Logicworks rc circuit how to#
I enjoyed learning how to use tools like an oscilloscope and a high speed camera to see the square wave output of my NGO. From this project, I learned that digital logic still relies heavily on smaller analog circuits. The project fulfils its purpose without fail. I learned how integrated circuit boards work and how to properly use them. In conclusion, this circuit taught me a lot about how digital logic works. See the chart right for tests with different resistance and capacitance. Adjusting the capacitance of C2 and resistance of R4 will change the frequency of which an LED placed on pin 10 of the IC blinks. The cycle repeats until the duration circuit provides less than half the input voltage and NAND gate two can no longer receive two high signals. When the capacitor no longer provides half the input voltage, one of the inputs to the second NAND registers a low signal and it outputs high again.
This causes NAND gate four to output a low signal. C2 can now drain into NAND gate four and NAND gate 3 will output a high signal. If C1 is not drained, the second NAND gate receives two high signals and outputs low. The signal then feeds back on itself along with the duration circuit into the second NAND gate. A high signal on the second NAND gate travels through R4 and fills up C2 until the resistance is more than 470Ω. The final RC circuit of the NGO determines how fast the square wave oscillates. Note: All values are in flashes per 10 seconds unless otherwise stated When the button is pressed, an LED on pin three will illuminate and then stay lit when the button is no longer pressed and the capacitor supplies more than half the input voltage. The NAND gate now outputs a high signal and stops positive current from sinking into ground through the IC. When the charge provided by the capacitor is no longer half of the original input signal, the NAND gate registers two low inputs. When the button is no longer pressed, the capacitor drains into the 1MΩ resistor and the NAND gate. This means that an LED placed on pin three of the IC will ground itself and illuminate. The high current then moves into the second NAND gate and triggers a low signal output. When pressing the button, the high signal from the first NAND gate grounds into the capacitor until the resistance of the capacitor is too great. The first resistor-capacitor (RC) circuit of the NGO determines how long the square wave in the final circuit will oscillate for. When the button is not pressed, an LED placed on pin 11 will illuminate. The positive current sitting on pin 11 flow.
Pressing of the button delivers low signals on the input pins and the gate outputs a high signal. The positive current on pin 11 can sink itself into the IC.
At rest, the first NAND gate receives two high signals and outputs a low signal. The input of the NGO is the momentary press of the pushbutton switch. Pin numbering starts at the left below the notch and moves anti-clockwise. NAND gates face each other on both the top and bottom of the IC as seen in fig. The 4011 IC requires positive current on pin 14 and a ground connection on pin seven to work reliably. The NGO uses a pushbutton switch and a pull up resistor to ensure conditioned inputs. Inputs must be conditioned with distinct high and lows. Pin 3 then outputs high or low based on the inputs. A 4011 Integrated Circuit (IC), like nearly all ICs requires a power source and a ground. The project began with an overview of how a 4011 Quad input NAND Gate works. The rates must vary based on the configuration of resistor-capacitor circuits in the NAND Gate Oscillator (NGO). The square is to turn on and off an LED at varying rates and a set duration. The purpose of this project is to create a square voltage wave using analog and digital logic.
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