Questions tagged [vcc]

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3answers
48 views

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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1answer
49 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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1answer
33 views

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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1answer
183 views

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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2answers
115 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? ...
7
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2answers
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 ...
0
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1answer
95 views

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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0answers
48 views

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 ...
2
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2answers
185 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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1answer
111 views

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 ...
2
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3answers
103 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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1answer
86 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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4answers
217 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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1answer
174 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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3answers
2k 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 ...
0
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1answer
390 views

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 ...
2
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3answers
161 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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2answers
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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2answers
665 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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1answer
72 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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1answer
66 views

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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3answers
507 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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1answer
535 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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2answers
430 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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2answers
3k 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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1answer
223 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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2answers
2k 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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1answer
152 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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2answers
417 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 ...