1. Fixed-value resistor Variable resistor Voltage-sensitive resistor (varistor) Resistors Sources Constant-voltage source Constant-current source AC oscillator source Batteries Single-cell battery Multiple-cell battery Circuit protectors Fuse Circuit breaker Capacitors Fixed-value capacitor Electrolytic capacitor Variable capacitor Ground Crystals Piezoelectric crystal Earth ground Chassis or frame connection Isolated

2. Lamps Incandescent lamp Signal lamp Flashing signal lamp Neon lamp, DC type Neon lamp, AC type Fluorescent lamp Two-terminal Inductors Fixed-value inductors With magnetic core variable inductors Audio devices Loudspeaker Microphone Amplifiers Single-ended amplifier Differential amplifier (or comparator) Norton (current) amplifier Waveguide Circular waveguide Rectangular waveguide Flexible waveguide Twisted waveguide Transformers Transformer (air core) Transformer (iron core) Transformer (ferrite core) Shielded transformer

3. Cable Two-conductor cable with grounded shield Coaxial cable with grounded shield Twisted pair Stripline Unbalanced stripline Contacts Fixed relay contact Fixed switch contact Moving contact, locking Moving contact, nonlocking Closed contact Open contact Make-before-break contact assembly Break-before-make contact assembly Monostable multivibrator Monostable(single-shot,one-shot) Phase shifters Matched phase shifter Schmitt trigger General Switches Single-pole single- throw (spst) Single-pole double- throw (spdt) Double-pole double- throw (dpdt) Push-button switch, normally open Push-button switch, normally closed Multiposition switch

4. Relays From A, spst normally open (make) From B, spst normally closed (make) From C, spst (break, make) From D, spst (break, make) Filters Mode filter Bandpass filter Low-pass filter High-pass filter Band-reject filter Microwave circuits Waveguide hybrid junction Stripline hybrid junction Coupling by loop to space Coupling by loop to guided transmission path Coupling by loop from coaxial to circular waveguide, with DC grounds connected Dual directional coupler Fixed-direction circulator Reversible-direction circulator Mode suppressor for both coaxial and waveguide transmission

5. Diodes Rectifier (junction) diode A K Zener (undirectional breakdown) diode Bidirectional breakdown diode Constant-current (field-effect) diode Tunnel diode Tunnelrectifier (backward) diode Schottky (hot-carrier) diode P-i-n diode Gunn diode, also impatt diode Step-recovery(snap, charge-storage) diode Varactor (variable- capacitance) diode Transistors NPN transistor Multiple-emitter npn transistor PNP transistor E E E E C B npn Darlington transistor C E B C E B C E B C E B C E B npn Schottky transistor C E B Unijunction transistor (UJT) with n-type base B2 E B1 A K A K A K A K A K A K A K A K A K A K A K A K AK A K A K A K

6. E B2 B1 Unijunction transistor (UJT) with p-type base Programable unijunction transistor (PUT), also SCR with n-type base Thyristors Four-layer (pnpn, Shockley) diode A K Silicon-controlled rectifier(SCR) Silicon-controlled switch(SCS) Diac(bidirectional switch) T T Triac(grated bidirectional switch) TT G Field-effect Transistors(FETs ) N-channelP-channel Junction-gate (JFET) D S G D S G D S G Three-terminal depletion-type insulated-gate (IGFET) D S G D S G D S G Three-terminal depletion- type IGFET, substrate tied to source S G D S G D Four-terminal depletion- type IGFET S G D B S G D B Four-terminal enhancement-type IGFET A K G A K AK G A K G1 G2 S G D B S G D B TT T T

7. Five-terminal dual-gate depletion-type IGFET S G1 D B G2 S G1 D B G2 Five-terminal dual-gate enhancement-type IGFET Optoelectronic diodes Light-emitting diode(LED) Photodiode Npn bidirectional photodiode(photo-duo-diode) Pnp bidirectional photodiode(photo-duo-diode) Pnp two-segment photodiode, with common cathode Pnp four-quadrant photodiode, with common cathode A A A A K Phototransistors Npn phototransistor, no base connection C E Npn phototransistor, with base connection C E B Optically coupled isolators With photodiode output With phototransistor output, no base connection With phototransistor output, and base connection B S G1 D G2 D S G1 B G2 A K A K A A T T T T

8. With photo-Darlington output, no base With photo-Darlington output, and base With NAND-gate-photo detector output Gate Dual-input multiple-input AND gate NAND gate, negated output NAND gate, negated input OR gate NOR gate, negated output NOR gate, negated input Exclusive-OR gate Inverter gate FLIP-FLOPS R-S (set-reset) flip-flop Toggle-flip-flop J-K flip-flop D-type flip-flop Voltage amplifier Transcomductance amplifier Transresistance amplifier VCVS Current amplifier Kvi CCC S KIi