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Tube Microphone
Škoda, Adam ; Šotner, Roman (referee) ; Staněk, Miroslav (advisor)
The presented thesis deals with a tube microphone using a condenser microphone capsule for sound capturing. Moreover, two essential aspects of a tube microphone – the basis of its operation and its design – are also discussed in this thesis. In the designed microphone, there is a vacuum tube known as ECC81. This vacuum tube is used as an amplifying element of an input sound signal. This paper also includes the choice of the most suitable microphone circuit, its modification and the design of a voltage source used for feeding and heating the vacuum tube. Some appropriate simulations were applied to find out the functionality of all designed parts of the microphone system. Following step was the practical realization of all microphone parts as well as the activation and the complete parameters and characteristics measurements of realized microphone system. After the provided measurements, the microphone was compared to equivalent commercial products. Evidently, the realized microphone is qualitatively similar to other commercial products. Presented thesis also contains the list of components and PCBs.
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Guitar electron-tube amplifier
Kokolia, Martin ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
The objective of this bachelor’s thesis was to design a low-frequency tube amplifier optimized for use with electric guitar. The preamp is equipped with ECC83 triode tubes as voltage amplifier and cathode follower for connection with a simple frequency corrector. The output of the FX loop allows the connection of external effects. The power amplifier is realized by dual-action 6L6 tubes and phase invertor with ECC81 triode. Output transformer allows impedance matching for speakers. The power supply uses a GZ34 rectifier tube and diode bridges. Text of thesis also includes theoretical design of guitar tube amplifier and documentation of realization of functional prototype.
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Guitar electron-tube amplifier
Kokolia, Martin ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
The objective of this bachelor’s thesis was to design a low-frequency tube amplifier optimized for use with electric guitar. The preamp is equipped with ECC83 triode tubes as voltage amplifier and cathode follower for connection with a simple frequency corrector. The output of the FX loop allows the connection of external effects. The power amplifier is realized by dual-action 6L6 tubes and phase invertor with ECC81 triode. Output transformer allows impedance matching for speakers. The power supply uses a GZ34 rectifier tube and diode bridges. Text of thesis also includes theoretical design of guitar tube amplifier and documentation of realization of functional prototype.
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Tube Microphone
Škoda, Adam ; Šotner, Roman (referee) ; Staněk, Miroslav (advisor)
The presented thesis deals with a tube microphone using a condenser microphone capsule for sound capturing. Moreover, two essential aspects of a tube microphone – the basis of its operation and its design – are also discussed in this thesis. In the designed microphone, there is a vacuum tube known as ECC81. This vacuum tube is used as an amplifying element of an input sound signal. This paper also includes the choice of the most suitable microphone circuit, its modification and the design of a voltage source used for feeding and heating the vacuum tube. Some appropriate simulations were applied to find out the functionality of all designed parts of the microphone system. Following step was the practical realization of all microphone parts as well as the activation and the complete parameters and characteristics measurements of realized microphone system. After the provided measurements, the microphone was compared to equivalent commercial products. Evidently, the realized microphone is qualitatively similar to other commercial products. Presented thesis also contains the list of components and PCBs.
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