Musical Tesla Coil

Michael Adams Roger Baudier

Jonathan Hoffpauir Joseph Werling

Milestone 1 Goals

• Control Circuit:– Finish building and test

• Secondary Circuit:– Measure the inductance, capacitance, and impedance of the secondary coil– Attach the top load

• Power Supply:– Finish the power supply

• Transmission System– Build the system– Begin testing the system

• User Input System:– Get input from the keyboard– Begin implementing the key press algorithm.– Should be functioning, but not complete. We will test different algorithms on the

coil once the systems are assembled.

Control Circuit

• Progress at Milestone 1:– Circuit assembled– Output at transformer tested

Control Circuit

• Without half-bridge load

• With half-bridge load

Control Circuit

• New circuit design– Emitter-follower– Transformer resistor

Control Circuit

• Half-bridge input with emitter-follower

• Half-bridge input with emitter-follower and transformer resistor

Control Circuit

• Current output

Control Circuit

• Milestone 1 goals– Finish building and test

• Future goals– Get half-bridge working– Tune the coil– Integrate 555 timer and antenna– Build backup design (if necessary)

Secondary Circuit Progress

• Milestone 1 goals– Measure the inductance, capacitance, and impedance of the

secondary coil– Attach the top load

Progress made• Cut extra PVC pipe off of Coil

– 2 in. left on top– 1 in. left on bottom

• Measured Inductance of Coil• Constructed Top Load

– Measured capacitance

• Secondary Circuit Complete

Secondary Coil

• Measured InductanceL = 30.572 mH

• Measure ResistanceR = 77.98 Ω

8 in. Diameter Top Load

• Measure Capacitance C = 5.8 pF

6 in. Diameter Top Load

• Measured Capacitance C = 11.7 pF

Secondary Coil

• Resonant Frequency

f = 266,121.2051 Hz

Power Supply

• Milestone 1 goals.– Finish the power supply.

• Progress from Milestone 1– Secondary supply finished and tested.– Primary supply wired and tested.– Addition of 10 Amp breaker.– Terminal block added as capacitor bleed.

Power Supply

• Secondary supply– Added 5 v regulator

Power Supply

• Primary supply– Full wave rectified 120Vac.– 1500uF smoothing capacitor.– 16 gauge wire.

Power Supply

• Breaker – 10 Amp breaker added to limit current and

when open, isolates the high voltage supply from control circuit.

Power Supply

• Terminal block– Used to bleed the large primary capacitor.– Currently contains a 1 kΩ resistor.– Drains capacitor in ~10 seconds.

Transmission System

• Milestone 1 goals– Build the system– Begin testing the system

• Progress Made– System completely built– Testing/troubleshooting in progress

Transmission System

• Originally Tested with Resistor in the right circuit to 190 kOhms• With more testing, by increasing the Resistor to 470 kOhms, the

DC Offset was reduced to 1V and P-P was increased to 2.6V

Transmission System Testing• Need to design an Inverter Amplifier Circuit• Need to determine how the 1V DC Offset will affect the Input to

the control circuitry

User Input System

• Last semester’s design:

– Problems with this design

User Input System

• New circuit design– Optocoupler

User Input System

• Current progress– Getting MIDI signals– Data corruption issue– Developing key press algorithms– Demonstration

User Input System

• Milestone 1 goals– Get input from the keyboard– Begin implementing the key press algorithm.– Should be functioning, but not complete.

• Future goals:– Get MIDI data without corruption– Implement key press algorithms– Integrate with transmission system– Test input algorithms on the Tesla coil

Summary of Progress

• Primary circuit built, currently testing• Secondary coil completed• Power supply completed• Transmission system built, currently

testing• User input system built, produces output,

currently debugging

Summary of Future Goals

• Control Circuit– Get half-bridge working– Tune the coil– Test various effects of different primary inductors– Integrate 555 timer and antenna

• Transmission System– Compete the system

• User Input System– Get MIDI data without corruption– Implement key press algorithms– Integrate with transmission system– Test input algorithms on the Tesla coil

• Integrate Systems and Test