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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