Educational apparatus

Claim 1

TEACHING APPARATUS COMPRISING A PLURALITY OF OPERATING UNITS IN THE FORM OF SEPARATE BOXES EACH CONTAINING A HIGH-GAIN AMPLIFIER HAVING NEGATIVE FEEDBACK MEANS; EACH OF SAID BOXES BEING PROVIDED AT THE SIDES THEREOF WITH PLUG AND RECEPTACLE CONNECTOR MEANS COMPRISING A MALE CONNECTOR AND A FEMALE CONNECTOR RIGIDLY SECURED TO RESPECTIVE SIDES OF THE BOX AND HAVING MULTIPLE CONDUCTOR ELEMENTS; ONE CONNECTOR OF EACH OPERATING UNIT BEING ENGAGED WITH A CORRESPONDING CONNECTOR OF ANOTHER OPERATING UNIT TO CONNECT ALL OF THE UNITS TOGETHER ELECTRICALLY AS WELL AS PHYSICALLY; CIRCUIT MEANS CONNECTING CORRESPONDING ELEMENTS OF THE MALE AND FEMALE CONNECTORS OF EACH UNIT TOGETHER WITHIN THE RESPECTIVE UNIT TO PROVIDE PARALLEL CIRCUITS, THEREBY PERMITTING THE UNITS TO BE ASSEMBLED IN DIFFERENT PHYSICAL CONFIGURATIONS AS DESIRED WHILE STILL MAINTAINING ELECTRICAL CONTINUITY BETWEEN THE CONNECTORS OF THE VARIOUS UNITS; A CONTROL UNIT SEPARATE FROM SAID OPERATING UNITS, A POWER SUPPLY CIRCUIT IN SAID CONTROL UNIT FOR ACTIVATING THE AMPLIFIERS IN ALL OF SAID OPERATING UNITS, CABLE MEANS EXTENDING FROM SAID CONTROL UNIT TO ONE OF SAID OPERATING UNITS, MEANS INCLUDING SAID CABLE MEANS CONNECTING SAID CONTROL UNIT POWER SUPPLY CIRCUIT TO PREDETERMINED ELEMENTS OF THE CONNECTORS AT SAID ONE OPERATING UNIT, THEREBY TO SUPPLY POWER IN COMMON TO ALL OF THE CORRESPONDING CONNECTOR ELEMENTS OF THE INTERCONNECTED OPERATING UNITS; MEANS WITHIN EACH OF SAID OPERATING UNITS CONNECTING THE POWER TERMNALS OF THE RESPECTIVE AMPLIFIER TO SAID CORRESPONDING CONNECTOR ELEMENTS TO SUPPLY POWER TO ALL OF THE AMPLIFIERS FROM SAID CONTROL UNIT: LEADS INTERCONNECTING THE INPUTS AND OUTPUTS OF THE AMPLIFIERS OF SAID OPERATING UNITS TO FORM A COMPLETE SIMULATED SYSTEM; AND METER MEANS CONNECTED TO ONE POINT OF SAID SYSTEM TO PROVIDE A VISUAL DEMONSTRATION OF DYNAMIC SYSTEM EFFECTS.