Questions tagged [vcc]

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Can VCC be supplied by external power supply?

I've implemented the following 80W PFC boost pre-regulator presented in the following application note. I built the inductor and its auxiliary winding myself with another magnetic core and its ...
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3 answers
264 views

Difference vcc and vc, vbb and vb, vee and ve?

As far as I know, potential difference (voltage), that's mean it needs two point to measure it. Then what does vc or ve only or vb only? If vce means potential between vc and ve? And what does ve only ...
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How to properly link / gather lots of VCC and GND?

I have a system where I have quite a few sensors (more than 10). The signal pins are connected to the Raspberry Pi - but the sensor VCC and GND are not since there's not enough 5V pins. I was thinking ...
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72 views

How to get the Vcc and Ground of a regular arduino charger?

I need to run a Nema stepper motor and drive it using an arduino as shown in this circuit: As power supply I have a 12V universal charger: How can I get the ground and the VCC of my 12V power supply ...
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2 answers
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What is the purpose of this transistor switch on the line providing VCC to this SMPS controller?

In this SMPS for white goods, the VCC pin 5 of U3 (LD7537) is initially fed from AC Mains through R54, R55 and R53 and once started it is fed from the auiliary winding (N2) of transformer (T1) through ...
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4 answers
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What are the usual logic voltage levels in MCUs and other modules?

It's a 100% beginner's question. Assuming that I have a device with VCC = 5 V, is it true that HIGH level will be always something around this 5 V and LOW level will always be something around 0 V? Or ...
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How to handle the DC charge input on the PCB for a symmetrical 5V magnetic charger cable?

I'm working on a low voltage DC consumer product that specifies using a specific magnetic charge cable on the 5V input instead of a regular USB connector. See image: We started out assuming the cable ...
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150 views

How to isolate both Vcc and gnd?

There are three designs of complementary switches, which means that when the button is closed only one of configurations conducts the current and activates the circuit and the other circuit will ...
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1 answer
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eMMC ICs - what VCCQ (dual voltage): 1.70–1.95V; 2.7–3.6V means?

I am struggling to understand what VCCQ (dual voltage): 1.70–1.95V; 2.7–3.6V means. Does it mean that it can be supplied by any of those voltages? Some example ...
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4 votes
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How do I tell KiCad where the power is coming from on a Eeschema

The problem I am a beginner/novice using KiCad and in creating PCB's, so I do not know much about these things. After following tutorials from YouTube I managed to create or copy symbols to my ...
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1 answer
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How can I noise decouple an FPGA with multiple VCC/VCCIO/VCCA pins?

Currently I am working on a small project using a Max10 FPGA from Intel. I know about decoupling IC using a capacitor in parallel and a ferrite in series. This works for a small amount of VCC pins. ...
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1 answer
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What are the names of power supply connectors in this picture? [duplicate]

What are the names of power supply connectors in this picture?
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1 answer
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VCC to ground confusion

I recently reached out for help about uploading Arduino code to a pcb I designed for an LED watch. It was pointed out that I had a couple of errors in my circuit design: “First, R9 should be a pullup ...
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1 answer
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Calculate right number of supply and ground contacts per connector

Just silly question, but not clear for me. For example, I have some device with 20A DC consumption. I have to connect this device to power source by some multicontact connector, 20 pins for example. ...
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4 answers
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Powering 12V 35W halogen bulbs with a constant current supply

I'm revisiting an old project, and I want to see if there is anything I could have done differently, or if I missed any important details or considerations. Basically, I used a constant current driver ...
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2 votes
6 answers
2k views

When we can say 0 and 1 in digital electronic?

I'm confused when seeing wires contain GND and VCC in a schematic. Mainly their flows. I never confused when see in digital logic wires schematic like logic gates. I understand flows in digital ...
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2 answers
159 views

What's wrong with this circuit?

Hello stack community! I've just started to learn about logical gates for my university course. I'm trying to design and run a simple circuit with not gates in Proteus as below: But I'm facing with ...
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Reasons for constraining single-ended Op-Amp VCC when multiple power rails available

If I am utilising an op-amp, say a LM321/LM324, say in single-supply operation as a buffer and have a multiple suitable power rails available then are there, assuming I do not expect to utilise the ...
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1 answer
126 views

DIY op-amp power supply

I purchased a DIY op-amp kit from eBay. The parts arrived in a baggy, I soldered it all together, but have no idea how to wire the power supply? I am hoping to use 9V batteries, and realize I might ...
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2 votes
1 answer
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ts461 op-amp: Vcc and Vdd in datasheet

I thought to use the op-amp TS461 in an audio circuit as a signal amplifier. Here is the datasheet. In the datasheet, for power supply, the pins are Vcc and Vdd. Due to my newbie-ness, I was expecting ...
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1 answer
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HX711 module VCC and no VDD

(Image source and more details: circuitio.io) I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the ...
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1 vote
2 answers
242 views

Why does a IR Transmitter need a VCC?

I'm building a IR hub to control several LEDs stripes, and a projector in a room and noticed that my IR transmitter works even when VCC is not connected. Should I wire it in anyways? Why is it there? ...
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7 votes
2 answers
2k views

How does this circuit start up?

I'm trying to understand how CI HT7A6322 starts up. Relevant part of the datasheet says: Control circuit power supply. Also provides a charging current during start up due to a high voltage ...
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1 answer
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How should I use 3.3V + 5V in KiCad without getting an ERC error?

Below are parts of my design. Using KiCad, I have problems using both VCC (5V) and 3.3V power, both from Arduino Mega pins. If on U6 (flash) I connect 3 and 7 I get a similar error, so I guess I did ...
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Trying to Understand How to connect 74LS173A in Digital Works

A little bit of background first: I found an older application that seems to be very versatile. It is called Digital Works. You can find it here. Within this application you are able to use basic ...
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2 votes
2 answers
273 views

Oscillator capacitors to VCC

I recently came across this circuit in which the oscillator capacitors are connected to VCC and not to GND. Researching I've read many comments stating that VCC and GND are at the same AC potential. ...
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1 answer
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Whats the difference between one terminal power source vs. two terminals power source in circuit simulators?

I found a step down voltage regulator circuit online and tried to simulate it and noticed that it runs when I use the one terminal power source and it doesn't run when I use the two terminal power ...
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2 votes
3 answers
132 views

Possible Error in Microchip Datasheet

I am working on duplicating a product according to the Microchip datasheet. http://ww1.microchip.com/downloads/en/appnotes/00857b.pdf My question has to do with something I found in the schematic (...
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1 answer
283 views

External VCC for USB cable while keeping data connection

I want to connect my android phone and arduino to create a fast and reliable serial connection. I've read that it is possible with USB OTG but i will need to charge my phone eventually. So i was ...
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1 vote
4 answers
307 views

Routing VCC with jumpers?

I'm trying to route a new VHF RF receiver (LO is 151MHz, RF is 162MHz). There's a pair of LC filters on this board, as well as a Si5351 oscillator and a crystal. From what I've read, an uninterrupted ...
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1 answer
324 views

How MCU provides an output to pins [duplicate]

I would like to know how does MCU provide it's output current. here is a little drawing of my assumption (simplified) of how a pin is functioning when it is set to output. Basically it is a ...
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3 answers
5k views

What is PVDD and AVDD?

I know VDD,VCC,VEE and VSS and what they stand for. But when I came across this circuit: I saw this. Those PVDD and AVDD terms? What to do they convey or stand for? This circuit is amplifier circuit ...
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Wire to VDD or GND?

In the circuit below, there are four LTC485 ICs, one input (left), three for output (right). Pins 2, 3 and 8 are going to +5V, as well as GND. So where should I connect them to? Should I wire them all ...
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2 votes
3 answers
473 views

Longest, thinnest trace length to decoupling capacitor before capacitor is effectively useless

I was told time and time again to always put decoupling capacitors as close to the IC pin's VCC as possible. Sometimes when I make complex boards, I try my best to put the capacitor lead so close to ...
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0 votes
2 answers
2k views

Logic Gate Power in Proteus

Can someone explain to me how you can power (vcc, vdd whatever) a logic gate in Proteus, with only the input and output pins being shown? Thanks in advance. The above is the circuit I want to ...
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1 vote
2 answers
1k views

DAC: Vcc or Vref determine resolution?

Does the resolution of a DAC depend on the supply voltage or on the reference voltage? How would the possible voltage levels be calculated if we have, for example, a DAC with Vcc = 5V, Vref = 0.5V and ...
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1 vote
1 answer
86 views

How to connect clean power to multiple pins

I’m more inclined with software than hardware, so there may be a simple answer I’ve missed somewhere. Most of the ICs I’ve been looking at require multiple VCC and VSS pairs such as cortex processors....
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1 answer
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How is this source actually connected in the circuit?

I have seen this way of connecting the source in a couple of books now but I still am not sure if I am getting it right. This is how I am interpreting it, I have a feeling I'm very much wrong. The ...
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1 vote
3 answers
1k views

Vcc decoupling, how to do exactly?

I understand what decoupling is needed, but I did not understand how it is applied. For example, in this scheme that I found, there are many capacitors at the output. (Is a DC-DC converter). Some ...
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-2 votes
1 answer
763 views

Biasing analog MEMS microphone [closed]

I am using a analog type MEMS microphone.(SMA120). Interface chip PCM2912 provi SMA100 data sheet PCM2912a data sheet PCM2912 product page not for new designs Could you kindly suggest me a proper ...
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1 vote
2 answers
528 views

msp430 launchpad PWR led blinking

I want to use MSP430 launchpad to control a switch working between 1.65V and 2.75V. So, I wanted to force Vcc value to 2V instead of 3,3V while it is connected to my PC. I connected Vcc and GND pins ...
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2 answers
4k views

How to identify a VCC pin on PCB use digital multimeter?

I want identify a VCC pin in JTAG header on PCB use digital multimeter. The multimeter is entry-level model without continuity test mode, only Resistance mode and Diode test mode. The VCC voltage is 3....
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1 vote
1 answer
296 views

try to understand ground and power planes

I'm trying to understand how signals flows in the GND layer. Let's assume that I have 4 layers PCB: Signal GND POWER Signal The CPU connect to the GND layer with VIA and I want to know, how the ...
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1 vote
2 answers
3k views

Why are Ethernet jack center taps connected to VCC?

Taking this schematic as an example: EtherTen Can someone explain to me why the center taps of the transformers (TXCT, RXCT) are connected to VCC? I've seen this connection in many (although not all)...
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1 answer
184 views

What are the reasons why this analog to digital conversion is inaccurate?

I am planning to wire up the following sensor to an Arduino or a Raspberry Pi with a ADC. The following segment gives a wiring diagram and than says that "Analog to digital conversions rely ...
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2 answers
639 views

jumper wires better for VCC or ground?

I'm trying to route 10 DIP ICs on a single-sided PCB, but because of my available pcb space, I cannot fit all 10 ICs in one single row. Instead, I lined them up in three rows. It seems that if I ...
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