1. Lock, Stock, and Three Smoking Coils: The Electric Musket
Ryan Eder
David Grothe
Jason Kamuda
Thomas Minor 1

2. Device Narrative Microcontroller Device Characteristics:
1 I2C port for LCD display
5 A/D Converters for measuring charge on 9V batteries and capacitor banks
RTI internals for timing
1 External Interrupt for coulomb counter
6 Interrupt on change inputs for position sensors
4 Interrupt on change inputs for control push buttons
1 Interrupt on change input for the trigger

3. Hardware Narrative Drive Circuit: 9V Battery through LDO -> 5V
5V through Buck/Boost -> 3.3V for Micro
Battery Backup Circuit:
9V to battery charger ->
Coulomb counter -> Li Battery
Li Battery through Buck/Boost -> 3.3V for Micro
Capacitor Charging Circuit:
9V Battery through LDO -> 5V
Load Switch to turn ON/OFF
5V through DC/AC -> 900V rms
900V rms through full bridge SCR recitfier
Cap bank chosen by SCR
Fire Circuit:
IGBT’s used to switch caps through coils
Position Sensors used to determine position and velocity
Diodes to obtain left over coil energy

4. Schematic Micro LCD Random digi-jock on his own, 3 stage ripple fire5V
LDO
Position
Sensors
3.3V
Buck/Boost
Micro
LCD
Battery
Charger
Coulomb
Counter/
Gas Gauge
Random digi-jock on his own, 3 stage ripple fire
Less funding
Not as up to date in theory
Less access to latest technology
Load Switch
Full Bridge
Rectifier 5V
LDO
SCR’s, IGBT’s
Capacitors,
And Coils X3
DC/AC Step Up