The 5v tag has no wiki summary.
1
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2answers
57 views
Providing DC power with failover DIY for IP camera
I'm building a simple battery backup box for a 5V IP camera. I've got a few options for battery, sealed lead battery or a mix of portable LIPO style "USB" power bricks. I've seen boards built for ...
-1
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0answers
45 views
MCU 5V to 12V switch [duplicate]
I am new to this and i would really appreciate any help at all
I am making a flasher unit for my car so I am running it off of the 12V cigarette lighter so I have a voltage regulator running my MCU ...
-4
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0answers
61 views
How to Switch My microcontroller that is running on 5v to a 12v led array [closed]
I am making a flasher unit for my car so I am running it off of the 12V cigarette lighter so I have a voltage regulator running my MCU and I would like to run a 12V led array. I heard that I can use a ...
0
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2answers
82 views
Motor not working via transistor
I have a very simple circuit as follows
simulate this circuit – Schematic created using CircuitLab
when the motor is connected in this fashion, the netduino activates the transistor, but ...
2
votes
2answers
126 views
Getting 5VDC from 6V (4S 1.5V AA alkaline batteries)
For my current project, I need 5VDC rail to power an ATtiny85, an RF module, and an Ultra-sonic range sensor, all of which require 5V. 5V ensure that the ATtiny85 can be operated without crystal at ...
3
votes
3answers
152 views
7805 5v Regulator outputting 5.8v? TTL chip not functioning correctly? LED + TTL chips?
I've read a number of other similar questions to mine, but none of the answers have helped me so far. I also don't have any electrical schematic software, so I'm afraid I'll have to explain in words ...
1
vote
2answers
118 views
PC start button effect from electrical point of view
What I basically want to do is to connect one of the digital pins of a network-attached Raspberry PI to (one of) the connectors of the PC Power On button, so that when I issue a command coming on the ...
-3
votes
1answer
192 views
Negative voltage and positive from single 12v battery
I am trying to power my CPU with a single 12v battery.
For 12v,5v,3.3v I have decided to use buck converter using 555...But I can't find any solution to get -5v and -12v out of that same battery.
I ...
3
votes
5answers
487 views
7805 regulator outputting 4v instead of 5v
I followed a tutorial on sparkfun to put together 5v power supply. But for some reason I'm only reading 4v coming out of the regulator. I know it's not the regulator because this is the second one ...
2
votes
0answers
89 views
7805 5v regulator outputting 4v [duplicate]
I'd like to start out that this is my first ever electronics project. I built a 5v power supply from here, using a 7805 5v linear regulator. the only problem is that it is outputting 4v instead of 5v. ...
5
votes
1answer
143 views
Open collectors & 74LVC245
I am trying to interface a PS/2 keyboard to a MSP430 for a toy. The PS/2 keyboard runs off 5V, but the MSP430 microcontroller runs off 3.3V. So I have a 74LVC245 level shifter to convert between the ...
2
votes
2answers
592 views
3.3v input to Arduino digital pin
Is it safe to bring a arduino digital input pin to high on a 3.3v input..from the 3.3v output of the arduino pin?
Because, I need to reset a 3.3v device on one end..and get the arduino to know about ...
0
votes
2answers
163 views
Using a voltage divider on LED IC driver output
Would using a voltage divider on the outputs affect the drivers operation?
The Driver is a 24 channel current sink IC that will be used for automotive interior lighting.
LED will have a Vf of 3.3v @ ...
0
votes
1answer
52 views
LDO LP2992 5V Naming
Some one could explain to me please the difference between the LP2992IM5-5.0/NOPB, LP2992IM5X-5.0/NOPB, LP2992AIM5X-5.0, LP2992AIM5-5.0? They all seems to be the same thing.
4
votes
1answer
362 views
Pogo Pins Schematic
I have a Galaxy Nexus phone which has pogo pins:
I have determined which pins are PWR and GND but I don't know what the third pin is. I assume it is for the dock feature of the phone so it knows ...
1
vote
1answer
149 views
Reviewing an AC dimmer - trying to understand
I'm apology if the title is kinda generic but I found a (on a AC) which use IC and a triac and there is some points I don't really get.
Image from this application note:
Datasheet used as ...
1
vote
5answers
255 views
Interface 5v digital pulses to keyboard contacts?
I currently have the following bit of kit: Photoplethysmographic sensor for measuring heart rate
It outputs a 5v pulse each time your heart pulses. What I need is to do is interface this pulse output ...
2
votes
3answers
377 views
L7805CV 5V Voltage Regulator 1.5A
I seem to be having some problems with hooking up the L7805CV Regulator. When i provide it 12v @2A i seem to be getting an output value of 10.xxV???
What could i be doing incorrectly? Does it matter ...
3
votes
1answer
74 views
LM555CN chip acting weird
I'm in high school computer engineering, and I'm experimenting with the 555 Timer chip on my own. I'm using the Electronic Experimenter Box.
Pin 8 is connected to +5V
Pin 1 connected to ground
LED1 ...
0
votes
2answers
123 views
Automatic ranging level convertor?
I'm designing a PCB based on an ATxmega microcontroller (max. 3.6v tolerant). I plan to connect a range of external 3.3v devices. However, I do have a few 5v devices that I want to connect.
There are ...
0
votes
1answer
156 views
Output two different voltages at the same times
First I'd like to excuse myself for my English, especially when talking about electronics, because I don't always know the correct translations.
I plan to use this Deal Extreme portable 12 volt ...
2
votes
2answers
908 views
read 12V logic pin from arduino using an NPN transistor
I have an inductance sensor on a CNC machine that goes 12V high when triggered (open collector when not) . I want to read that input on my arduino who uses 5V logic.
I was thinking I could just use a ...
0
votes
2answers
901 views
Driving many leds from 9V battery and USB wire
Hello I have 45 10mm Ultra Bright 7000mcd LED's with a Forward Voltage of 3.2 - 3.6 that have a Maximum Current of 20mA Max of 50mA peak for 10% Pulse Width. that came with 50 1/4W 100 ohm Resistor, ...
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3answers
723 views
I2C 5 <-> 3.3V Interface Chip
Does the classical 5V <--> 3.3V bidirectional MOSFET interfacing solution exist as a DIP package? Or is the commopn way to place discrete MOSFETs in your circuit? In that case, what are some common ...
1
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1answer
916 views
Voltage Level Shifting
I know there are similar questions on the site, but I wanted to ask it from a somewhat different perspective.
I've got a 5V device (Device A) that can operate at 3.3V.
I've got a 3.3V device ...
7
votes
2answers
491 views
Convert 5VDC to 400VDC
i'm currently making a geiger-counter and therefor I need to crank my 5VDC up to around 400 VDC, the current is very low, around 0.015-0.02 mA. What would be the best way to generate 400VDC from my 5v ...
1
vote
2answers
150 views
Calculating power requirements
If I have a PCM-9361 Intel Atom board that says it uses 12V power supply and under max power consumption it uses 0.09A - does this mean the board uses 1.08 watts per hour?
Also, the board specs says ...
