_c$ is your desired cutoff frequency in Hz. A handy sage mathematics script was written to easily calculate and experiment with values for the 1st order filter:

6.1.1.3 Low Drop Out Regulators vs. Buck Converters

In this video the energy efficiencies of Low Drop Out (LDO) regulators and Buck converters is discussed. A quick graph is generated in Sage Mathematics to compare the two circuits power consumption

When designing any microcontroller (uC) based system, I find it can be a good idea to first plan out what signals are going to go to which pin on a the uC. Sitting down and filling out a document like the one pictured above can be a very efficient way to organize your thoughts and rap your head around your design. Your allocation document will also help when routing your schematic, PCB, when you are writing software, and when you are debugging. This document can be very valuable and is often overlooked!

A pin allocation planner for the Atmega32A

Currently the OCI standard is to use QUCS as a simulation environment, and KiCAD as a design environment. However wouldn't it be nice if everything could all be done with a single tool? Well that may be a possibility worth exploring. The CERN group has put some work into integrating SPICE into KiCAD. Just check out the video below!

Jay Carlson on his site jaycarlson.net has compiled an extremely comparative report of a wide range of 21 microcontrollers that are less than $1 USD. Selecting microcontrollers can be a daunting task and this acts as a great reference. Check out his work below!

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This design is a simplified H-bridge power inverter. It is completely open loop - there is no voltage or current control. The part count is as minimal as possible, and is intended to act as a template for more complex designs.

The design is not fully routed because some traces must be 8mm - which is impossible to route given DIY design techniques. In order to get around that, wire can be soldered underneath the board in place of traces.

The code has not been written fro the design. It may closely follow the attached Octave script for logic.

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Fixed 5V output - with an input range of 6V to 35V. Fits in standard breadboard. Either barre jack input, or bare wire into terminal blocks. Terminal block outputs available as well. LED power indicator.

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