Schematic Symbols and Components

Schematic SymbolsObjectives

Recognize Schematic SymbolsBe able to draw the schematic symbols

Recognize the actual componentsUnderstand the basic function of each component

ResistorsResistor

Potentiometer

Photoresistor

Capacitors: Basic Function: Stores electrical charge, used to

filter low frequencies

Electrolytic

Mylar (chicklet)

Disc

Variable capacitor – Used in tuning circuits (tuning knob on a radio).

1uF

+

1uF

1uF

1uF

Diodes (one-way check valve for electricity)

Diode

Zener Diode

Photo-Diode

Light Emitting Diode

Transistors: switch, oscillator,

amplifier

NPN Transistor

PNP Transistor

UJT Transistor

Photo Transistor

NPN

PNP

UJT

Switches

Normally Open

Normally Closed

SPST (Single Pole, Single Throw)

SPDT (Single Pole, Double Throw)

LightsIncandescent

Neon

Florescent

Electromagnetic Devices

Coil

Speaker

Microphone

Electromagnetic DevicesRelay (Electromagnetically controlled switch)

Transformer

Antenna

Motor

ThyristorsSilicon Controlled Rectifiers (Gated Diode)

TRIAC (used to control AC circuits / like 2 SCR’s back to back)

Meters

Digital MultimetersOhmmeters

Ammeters

Voltmeters

Digital Logic Gates

AND

NAND

OR

NOR

XOR

Inverter (NOT)

GeneralFuse

Wire Crossing not connected

Wires Crossing & Connected

Buzzer + -

1A

GeneralConnector

Terminal

Crystal

Voltage Regulator

Operational Amplifier

IN

COM

OUT78L05

Voltage Sources

Battery

AC Voltage Source1.0 kHz

-1/1V

+

Voltage Sources / GroundsEarth Ground

Chassis Ground

AC Plug

AC Outlet

Sources for pictures Capacitor: http://images.google.com/imgres?imgurl=http://blogs.courant.com/colin_mcenroe_to_wit/capacitor.jpg&imgre

furl=http://blogs.courant.com/colin_mcenroe_to_wit/2009/02/ok-ok-tales-of-geets.html&usg=__2F74WQM_txJ3Ue6FuDfV-DoUO18=&h=564&w=1081&sz=147&hl=en&start=1&um=1&tbnid=yaoeg4Bbu7btxM:&tbnh=78&tbnw=150&prev=/images%3Fq%3Dcapacitor%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

NPN Transistor: http://images.google.com/imgres?imgurl=http://www.solarbotics.com/assets/images/tr2222/tr2222_pl.jpg&im

grefurl=http://www.solarbotics.com/products/tr2222/&usg=__HCmGR5I7ru69QrUnQRgtwtjY-X4=&h=450&w=600&sz=23&hl=en&start=3&um=1&tbnid=8ho2yU-_u_gxlM:&tbnh=101&tbnw=135&prev=/images%3Fq%3Dnpn%2Btransistor%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

NPN transistor schematic: http://images.google.com/imgres?imgurl=http://www.weidemyr.com/com/electro_transistorsymbol-f.png&img

refurl=http://www.weidemyr.com/com/electro.shtml&usg=__21jIsCFUOo4sAvbx2PKE94QHJ9E=&h=500&w=468&sz=12&hl=en&start=6&um=1&tbnid=VDfCRle8pJxkUM:&tbnh=130&tbnw=122&prev=/images%3Fq%3Dnpn%2Btransistor%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

Voltage regulator:

http://images.google.com/imgres?imgurl=http://www.electronicrepairguide.com/7808%2520voltage%2520regulator.jpg&imgrefurl=http://www.electronicrepairguide.com/restore-crt.html&usg=__8bRR7QtFOPxrgwD-wZwcHu8wopA=&h=331&w=311&sz=17&hl=en&start=3&um=1&tbnid=EGC6FDfPgLccDM:&tbnh=119&tbnw=112&prev=/images%3Fq%3Dvoltage%2Bregulator%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

Sources PNP transistor schematic (also has another, more detailed version of the NPN schematic:

http://images.google.com/imgres?imgurl=http://www.abcofelectronics.com/p-n-p-symbol.gif&imgrefurl=http://www.abcofelectronics.com/integratedcircuits.htm&usg=__MdxQpmAWaItgW9JT6VMLNywhP0A=&h=289&w=405&sz=8&hl=en&start=6&um=1&tbnid=C0ohQY_zsjgWwM:&tbnh=88&tbnw=124&prev=/images%3Fq%3DPNP%2Btransistor%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

PNP transistor:

http://images.google.com/imgres?imgurl=http://www.c-stamp.com/images/CS560000.jpg&imgrefurl=http://www.c-stamp.com/components.htm&usg=__Hq_yfnl6KIOcvDi2drVGKwbWbB0=&h=169&w=256&sz=6&hl=en&start=21&um=1&tbnid=LBO_DsAspRH3IM:&tbnh=73&tbnw=111&prev=/images%3Fq%3DPNP%2Btransistor%2Bpicture%26ndsp%3D18%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN%26start%3D18%26um%3D1

 

PNP transistor 2:

http://images.google.com/imgres?imgurl=http://www.pagermotors.com/index_files/Products/Electronic_Components/3906_Transistor/3906_Transistor_(L).gif&imgrefurl=http://www.pagermotors.com/index_files/Products/Electronic_Components/3906_Transistor/3906_Transistor.htm&usg=__L1sTWwBMlojaDxeD10ArgSHfBmc=&h=377&w=395&sz=28&hl=en&start=26&um=1&tbnid=XjMupWmI5vj-5M:&tbnh=118&tbnw=124&prev=/images%3Fq%3DPNP%2Btransistor%2Bpicture%26ndsp%3D18%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN%26start%3D18%26um%3D1

UJT Transistor:

http://www.globalspec.com/FeaturedProducts/Detail/Unijunction_Transistors_UJTs_from_AMS/93313/0?deframe=1

Photo Transistor:

http://rocky.digikey.com/weblib/Optek/Web%20photos/OP505x,%20506x.jpg

Diode:

http://images.google.com/imgres?imgurl=http://mustangsva.co.uk/wp-content/uploads/2009/04/diode.gif&imgrefurl=http://mustangsva.co.uk/2009/04/02/back-emf-protection-diodes/&usg=__aLQfjZ6rhkadtrrtGyiJ7S3fK2o=&h=296&w=300&sz=9&hl=en&start=7&um=1&tbnid=x_PEPyVPTY1qDM:&tbnh=114&tbnw=116&prev=/images%3Fq%3Ddiode%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3DwkF%26sa%3DG%26um%3D1

Zener Diode:

http://images.google.com/imgres?imgurl=http://shop.4atraders.com/shop/images/Zener%2520Diode.jpg&imgrefurl=http://shop.4atraders.com/shop/products_new.php&usg=__4r-VfGLq6GKSEiPQKJZ141BOfd4=&h=360&w=360&sz=52&hl=en&start=1&um=1&tbnid=JPMG9fZjVWyACM:&tbnh=121&tbnw=121&prev=/images%3Fq%3Dzener%2Bdiode%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3D86u%26sa%3DG%26um%3D1

Photo Diode:

http://www.mi-lasers.com/stock/ToshibaTOLD9231_300.jpg

Photo Diode 2:

http://rocky.digikey.com/weblib/Panasonic/Web%20Photos/New%20Photos/PNZ300F.jpg

Sources LED:

http://images.google.com/imgres?imgurl=http://technabob.com/blog/wp-content/uploads/2007/10/led_of_led_1.jpg&imgrefurl=http://technabob.com/blog/2007/10/07/giant-led-lamps-made-from-leds/&usg=__Q__BApCDgeOisXs7Ocmx4xNRp4A=&h=382&w=520&sz=25&hl=en&start=2&um=1&tbnid=6QsDcrRDWc4G9M:&tbnh=96&tbnw=131&prev=/images%3Fq%3Dlight%2Bemitting%2Bdiode%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3DWUa%26sa%3DG%26um%3D1

LED Schematic:

http://images.google.com/imgres?imgurl=http://www.aprosystems.com/image/led_e.gif&imgrefurl=http://www.aprosystems.com/about_led_e.htm&usg=__Mj1ou4ZgzgFoEoza4SSy557R4Sw=&h=444&w=353&sz=32&hl=en&start=23&um=1&tbnid=_HBSss17tBjWoM:&tbnh=127&tbnw=101&prev=/images%3Fq%3Dlight%2Bemitting%2Bdiode%26ndsp%3D18%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3D5Va%26sa%3DN%26start%3D18%26um%3D1

Switches schematic:

http://images.google.com/imgres?imgurl=http://www.xmission.com/~daina/images/switches.gif&imgrefurl=http://www.xmission.com/~daina/tips/pub/tip0222.html&usg=__-AE-7XrhE0uieksNNZlPBbp_D2Y=&h=171&w=444&sz=2&hl=en&start=3&um=1&tbnid=ad9PMviOUwCMYM:&tbnh=49&tbnw=127&prev=/images%3Fq%3Dnormally%2Bopen%2Bswitch%26ndsp%3D18%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3D2Wa%26sa%3DG%26um%3D1

Normally open switch:

http://images.google.com/imgres?imgurl=http://www.bcae1.com/images/gifs/switpush.gif&imgrefurl=http://www.bcae1.com/switches.htm&usg=__SKDS4Lq_a7SpvbKyLEpBjNHTh30=&h=308&w=347&sz=4&hl=en&start=5&um=1&tbnid=YdtkOXT2IX1RaM:&tbnh=107&tbnw=120&prev=/images%3Fq%3Dnormally%2Bopen%2Bswitch%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

Normally closed switch:

http://images.google.com/imgres?imgurl=https://www.dsuban.com/secure/images/products/2752.bmp&imgrefurl=http://www.dsuban.com/Kit-Masters--Fan-Clutch-Experts-v18/&usg=__B_jnzfd7KUYnPFjD0pqRKrOO-xU=&h=445&w=427&sz=559&hl=en&start=3&um=1&tbnid=MjW6N9j6dAol8M:&tbnh=127&tbnw=122&prev=/images%3Fq%3Dnormally%2Bclosed%2Bswitch%2Bexample%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1

SPST schematic:

http://images.google.com/imgres?imgurl=http://www.colehersee.com/images/resource/SPST.GIF&imgrefurl=http://www.colehersee.com/04resource/dict_s.htm&usg=__dFHwTuWreldqW91WdO2aW_3jQc4=&h=495&w=657&sz=18&hl=en&start=1&um=1&tbnid=zJlagNTbsv3xPM:&tbnh=104&tbnw=138&prev=/images%3Fq%3DSPST%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1