The most useful electronic schematic symbols

These schematic symbols were created using ProSchematic a super easy to use schematic drawing tool (schematic capture tool).

Note: Passive devices are devices that do not change or amplify voltage or current when another parameter is altered i.e. they react the same way and when a voltage or current (ac or dc) is applied a constant output is observed e.g. a resistor, capacitor, inductior, diode.

Note: Active devices are the opposite of passive i.e. they alter their behaviour due to another parameter usualy to amplify (e.g. transistor) but also act as a controlled switch (e.g. thyristor). Another example is the resistance of a fet changing when the gate voltage changes.

Schematic symbols for passive devices:

resistor schematic symbol Resistors
thermistor schematic symbol Thermistor  

or temperature dependent resistor
preset schematic symbol Presets

Those three pin skeleton things that never fit into veroboard and you end up soldering veropins and piggybacking the thing on top!
Really the same as a variable resistor with no case and much smaller.
variable resistor schematic symbol Variable resistors

Proper panel mount units with a  metal or plastic spindle - plastic is easier to cut.
light dependent resistor schematic symbol Light dependent resistor
capacitor schematic symbol Capacitors
electrolytic capacitor schematic symbol Electrolytic capacitors

These contain a electrolyte solution and when placed the wrong way round generally explode.  These are also the symbols for tantalum which when placed the wrong way round generally smoke!
variable capacitor schematic symbol Variable capacitors

These are the ones on a transistor radio 265pF (or larger for older radios).
trimmer capacitor schematic symbol Preset or trimmer capacitors

These are miniature capacitors either with overlapping vanes (small round) ~65pF or a single plate that is rasied of the other with a  screw.
inductor schematic symbol Inductor  
diode schematic symbol Diode 
zener diode schematic symbol Zener Diode
diac schematic symbol Diac
bell schematic symbol Bell
buzer schematic symbol Buzzer 
diode schematic symbol Fuse 
lamp schematic symbol Lamp 
loudspeaker schematic symbol Loudspeaker 
microphone schematic symbol Microphone
transformer schematic symbol Transformer
crystal schematic symbol Crystal
LED schematic symbol LED
Light detecting diode schematic symbol Light detecting diode
volt bar power supply schematic symbol Volt bar (power supply)
chassis GND schematic symbol Chassis GND
normally open switch schematic symbol Normally open switch
normally closed switch schematic symbols Normally closed switch
spdt switch schematic symbols Switch SPDT

Schematic symbols for active devices:


transistor NPN,PNP schematic symbols
NPN,PNP transistior
fet N,P channel schematic symbols FET N,P channel 
MOSFET N,P channel schematic symbols
MOSFET N,P channel
darlington schematic symbols Darlington  
thyristor schematic symbols Thyristor  
diode schematic symbols Triac  
xenon tube schematic symbols Xenon tube  



Jump from schematic symbols to
Best Microcontroller Projects Home page.

New! Comments

Have your say about what you just read! Leave me a comment in the box below.



Claim Your: Useful

"Arduino Software Guide"

   Right Now...





Privacy Policy | Contact | About Me

Site Map | Terms of Use



Visit our Facebook Page:

   Click Here



Recent Articles

  1. Easily make an IR Pulse Rate Sensor with one opamp, an Arduino, and a matched Infrared phototransistor and LED pair.

    How to make a Pulse Rate Sensor using a simple single opamp circuit with an Arduino and a few other components.

    Read more

  2. 74HC595

    74HC595 : How to add nearly unlimited outputs to any microcontoller.

    Read more

  3. Using the MAX6675 or How to easily measure Extreme temperatures

    How to use the MAX6675 and an Arduino to measure temperatures from 0°C to 1024°C with two components: A chip - the MAX6675, and a Sensor: - a type-K thermocouple.

    Read more



Readers Comments

"I wanted to thank
you so so so much
for all the information
you have provided in
your site it's

SUPERB and FANTASTIC."

- Ranish Pottath

"This site really is
the best and my favorite.
I find here many useful
projects and tips."

- Milan

bursach<at>gmail.com<

"Awesome site,
very, very easy and nice
to navigate!"


- Matt
matt_tr<at>
wolf359.cjb.net


Learn Microcontrollers

"Interested in
Microcontrollers?"

Sign up for The
Free 7 day guide:

FREE GUIDE : CLICK HERE


"I am a newbie to PIC
and I wanted to say
 how great your
site has been for me."


- Dave

de_scott<at>bellsouth.net

"Your site is a great
and perfect work.
congratulations."


- Suresh

integratredinfosys<at>
yahoo.com

"I couldn't find the correct
words to define
yourweb site.

Very useful, uncovered,
honest and clear.

Thanks so much for
your time and works.
Regards."


- Anon