All Questions
Tagged with 7805 power-supply
17
questions
0
votes
2
answers
350
views
LM7805 decoupling capacitors
Would it be possible to replace these combinations of ceramic and electrolytic capacitors with just a pair of low-ESR 10 μF ceramics?
Conversion from 12 V to 5 V, minimal consumption, only MAX485 ...
- 15
1
vote
3
answers
123
views
PIC18F45Q43 44 pin TQFP power supply
I'm working on a project with PIC18F45Q43's 44 pin TQFP package. The PCB I designed had a power supply based on the 7805, but when I power the circuit; the PIC18F45Q43 burns out. I even tried powering ...
- 13
1
vote
1
answer
63
views
External 5V sensors separate 5V regulator , Poly fuse or both?
I'm producing an Arduino project that has two 5V inductive proximity sensors placed outside the project box.
The project is powered by a Meanwell 12V power supply then to a Murata 5V DC-DC converter ...
- 95
8
votes
3
answers
2k
views
7805 voltage regulator reverse polarity
I'm working on a project for which I need to use a 7805 voltage regulator. I feed 9V to its input pin and power a 5V board with the output. However, when the board is connected to a computer, the ...
1
vote
1
answer
531
views
Is it possible to use Ultrasonic sensor HC-SR04 in continuous power-on mode
I will be using Ultrasonic sensor HC-SR04 in water level measurement. I will be triggering the US sensor and getting back the time-pulse from it at very slow rate maybe once every minute. I want to ...
- 1,479
2
votes
3
answers
15k
views
how to fix Heating issue of 7805?
i am using LM7805 whose output voltage 5V and Output Current 1A
i have used this to feed 5V supply for my application Circuit and
my application circuit draw 125mA current ,
even tho 125mA current ...
- 49
0
votes
3
answers
3k
views
How to limit current for voltage regulator/decrease power dissipation?
I need to power a 5V device that needs more or less 1.2A in order to work correctly. I'm using a 13.8V power source with two diodes in series (1N4007) to limit the voltage to roughly 12V. I tried ...
- 3
5
votes
4
answers
3k
views
Reducing voltage drop over 7805 regulator?
I have several projects (clocks) that require 12V and 5V supply. The 5V is for TTL ICs and the 12V powers a SMPS(Switching Mode Power Supply) to give HV(High Voltage) for a tube. The 12V pulls less ...
- 113
1
vote
2
answers
985
views
Connecting the linear regulator directly to AC line
There are several out of the shelf solutions: LR8 from Microchip (formaly known as Supertex product) and NCP785 from ON-Semi. The last one is able to handle up to 700 volts at the input which is ...
- 3,012
3
votes
1
answer
461
views
Choosing bypass capacitors for successive linear regulators
Background:
I am reviewing my prototype PCB to iron out previous issues. The PCB is a Bluetooth data capture unit for liquid levels and flow. I am a software programmer by trade and I have some ...
-4
votes
1
answer
3k
views
How much current does IC7805 device draw? [closed]
How much current does a IC7805 regulator draws, when it drives a 1.5A load?
-1
votes
2
answers
992
views
Please help me to elliminate mistakes in linear power supply design or improve it! (LM723/7805))
So I decided to build power supply unit for my modular synthesizers.
2-in-1 Design: +/-15V (3A each) and +5 (1A) for TTL logic ICs modules.
I started from enclosure, learning the SolidWorks in the ...
- 291
5
votes
5
answers
12k
views
Selecting input voltage for 7805
I generally use switching 12V power supplies for my circuits since they are so common, but I understand the 7805 can take a lower input voltage.
If I gave the 7805 a lower input voltage (i.e. 9V), I ...
- 233
4
votes
3
answers
7k
views
Powering a Raspberry Pi from 12 V DC
I new to electronic engineering and am trying to learn electronic engineering by creating little projects. I have a few questions about powering my Raspberry Pi (5 V DC @1000 mA) from a 12&...
- 469
3
votes
1
answer
1k
views
Servomotor takes too much power so the µController (ATMEGA328P-PU) resets all the time
I have got the following circuit diagram.
For a little explanation. When the button is pressed the µC is powered for about 10 sec. The µC contains code that moves the servo. When the servo is ...
- 628