symbol [~]
I am trying to design a circuit in Multisim and I am stuck on identifying the part circled in red. What in the hell is that? My initial thought was that it was a component that tells the Sensor circuit the charge percentage of the potentiometer Thanks 🙂
I'm not aware of a standard symbol for a pressure sensor.
Usually, it's drawn as an IC.
It's a good idea to indicate in the schematic that this is a sensor, and therefore something special. You can make a text block next to the symbol saying what the sensor is sensing. If you know what kind of sensing element the sensor is based on, you can draw an icon of the sensing element in the schematic symbol. If it's a MEMS pressure sensor like yours, you can draw a bridge on it. (Another example. If you know that some other sensor is based on a phototransistor, you can draw a phototransistor on it.)
None of those look like a thermistor symbol to me. The usual schematic symbol looks like this:
or this:
Depending on whether the origin of the schematic is US/Asia or Europe respectively.
Edit:
Since it's an LDR- no the direction the light is coming from does not normally make a difference to the understandability of the schematic. It's a schematic, not a pictorial diagram. However, in the case where there is a light source closely coupled to the LDR which is part of the same schematic, it's common to show them together as below:
The symbol shown in the above schematic is the one most commonly used in North America and Asia. The European symbol appears to be more like yours.
Best Answer
A "voltage reference" is a device that provides a precise voltage to be used as a calibration source, in this example the + input of the op-amp (adjustable in this case using a potentiometer).
When a potentiometer is included, it is usually a precision one with 10 or 20 turns, and a test point would be provided on the wiper lead to measure the voltage with a digital voltmeter as the pot is adjusted.
References are different from power supply rails (e.g. 5v or 3.3v) in that the voltage is more tightly controlled, and is not subject to the spikes that usually show up on voltage rails. They usually have a limited output current, such as 10 ma..
Here is an example of a family of voltage references that includes a 10v source with a 0.1% accuracy. Note some of the values look odd, such as 2.048v and 4.096v; these are designed to provide a voltage reference for devices like a DAC, which may have 11 or 12 bits, and thus map directly so 1 bit equals 0.1 mV.