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Audio power amplifier with audio processor and FFT analysis
Kubáň, Marián ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This thesis is concerning about design of an audio power amplifier for home listening. Amplifier involves two audioprocessors, the first one chooses one of the four avaliable audio stereo inputs. The second just sets the considered shape of frequency characteristic of one of the picked audio signal. As soon as tha signal leaves the audiprocessors, its path is divided. First route leads to the power amplifier and second one ends up in the analog to digital converter. Both audiprocessors are adjusted via IIC line by 8-bit microcontroller. The primary role of microcontroller is to enumerate frequency coefficients through the fast fourier transformation with Cooley-tukey algorithm. Result of FFT is then displayed on graphical display unit. The whole desired parametres as volume, trebble, input selection, atc., are driven with one controller and that is a rotary encoder.
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Class A audio power amplifier with tubes
Krutílek, David ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The topic of my bachelor´s theis is of the class A audio power amplifier using vacuum tubes which is completed with phono preamplifier and input selector. There are used ECC 83 and ECC 88 vacuum tubes for the pre-amplifier design, then EM 84 tubes for the „eye-magic“ equalizer and 300B tubes for the power amplifier design. The maximum output power is 2 x 20W to 8 ? load. In this paper there are presented schematics of the pre-amplifier and power amplifier too. The aim of this bachelor´s project was make complete design of laboratory prototype (scheme, layout of printed circuit, part list and placemnet), realisation function of prototype and laboratory measurements.
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Design of Audio Power Amplifiers
Gasnárek, Jiří ; Kratochvíl, Tomáš (referee) ; Šebesta, Jiří (advisor)
The aim of the bachelor's thesis is the description of design and construction audio power amplifiers. This topic is very voluminous and therefore I limited it to basic familiarization with options of bias point placement, connection of power transistors and requested properties of audio power amplifier. It is requested to reach a balanced amplification in transferred frequency band (20 Hz – 20 kHz), to eliminate passage distortion by linearization of passages, to stabilize the amplifier by negative feedback and minimize the signal distortion in limitation by suitable concept of the DC source. Following part contains a suggestion of end transistor properties based on requested output and impendance, their choice (2SC5200, 2SA1943) and calculation of expected heat lost of the amplifier. From known transfer temperatures is set a request on an end transistor cooler. The final part deals with a sketch of scaling way of amplifiers, assumed value and objective comparison of modules. I discuss there possibility of subjective comparison by listening to the same part of sound recording via both modules.
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Audio power amplifier 2 x 50 W
Skalický, Pavel ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The topic of my bachelor´s theis is design of class AB audio power amplifier 2 x 50 W/4 with preamplifier and stereo output. The design is standard solution of stereophonic version of power amplifier, with monolithic integrated circuit 2 x LM 3886. The project deals also with preamplifier with integrated circuit LM 1036, calculation of heat sink of power circuits and solution of supply. The aim of this bachelor´s project was make complete design of laboratory prototype (scheme, layout of printed circuit, part list and placemnet, amplifier arrangement), realisation function of prototype and laboratory measurements.
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Class A audio power amplifier with tubes
Krutílek, David ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The topic of my bachelor´s theis is of the class A audio power amplifier using vacuum tubes which is completed with phono preamplifier and input selector. There are used ECC 83 and ECC 88 vacuum tubes for the pre-amplifier design, then EM 84 tubes for the „eye-magic“ equalizer and 300B tubes for the power amplifier design. The maximum output power is 2 x 20W to 8 ? load. In this paper there are presented schematics of the pre-amplifier and power amplifier too. The aim of this bachelor´s project was make complete design of laboratory prototype (scheme, layout of printed circuit, part list and placemnet), realisation function of prototype and laboratory measurements.
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Design of Audio Power Amplifiers
Gasnárek, Jiří ; Kratochvíl, Tomáš (referee) ; Šebesta, Jiří (advisor)
The aim of the bachelor's thesis is the description of design and construction audio power amplifiers. This topic is very voluminous and therefore I limited it to basic familiarization with options of bias point placement, connection of power transistors and requested properties of audio power amplifier. It is requested to reach a balanced amplification in transferred frequency band (20 Hz – 20 kHz), to eliminate passage distortion by linearization of passages, to stabilize the amplifier by negative feedback and minimize the signal distortion in limitation by suitable concept of the DC source. Following part contains a suggestion of end transistor properties based on requested output and impendance, their choice (2SC5200, 2SA1943) and calculation of expected heat lost of the amplifier. From known transfer temperatures is set a request on an end transistor cooler. The final part deals with a sketch of scaling way of amplifiers, assumed value and objective comparison of modules. I discuss there possibility of subjective comparison by listening to the same part of sound recording via both modules.
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Audio power amplifier with audio processor and FFT analysis
Kubáň, Marián ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This thesis is concerning about design of an audio power amplifier for home listening. Amplifier involves two audioprocessors, the first one chooses one of the four avaliable audio stereo inputs. The second just sets the considered shape of frequency characteristic of one of the picked audio signal. As soon as tha signal leaves the audiprocessors, its path is divided. First route leads to the power amplifier and second one ends up in the analog to digital converter. Both audiprocessors are adjusted via IIC line by 8-bit microcontroller. The primary role of microcontroller is to enumerate frequency coefficients through the fast fourier transformation with Cooley-tukey algorithm. Result of FFT is then displayed on graphical display unit. The whole desired parametres as volume, trebble, input selection, atc., are driven with one controller and that is a rotary encoder.
|
|
|
Audio power amplifier 2 x 50 W
Skalický, Pavel ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The topic of my bachelor´s theis is design of class AB audio power amplifier 2 x 50 W/4 with preamplifier and stereo output. The design is standard solution of stereophonic version of power amplifier, with monolithic integrated circuit 2 x LM 3886. The project deals also with preamplifier with integrated circuit LM 1036, calculation of heat sink of power circuits and solution of supply. The aim of this bachelor´s project was make complete design of laboratory prototype (scheme, layout of printed circuit, part list and placemnet, amplifier arrangement), realisation function of prototype and laboratory measurements.
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