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Author Topic: Unknown Schematic Symbol  (Read 2471 times)

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Offline GibborimTopic starter

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Unknown Schematic Symbol
« on: July 28, 2016, 02:16:29 am »
I'm looking over a schematic and I don't know what this symbol means.  It seems to be the voltage clamp on a USB data line.  Can anyone tell me what it is?

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Online Alex Eisenhut

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Re: Unknown Schematic Symbol
« Reply #1 on: July 28, 2016, 02:48:49 am »
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Offline jonovid

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Re: Unknown Schematic Symbol
« Reply #2 on: August 25, 2016, 02:59:06 am »
thermal fuse , maybe  need to see more of the circuit. 
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Offline Pjotr

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Re: Unknown Schematic Symbol
« Reply #3 on: August 25, 2016, 07:13:38 am »
It is simply a VDR, a voltage dependant resistor. De dependence can be positive  or negative, usually indicated bij a "+" or "-" sign near the diagonal line. In general a depndant resistor is represented by a diagonal line through the resitor symbol. What the dependence is can differ, can be voltage: V, temperature: T, light: L etc.

The example given has a wrong symbol. De numbers given actually specifies a zener diode or a "Transzorb" of 5V. Although its behaviour is voltage dependant it is not the same thing as a VDR.
« Last Edit: August 25, 2016, 07:15:13 am by Pjotr »
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