Izdelava kitarskega ojačevalnika z elektronkami

Kumperščak, Gal (avtor), Guna, Jože (mentor)

V tem diplomskem delu je opisan postopek načrtovanja in izdelava ojačevalnika za kitaro z vakuumskimi cevmi – elektronkami, ki je cenovno dostopen in lahko po kakovosti zvoka konkurira serijsko izdelanim ojačevalnikom. Cilj projekta je bil izdelati ojačevalnik, ki ne bi bil le cenovno ugoden, temveč bi bil tudi sposoben proizvesti bogat in dinamičen zvok, primerljiv z zvokom vrhunskih ojačevalnikov. Za dosego tega cilja sem kot izhodišče uporabil načrt ojačevalnika Fender 5E3, saj je o tem ojačevalniku na voljo veliko literature. Poleg tega so bili kompleti delov na voljo po nizki ceni, zato je bil zelo praktična izbira za projekt. Po pridobitvi potrebnih sestavnih delov sem začel sestavljati vezje ojačevalnika in ga vgradil v kovinsko ohišje. Nato sem vezje povezal z elementi na ohišju. Ko je bilo to končano, sem sestavil leseno ohišje in vanj namestil 30-vatni zvočnik ter kovinsko ohišje. Na koncu sem dodal še prekrivalo za zvočnik, da bi ojačevalniku dal končni estetski pečat. Da bi ocenil delovanje kitarskega ojačevalnika, sem opravil meritve njegove vhodne impedance in ojačenja. Rezultati so pokazali, da sta se vhodna impedanca in ojačenje zmanjševala s frekvenco vhodnega signala. V idealnem primeru bi ti meritvi ostali konstantni ne glede na frekvenco, vendar moje ugotovitve kažejo, da je potrebna nadaljnja izboljšava zasnove, z namenom ohranjanja vhodne impedance in ojačenja konstantne. Na splošno je bil ta projekt dragocena učna izkušnja pri načrtovanju in izdelavi kitarskega ojačevalnika z elektronkami. Čeprav je še veliko prostora za izboljšave, menim, da je končni izdelek uspešna in stroškovno učinkovita rešitev za glasbenike, ki iščejo kakovosten zvok po dostopni ceni.

• Jezik: Slovenski jezik
• Ključne besede: kitarski ojačevalnik, vhodna impedanca, elektronke, vakuumske diode, ojačenje vezja, izdelaj sam
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: FE - Fakulteta za elektrotehniko
• Leto izida: 2023
• PID: 20.500.12556/RUL-149122
• COBISS.SI-ID: 165047299
• Datum objave v RUL: 04.09.2023

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Designing and Building a Vacuum Tube Guitar Amplifier

Izvleček

This thesis describes the process of designing a tube amplifier for guitar that is affordable and can compete in sound quality with mass-produced amplifiers. The aim of the project was to design an amplifier that was not only affordable, but also capable of producing a rich and dynamic sound comparable to that of high-end amplifiers. To achieve this goal, I used the schematic of the Fender 5E3 as a starting point, as there is a lot of literature available on this amplifier. In addition, parts kits were available at a low cost, so it was a practical choice for the project. After obtaining the necessary components, I started to assemble the circuit board of the amplifier and mounted it in a metal enclosure. I then connected the circuit to the elements on the enclosure. Once that was done, I assembled the wooden cabinet and installed the 30-watt speaker and the metal enclosure. Finally, I added a speaker cover to give the amplifier a final aesthetic touch. To assess the performance of the guitar amplifier, I took measurements of its input impedance and gain. The results showed that the input impedance and gain decreased with the frequency of the input signal. Ideally, these measurements would remain constant regardless of frequency, but my findings suggest that further refinement of the design is required in order to keep the input impedance and gain constant. Overall, this project has been a valuable learning experience in the design and construction of a tube-based guitar amplifier. Although there is still much room for improvement, I believe that the final product is a viable and cost-effective solution for musicians looking for quality sound at an affordable price.

• Ključne besede: guitar amplifier, input impedance, tubes, vacuum diodes, gain, DIY