ZENER DIODE XOR GATE – LOGIC GATE XNOR GATE – LOGIC GATE WIRES NOT CONNECTED WIRES CONNECTED WIRE WATT METER VOLTAGE SOURCE VOLT METER VERICAP DIODE VARIABLE RESISTOR VARIABLE INDUCTOR VARIABLE CAPACITOR TUNNEL DIODE TRIMMER RESISTOR TRANSISTOR PNP TRANSISTOR NPN TRANSFORMER SWITCH STEP UP TRANSFORMER STEP DOWN TRANSFORMER SPEAKER SOLDER BRIDGE SCOTTKY DIODE SCHMITT TRIGGER RESISTOR REPAY SPST RELAY SPDT PUSH BUTTON SWITCH POTENTIO METER POLARIZED CAPACITOR PMOS TRANSISTOR PHOTO RESISTOR PHOTO DIODE OR GATE – LOGIC GATE OPTO COUPLER OP AMP OHM METER NOT GATE – LOGIC GATE NOR GATE – LOGIC GATE NMOS TRANSISTOR NAND GATE – LOGIC GATE MUX MOTOR MICROPHONE LIGHT EMITTING DIODE LAMP JUMPER JFET-P TRANSISTOR JFET-N TRANSISTOR INDUCTOR INDUCTOR IRON GROUND EARTH GROUND DIGITAL GROUND CHASIS GENERATOR FUSE ELECTRIC BELL DIP SWITCH DIODE D – FLIP FLOP DEMUX DARLINGTON PAIR DIGITAL TO ANALOG CONVERTER CURRENT SOURCE CRYSTAL OSCILLATOR CONTROLLED VOLTAGE SOURCE CONTROLLED CURRENT SOURCE CAPACITOR BUZZER BUS BRIDGE CIRCUIT BATTERY BATTERY CELL ANTENNA AND GATE – LOGIC GATE AMMETER ANALOG TO DIGITAL CONVERTER AC SOURCE