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1answer
36 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 ...
0
votes
2answers
5k 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 ...
0
votes
3answers
2k 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 ...
4
votes
4answers
1k 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 ...
3
votes
1answer
317 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
1answer
1k 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
vote
2answers
590 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 ...
-1
votes
2answers
735 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 ...
5
votes
5answers
10k 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 ...
3
votes
3answers
6k 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&...
3
votes
1answer
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 ...
1
vote
3answers
2k views

Can a DC regulator reduce/step down DC voltage?

I have studied that regulators like 7805 are used to remove the ripples present in the DC power supplies. But while searching for information about 7805, I came across the circuit below. The circuit ...
1
vote
2answers
477 views

Positive and Negative Voltage Regualtors

I was wondering whether I could use a negative voltage regulator, specifically a 7905, as a drop-in replacement for a positive one, 7805. On closer inspection of the datasheet, I realized that pin 1 ...