Air cushion inflation machine

An apparatus, comprising:

• a first terminal, wherein the first terminal is connected to a direct current input;
• a second terminal;
• a reference resistor, wherein the reference resister is powered by the direct current input;
• a sealing band apparatus comprising:
• a first terminal and a second terminal, wherein a meltable material placed between the first terminal and the second terminal is melted by resistance of current flowing between the first terminal and the second terminal;
• and
• a voltage measurement device that measures a measured voltage drop between the first terminal and the second terminal of the sealing band apparatus;
• a first op-amp having a first terminal, a second terminal, and an output;
• a first transistor having a base connection, an emitter connection, and a collector connection;
• a variable voltage source comprising:
• a second op-amp having a first terminal, a second terminal, and an output;
• a reference voltage connected to the first terminal of the second op-amp;
• a first voltage resistor and a second voltage resistor connected in parallel to the second terminal of the second op-amp;
• a voltage switch connected to the first resistor and the second resistor;
• wherein the voltage switch connects the first voltage resistor to ground when in a first position and connects the second voltage resistor to ground when in a second position, and wherein the voltage switch changes position based on the measured voltage drop;
• a second transistor having a base connection, an emitter connection, and a collector connection, wherein the base connection of the second transistor is connected to the output of the second op-amp, the collector of the second transistor is connected to the first terminal of the first op-amp, and the emitter of the second transistor is connected to the second terminal of the second op-amp, the first voltage resistor, and the second voltage resistor;
• wherein the first terminal of the first op-amp is connected to the variable voltage source via the collector of the second transistor and the second terminal of the first op-amp is connected to the reference resistor;
• wherein the base connection of the first transistor is connected to the output of the first op-amp, wherein the emitter connection of the first transistor is connected to the reference resistor, and wherein the collector connection of the first transistor is connected to the first terminal of the sealing band apparatus and allows for a constant current to flow to the first terminal of the sealing band apparatus;
• wherein the variable voltage source changes voltage based on the measured voltage drop and the constant current.