It keeps a fixed voltage across its terminals. The Zener diode (abbreviated as ‘ZD’) is a special diode. The LED is more efficient than many other light sources. It is a type of transducer that converts electrical energy or electric current to light. The LED is abbreviated as a light-emitting diode. Most we use them in the rectifier and protect backward current spike. The electrical current will flow through the diode as one-way valves. Often see them it RF transmitter circuit and more. We adjust a capacitance with a small screwdriver or other tools. Often we use this kind in a radio receiver turner and transmitters. We can change the capacitances of variable capacitors by rotating a rod the plates inside them. Or block DC signals but pass AC signals as well. It can also use it in a timer circuit by adding a resistor. The positive (+) or minus (-) lead of a polarized capacitor is always marked on the case. If you reverse the connection may damage the capacitor. It can also to block DC signals but pass AC signals.Ī Polarized-capacitor stores electric charge, too. We called a dielectric.Ī capacitor is used as a filter, with a resistor in a timing circuit. It includes two conductors plates that are separated by an insulating. We can use it as a transducer converting position (angle of the control spindle) to an electrical signal.Ĭircuit Symbols: Capacitor Circuit SymbolĪ capacitor (Abbreviated with ‘C’.) stores electrical energy. We mostly use the resistors to divide a voltage into a smaller voltage.įor example, a resistor is in series with a LED to limit the current passing through the LED.Ĭircuit Symbols: Potentiometer Circuit SymbolĪ potentiometer or pot trimmer (abbreviated with ‘POT’) is a type of variable resistor with 3 contacts. Resistors (abbreviated with ‘R’)resist the flow of electric current. But for mains electricity and some radio circuits, it really means the earth. It is also known as ground(Abbreviated as ‘GND’). In many electronic circuits, this is the 0V (zero volts) of the power supply. And, most used to step down (decrease) AC voltages.Ī steady (DC) current will not be transferred from one coil to the other. We can use transformers to step-up (increase) AC voltage. There is no physical connection between the two coils. Which usually wrapped around an iron core. It includes two more windings, the primary and secondary. We often use a transformer(Abbreviated as ‘T’) as an AC voltage source. If the current flowing through it exceeds a specified value. The Fuse(abbreviated with ‘F’)is a safety device. Normally Closed Push button Switch or Push-to-break switch ON-Off-ON 3 Terminals, 3 Position SPDT Toggle Switch SPDT switch (Single Pole Double Throw Switch)ĭPST switch (Dual Pole, Single throw Switch) And sometimes we can use it to select different parts of a circuit.Ī simple on/off (single-pole, single-throw, or SPST) switch. By the way, when using the AC line as the left symbol.Ī switch can turn the power on and off. Often I use a middle symbol is the AC voltage source. It is the main electrical energy in our house.ĪC = Alternating Current Supply, continually changing direction. And, the negative supply is the negative (-) voltage Connection. The positive supply is the Positive (+) voltage Connection. Also, the current will always flow in one direction. Often we use a DC power supply to the circuit instead of a battery. The positive terminal of the battery is always at the top and is the longest line on the battery symbol. The cells are energy or power supply for a circuit.Ī battery (Abbreviated as ‘B’) is Supplies electrical energy. I use two Wires Not Joined Circuit Symbol.įor the beginner, I choose the second symbol it is clear to look like a bridge cross river. It is VERY IMPORTANT to show lines are NOT JOINED. When the wires or lines may not touch or cross each other wires. Remember when wires joined you must put a dot. it is best to place a dot on the connection to PROVE the lines are joined. They are joined together called Wires Joined Connection. When we connect the devices with other wires. In a diagram called CIRCUIT DIAGRAM, the wires are drawn as lines. All electrical and electronic components need wire to connect them to the circuit. We use a wire to connect the electronic components to each other. But I think most people can understand them. Thus, some circuit symbols are not approved as a standard symbol. So, I add colorto make it interesting and different. I love both the EU/IEC style and the US style. Since I want to design some symbols to be a difference of standard symbols. You can click on each link to read more detail. Look at these symbols for different electronic devices below.
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