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.
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Resistors |
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Thermistor or temperature dependent resistor |
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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. |
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Variable resistors Proper panel mount units with a metal or plastic spindle - plastic is easier to cut. |
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Light dependent resistor |
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Capacitors |
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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! |
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Variable capacitors These are the ones on a transistor radio 265pF (or larger for older radios). |
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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. |
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Inductor |
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Diode |
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Zener Diode |
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Diac |
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Bell |
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Buzzer |
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Fuse |
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Lamp |
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Loudspeaker |
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Microphone |
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Transformer |
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Crystal |
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LED |
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Light detecting diode |
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Volt bar
(power supply) |
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Chassis GND |
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Normally open switch |
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Normally closed switch |
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Switch SPDT |
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NPN,PNP transistior
|
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FET N,P channel |
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MOSFET N,P channel
|
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Darlington |
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Thyristor |
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Triac |
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Xenon tube |
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