Designs submitted by Shane Oberloier

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A simple circuit board that fits in a RAMPS motor driver slot. It breaks out the Step, Direction, !Enable, and ground pins. These signals can now be used with larger high current stepper drivers.

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A +-5V power supply. The input is 12V (as a minimum, it can go up to 48V). Made to be used with this 12V power supply. The max current is 1A per supply. This supply works perfectly for amplifier circuits that deal with AC signals.

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A simple non-inverting amplifier circuit, built around the famous LM741 op-amp. The gain is settable from 1 to 101. Supply can be up to +-36V. If a negative supply is not available, tie the input to ground.

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A simple Radio Frequency Transmitter. The circuit includes a DC rejection capacitor, input low pas filter, and a resonant circuit for AM modulation. A tunable capacitor is used in order to generate a resonating carrier.
This design is made with reference to a design in Practical Electronics for Inventors, Third Edition

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This AC dimmer circuit utilizes a zero crossing detector and Triac. The output power can be controlled by adjusting a potentiometer value. The max current allowed is 10A (limited by the Triac).

This device can control the power delivered to any type of AC device, not just lamps. It can work on AC motors, heaters, power supplies,etc.

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This circuit is capable of generating a constant 13V from an input from a solar panel of 5V-17V (or more). There is also an extra 5V output for logic circuits (IE some sort of embedded control system). Design components and parameters were found using the Boost Converter - Component Calculator.

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A simple digital logic half adder. Runs on 5V logic. The circuit is constructed using 7400 series NAND gates, and a single MOSFET logic inverter. The logic inverter could be removed if you circuit can operate off of C' (complement of carry).

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A very simple 2 input, single channel logical AND gate using 2N2222 transistors. Use with 5V logic, may work with higher or lower logic levels though. Please comment if you've managed to make it work with different levels. This design can be used as a reference for more complex multi-input logic gates.

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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:

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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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