Audio Amplifier

  Week Four: 25 February 2022   Meeting Attendance: ·         Daniel Knight ·         Conor Lambe ·         Itamar Panzo   Progress during week four: During this week we fixed the LM386 mono amplifier by adding a decoupling capacitor to reduce noise from the DC source, and replacing the IC chip. After this, the circuit amplifies the input as expected, with a gain of 20, but similar to the stereo OPA2134 circuit, the output power is not enough to drive the 30W speakers. When using a 32Ω set of headphones (which require less power), however, the audio is amplified as expected with little distortion. According to the LM386 datasheet, adding resistors and capacitors across the pins 1 & 8 can adjust the gain. We added a 10μF capacitor across these pins, which resulted in a boost of the gain from 20 to 200. Also, we soldered a copy of the working LM386 circuit onto a...

  Week Three: 18 February 2022   Meeting Attendance: ·        Daniel Knight ·        Conor Lambe ·        Itamar Panzo   Progress during week three: During this week we managed to test the circuit once again, this time we got an aux cable to be able to connect it to the phone so that it plays music. It was discovered that the stereo amplifier works when music is connected at the input instead of of the function generator. The wires were soldered to the 3.5mm headphone jack. Problems Faced: A few problems were faced during testing, the  mono amplifier differently doesn't work when music is connected, produces random sound.   The speakers couldn’t be powered enough, they required 30W and so a power amplifier was required to produce this.  Due to speaker’s circuit doesn’t amplify noise any more than a phone would Goal for week four: o      F...

  Week Two: 11 February 2022   Meeting Attendance: ·        Daniel Knight ·        Conor Lambe ·        Itamar Panzo   Progress during week two: The first amplifier was built using an LM386, we had decided to work on the poster as well as the two other amplifiers, the OPA2134PA and OPA134PA. It was then later realized that the two remaining amplifiers were the same so only one more was built. We had used two AC inputs for the OPA2134PA, simulating stereo and we managed to get a gain of 2. We connected the speaker to the circuit that Conor had built,  and proved that the audio was being amplified as the amplitude/frequency was being changed. During this week the blog was also started    Goal for week three: Further assess the circuit Conor built to find more possible mistakes Build one more circuit Simulate circuits on Multism Connect phone to the ...

Week One: 4 th February 2022 Aim: An audio amplifier using Op-Amps which is able to amplify the audio   Meeting Attendance: ·        Daniel Knight ·        Conor Lambe ·        Itamar Panzo Progress during week one: For the first session we had decided to build three different audio amplifiers, before building the amplifiers we collected the components that were ordered. To be able to construct the circuits we first took a look at the datasheets for the different amplifiers and took down relevant information. The next step was simulating the circuit on Multism, after that we managed to build an LM386 circuit. Tests were done using an oscilloscope to verify that the circuit was amplifying the signal. Figure showing LM386 audio amplifier Goal for week two: Build the two remaining amplifiers Get the aux cable to be able to connect the phone to the circuit Work on the poster ...