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[[File:AMPLIFIER.jpg|200px|top]] | [[File:AMPLIFIER.jpg|200px|top]] | ||
[[File:BALL AND CIRCUIT.JPG|200px|bottom]] | [[File:BALL AND CIRCUIT.JPG|200px|bottom]] | ||
[[File:SOLID STATE RELAY.JPG|200px|bottom]] | [[File:SOLID STATE RELAY.JPG|200px|bottom]] | ||
[[File:BALL_AND_ROD.JPG|200px|bottom]] | [[File:BALL_AND_ROD.JPG|200px|bottom]] | ||