Symbols, schematic 1381 IC Battery Buffer or Capacitor, fixed Capacitor, fixed, polarized Diode Diode, light-emitting (LED) Diode, photosensitive (photodiode) Diode, zener Ground Inverter Inverter, Schmitt PUT (programmable unijunction transistor) Resistor, fixed Resistor, photosensitive (photoresistor) Resistor, variable SCR (silicon controlled rectifier) Switch, double-pole, double-throw Switch, double-pole, single-throw Switch, single-pole, double-throw Switch, single-pole, single-throw Thermistor Transistor, bipolar, NPN Transistor, bipolar, PNP Transistor, Junction FET, N-channel Transistor, Junction FET, P-channel Transistor, MOSFET, N-channel, depletion mode Transistor, MOSFET, N-channel, enhancement mode Transistor, MOSFET, P-channel, depletion mode Transistor, MOSFET, P-channel, enhancement mode Transistor, photosensitive (phototransistor) Triac UJT (unijunction transistor)

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