Connected the high pass filter with the low pass filter, then feed the output of the combined filters into an op-amp to amplify the output signal. With the microphone connected to the filters with a breakout, and with the output of the op-amp connected to a 2-sided 3.5mm cable using a breakout, I then use a 3.5mm to USB adapter to integrate the circuit with the laptop and the webapp
Spent the week building multiple passive high pass filters, built high pass filters with the same cutoff frequencies and had the output of one cascade into the input of another. There are four high pass filters connected each filter was designed to have a 40Hz high pass filter cutoff frequency. Then connected the microphone with the low pass filter that was already built, then sent the output of the low pass filter to the laptop. The output sent to the laptop sounded very low when played on the laptop.
The schedule is on progress
The plan for the upcoming weeks is to work on amplifying the output of the circuit with an op-amp and connecting the high pass filter with the rest of the circuit. After the low pass filter, the output can be amplified. Then by using the 3.5mm breakout, the 3.5mm 2-sided cable, and the 3.5mm to USB adapter the output can be sent to the laptop.
Improved on the filter circuit by using four of the same low pass filters with the same cutoff frequency of 14kHZ and cascading the output of one filter into the input of another filter, the system of low pass filters reduced the peak to peak voltage of the output signal of the system to less than 10 percent of the peak to peak of the input signal to the system. Also, tested the integration of the microphone, two 3.5mm breakouts, two-sided aux cable, aux to USB adapter, and laptop. The components were able to properly integrate and get sound from the mic onto the laptop.
The schedule is on progress.
Plans for the upcoming week is to now integrate the microphone with the filter circuit as an input and then integrate the output of the filter circuit with the other components like the laptop. Also, plan to work on the high pass filter part of the circuit.
Spent time testing the filter circuit. After testing founding that the filter was starting to cut off around 60kHz, but the desire is to cut off at 14kHz. Started to build the same resistor and capacitor configuration as the current low pass filter. The plan is that with multiple low pass filters with the same configuration, the output of one low pass filter can be feed into the input of another low pass filter in order to achieve the desired frequency cut off.
The progress is still on schedule
The plan for the coming week is to continue working on the filters and solder the other 3.5mm jack breakout. Also, connect the mic, the two breakouts, the 2 sided cable, the 3.5mm jack to the usb converter, and the laptop just to see if the parts allow the mic to properly connect to the laptop
Build the high pass filter circuit and connected the high pass filter circuit with the loss pass filter circuit. Had to put some resistors in series in order to achieve the desired frequency cutoffs. Also, soldered the 3.5mm breakout with metals pins so that the breakout could be put in the breadboard and connect to the breadboard.
The schedule is on progress.
Plans for the upcoming week is to test the low pass and high pass filter, connect the breakout with the circuit using wires, and also connect the microphone to the breakout and circuit. Then test the circuit again after connection the microphone is implemented.
Built a passive low pass circuit, using a resistor and capacitor from the lab. Also, calculated the capacitor and resistor values for the high pass filter. The goal is a filter that allows frequencies between 40Hz – 14Hz, so picking the proper resistors and capacitors an important. Currently, there is a 4-kiloohm resistor and 1 microFarad capacitor for the low pass filter and a 10-ohm resistor and 1 microFarad. Also, parts were picked up and moved into the lab.
The schedule is on progress
Plans for the upcoming week is to implement the high pass filter. Also, test that the low pass and high pass filter works for the proper frequency range using the lab oscilloscope, and then start the process of connecting the microphone to the circuit.
Filled out multiple order forms for the different types of parts that are going currently going to be used for the filter. Items like mics, jack breakouts, different types of splitters, and etc. Waiting for the parts to be delivered. Also, looked into the type of resistors and capacitors to use for the filter circuit.
The schedule is on progress
For the upcoming week, planning on building a filter circuit and using an oscilloscope to test that the circuit filters within the desired range of approximately 40Hz – 14kHz
Decide to switch microphone to be used in system with a different microphone. The change was made because the new mic is battery powered and the old mic for the system was not. Having a mic with its own more source gives one less thing to worry about.
Currently, the plan is slighlty behind schedule, plans to get back on schedule is to order parts in the coming week
Plans for coming week is order parts, and start to build the circuit on a breadboard, using the circuit components, like resistore, provide by the design course
Spent researching additional components for the pre-filtering circuit. Plan on using two 3.5mm jack breakouts to feed from microphone to circuit and out of circuit. And plan to use 3.5mm jack to usb converter to then feed the output into a laptop.
Progress, maybe be a little behind schedule, I plan on purchasing parts in the coming week to try and keep on schedule
For the coming week, I plan on purchasing materials and starting to actually put some components on a circuit board. However, the upcoming design review might make it hard to find time to work in the lab
Spent time brainstorming on how to filter out background noise for the microphone input we are going to use. Planning on using circuitry to make the filter at this stage of the stage, because of increased speed.
Progress is on schedule
For the upcoming week I plan to have components gathered, and a schematic of the desired circuit drawn up.
