Vacuum Tube Guitar Amplifier With Bluetooth and Power Scaling
VACUUM TUBE GUITAR AMPLIFIER WITH BLUETOOTH AND POWER SCALING Presenters: Nick Hill, Adam Schmolling, Allan Bekkala
Advisor: Dr. Stanley Burns Date: 04/26/2016 ABSTRACT This project was to design and construct an AB style vacuum tube guitar amplifier that has Bluetooth connectivity as well as the ability to scale the volume output without losing power tube distortion. The Bluetooth
connectivity allows the user to stream background music into the amplifier, while an audio mixer allows the background music and guitar signal to be mixed. The user also has the option of choosing between a GZ 34 tube rectifier and a solid-state full wave bridge rectifier. The amplifier outputs 35 watts (rms) to a 2 x 12 speaker enclosure. The amplifier head can be connected to any cabinet with an impedance of 4, 8, or 16 (as the amplifier has an impedance selector switch). The preamplifier consists of 3, 12AX7 tubes, and the power amplifier consists of 2, EL34 tubes. The rectifier
tube, as mentioned above, is a GZ34. The guitar signal and backing music are mixed with a tube based summing amplifier (also a 12AX7 tube), and the respective volumes of both signals can be controlled. This senior design project is a culmination of 2 semesters worth of work. In retrospect the project has been 80% design, and 20% actual construction. We have constructed the enclosures for both the amplifier head and the speakers. We have wired up the entire circuit. The end result has been an excellent guitar amplifier, which has applications all across the music industry.
Goal: INTRODUCTION To design a high quality valve amplifier based on the Marshall JTM-45
Features: 1. Bluetooth connectivity a.
2. To enable the user to play along with a backing track via smartphone Dual rectifier
a. To enable the user to alternate between a solid state and tube based rectifier 3. Power-scaling a.
4. To allow for more power tube distortion at a lower volumes Meets all environmental and health standards
a. Follow the National Electrical Code b.
Lead-free solder OVERALL DESIGN TUBE BASICS
PRE-AMP DESIGN 12AX7 VOLTAGE AMPLIFIER MIXER & CATHODE
FOLLOWER BLUETOOTH CONNECTIVITY TONE STACK
LONG TAILED PAIR PHASE INVERTER PUSH-PULL POWER AMPLIFIER
POWER SUPPLY Design: Voltage Regulator / Rectifier for Bluetooth IC
Pre-Testing Design Voltage regulator and rectifier for RN-52 Bluetooth chip (note: capacitor value has been changed due to design specs. The value is now 2000uF.)
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