Questions tagged [vcc]
50 questions
7
votes
2 answers
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 current source connected to SW. For this purpose,
a…
DIP4
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4
votes
1 answer
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 library and connect footprints to them. But now, when…
guttih
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2
votes
2 answers
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 R66, R67 and D19.
Why is there a transistor Q10…
Sohail
- 757
- 1
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2
votes
1 answer
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. But the FPGA IC has multiple VCC, VCCA and VCCIO…
F_Schmidt
- 211
- 1
- 10
2
votes
6 answers
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 schema.
Meanwhile i don't understand how flows in…
Muhammad Ikhwan Perwira
- 633
- 7
- 16
2
votes
1 answer
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 only one of these. Please help:
Is this…
bharath
- 238
- 2
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2
votes
2 answers
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.
What does that mean?
Why are the capacitors…
MLuna
- 135
- 5
2
votes
3 answers
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 (page 29, and also inserted below). That is, the…
thisissparzo
- 45
- 7
2
votes
3 answers
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 the VCC pin, that the distance between the inside…
Mike -- No longer here
- 755
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- 20
2
votes
2 answers
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) schematics on the Internet.
What would happen if…
Cristian M
- 241
- 5
- 11
1
vote
3 answers
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 means or vc only means?
Muhammad Ikhwan Perwira
- 633
- 7
- 16
1
vote
2 answers
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 wasn't symmetrical and there must be a positive…
Bob Jordan
- 135
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1
vote
1 answer
What are the names of power supply connectors in this picture?
What are the names of power supply connectors in this picture?
danyal
- 13
- 3
1
vote
1 answer
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. Each pin can carry 2A of DC current.
How much VCC…
c3ncei
- 11
- 2
1
vote
3 answers
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 full output swing of the opamp for any of my rails…
NeverWasMyRealName
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