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A crystal drawn with two capacitors to ground.
Also known as: Load capacitance marking, Crystal oscillator network
A quartz crystal in an oscillator is nearly always drawn with two small capacitors to ground. They are not decoration: the crystal is specified for a particular load capacitance and the wrong pair pulls the frequency off, which is a common cause of a clock running slightly fast or slow.
Shows the two load capacitors a quartz crystal requires, connected from each terminal to ground.
Contexts: Technical drawing, Electrical equipment
Sets the frequency the crystal actually runs at, since a crystal is cut for a specified load capacitance and a mismatch pulls it away from its marked value.
Contexts: Technical drawing, Electrical equipment
A rectangle between two short parallel bars, with a pair of small two-plate symbols leading from each side down to a ground mark.