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Circuit symbols

Circuit symbols. To allow people to document a circuit and everyone to be able to understand it there is a standard set of circuit symbols. These can be draw and connected together with lines to give a complete circuit like the one shown on the right.

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Circuit symbols

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  1. Circuit symbols To allow people to document a circuit and everyone to be able to understand it there is a standard set of circuit symbols. These can be draw and connected together with lines to give a complete circuit like the one shown on the right. This module teaches you what the various symbols look like.

  2. Power sources • The above symbol shows a single battery or cell. When more than one is to be shown, we draw two batteries with a dotted line and write next to it the voltage or number of cells. The final symbol is for a power supply and would be labelled with the voltage.

  3. Resistors • These circuit symbols show various resistors. The above is a standard resistor all of the other resistors add to the same basic shape. • Capacitors & Resonators • The left two symbols are capacitors, the 2nd being an electrolytic capacitor, where the plus sign indicated which way to connect the part.The other two are resonators, the first is a standard resonator and the other has an extra ground connection pin. • .

  4. Logic gates • The 1st logic gate is an AND gate. Next to it is a NOT gate, on this you will see a small circle this indicates NOT. So the original AND gate with a circle on the output is a NOT AND (NAND) the last two are OR and NOT OR gates.

  5. Switches • Here are the symbols for a reed switch (activated by a magnet), a relay and also an opto switch, some times called and opto coupler. • The first two switches are push button switches, a push to make contact and a push to break. The other four switches are toggle or slide switches and show a number of versions from a basic single pole single throw switch up to a double pole double throw switch.

  6. Output devices • These are a selection of output devices. The difference between a buzzer and speaker is that when powered the buzzer outputs a tone at a set frequency, where as the speaker needs to be driven with a square wave. The remaining devices don't need an explanation

  7. Miscellaneous symbols • These are final set of symbols that don't fit into any particular category.

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