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### What is Vee on a 74hc4051 mux? [duplicate]

The 74HC4051 Mux (spec is here: http://www.nxp.com/documents/data_sheet/74HC_HCT4051.pdf) has 8 input/output pins labelled Y, one output/input pin labelled Z, three digital selectors S0, S1, S2, and ...
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### MOSFET symbol - what is the correct symbol

I've been on this site now a couple of months and I notice various symbols used for MOSFETs. What is the preferred symbol for an N Channel MOSFET and why?
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### The various terms for voltage

I am trying to get a handle on some electrical circuit diagrams I've been encountering as I try to get back into electronics and building electronic gadgets. I've encountered a number of terms for ...
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### What is VDD in this context?

On this page, the two versions of this gyro/accelerometer IC have two different Logic Supply Voltages. What is the VDD voltage? Why would one version of the chip also have an option to make the ...
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### Double-Subscript Notation for Voltages

I have read from some book that: "The voltage quantity symbol V sometimes has subscripts to designate the two points to which the voltage corresponds. If the letter a designates one point and b the ...
7k views

### Is VIN the same as VCC?

I have a HMC5883L and its pins are labeled SDA, SCL, DRDY, VIN, and GND. SO I am following this tutorial and it has a VCC pin but mine doesn't have it so I was wondering if VIN is the same as VCC ...
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### Classification of VDD and VSS pins

I am creating a library component for KiCAD using a convenient online app at: http://kicad.rohrbacher.net/quicklib.php. The component I am making is the Microchip PIC24EP512GU814 in LQFP http://www....
3k views

### Eagle Schematic and Board layout design for simple opamp module questions

Hopefully I'm not doing anything illegal, I posted a very similar question a few days ago, but this one is different. Here is what I've been working on the past couple days, trying out different ...
8k views

### VDD and VCC pin naming convention in the IC

My question is to find whether there can be a definitive answer to this particular part. I have Cypress MBR3002 IC which has two power pins labelled VCC and VDD. I got a question from my ...
3k views

### Can I connect vcc to vdd?

I have an USB-UART cable. The connectors listed are Red VCC, Black GND, Green TXD, White cable RXD. I want to connect it to a Alfa Hornet-UB board (http://www.youtube.com/watch?v=i58XOF4Rfc4) with ...
2k views

### Microcontroller VDD and VSS pins are shorted. Does that mean the MCU is fried?

I recently created my own breakout board for a STM32F030R8T6 MCU. The attached image shows the PCB that I designed for it. There are no components, only top copper tracks that get connected to header ...
675 views

### Newbie: ATmega32u2 USB-powered - how to ground?

In ATmega32u2's reference manual, there's a diagram for USB-powered application like shown below. Should I, or should I not, connect the GROUND to VSS/UVSS line? And why? If not, then what to do, ...
989 views

### What are Vcc and GND on a shift register?

What are Vcc and GND on a shift register? I thought that I had to provide a positive voltage to the IC via the Vcc, but turns out that I can operate my shift register without powering the Vcc. ...
I'm following the design of a circuit requiring a power supply to provide something the author calls virtual ground, $V_{gnd}$. The circuit look like this: However, I'm using KiCad for the design ...