Questions regarding 5V level signals, level-shifting, and circuits.
0
votes
0answers
24 views
DC-DC step up and step down converter for a solar panel
I have a 1W solar panel that will output about from 0 to 7V (7V in full sun). I want to power up a small USB gadget with it. I need a device that is a step up converter when panel's voltage is under ...
0
votes
1answer
33 views
Connecting the Beaglebone Black to the KK Mini flight controller
The flight controller needs to be sent 4 PWM signals at greater than or equal to 5 volts. Since the Beaglebone Black(BBB) GPIOs can supply only 3.3V I needed to change the signal from a 3.3 volt one ...
0
votes
2answers
54 views
Help with Texas Instruments SN74LVT125
I am interfacing a 5V system to a 3.3V using the SN74LVT125 to shift down TTL voltage to 3.3V
My problem or my question is, Some of the input pins (the A ones) are being triggered by a 5V signal that ...
-1
votes
1answer
51 views
DIY car phone charger
I am converting a wheelchair access vehicle into a campervan. Having removed the old wheelchair ramp lift mechanism, I'm left with a couple of 12V cables in the back.
I'd like to turn one of these ...
0
votes
1answer
56 views
Level shift from 5V to 3.3V (and vice versa) using 74HC4050N,652
Below you will find a link to the datasheet for 74HC4050N. My order I placed had a suffix of ",652" on that part, but I'm not sure what that number refers to.
http://www.nxp.com/documents/data_sheet/...
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votes
1answer
46 views
Powered USB hub
I would like to know if the bellow montage is going to work. I will try to convert a cheap USB hub for a raspberry pi zero.
0
votes
1answer
30 views
Why dc motor is buzzing when using it with XL6009 converter?
I have the following scheme RPI, L298n with 6v DC motor. I'm trying to add a XL6009 boost converter but set to boost 5v into 6v but sometimes the motor is rotating and sometimes is buzzing. Does this ...
0
votes
1answer
52 views
3.3V to 5V logic converter using p-channel mosfet
I am trying to convert a 3.3V logic signal to 5V logic signal. I am using a p-channel MOSFET and I can not get it to send the full 5V signal through. Below is the circuit I am using.
1
vote
1answer
56 views
what size cable for powering an LED sculpture?
I've got four 60 amp 5 volt power supplies, and I'm sending power to a sculpture with 3000 RGB leds. So here's the total power picture we're looking at...
3000 * 5 volts * 3 leds per pixel * .02 amps ...
0
votes
0answers
43 views
Pressure sensor voltage climbs then drops steadily with increased pressure
I have a few pressure sensors on a high pressure (3000 psi) system powered with 5V DC. These sensors are three wire type sensors but I don't know much more than that. Some documentation indicates ...
0
votes
2answers
43 views
12 volt switched by 5 volt
I have an issue with 12 volt DC LEDs installed on a 5 volt DC circuit. Switching must be performed as close to instantaneous as possible.
So I searched around but nothing would do what I need. I ...
0
votes
1answer
48 views
DC Jack Adapter for 5V 2A Wall Wart
Below is a wall wart with ratings 5V 2A. I'd like to buy a DC adapter of some kind for this wall wart, so I can easily wire things to a circuit or bread board. What is the name of the DC side of ...
-2
votes
2answers
78 views
Need to obtain a 1mV signal
I have a 5V power source. For one of my op amps (LM358) I need a 1mV reference voltage as i am comparing it against a sensor input (greater than 1mV). This will allow LM358 to allow my Vcc voltage to ...
0
votes
3answers
63 views
Simple USB powered PIR sensor with LED attached to it (no arduino)
I'm new here and I'm re-new in electronic hence why I'm seeking for some help. Last time I touched a breadboard with a transistor was 10 years ago.
So, here's my problem and the problem to the ...
0
votes
3answers
95 views
voltage of input(+5V) is greater than the supply(+3.3V) provided for 74HC245 buffer
In my design I am using 74HC245 buffers between a input signal of +5v and controller pins of +3.3V. What is the supply value I have to use for buffer (74HC245). I want to use +3.3V as the supply, but ...
-1
votes
2answers
48 views
5V stepboost low voltage [closed]
i have two 5V stepboost modules from Ebay, however they are quite poor. Blue can provide atleast 1.45W, but the green one, is the worst - can provide only 0.09W, and i noticed, after two minutes ...
0
votes
1answer
44 views
Solid State Relay from CMOS pin
I want to operate the LCC110 solid state relay from a 5V CMOS output pin on the PGA2505. I can see that I will likely need 8mA to drive the relay. However, I don't see on the PGA2505 datasheet if it ...
2
votes
1answer
77 views
Power Efficiency of Embedded system
I am designing an embedded system and I am hoping to achieve maximum power efficiency as the system will be running off of 2x CR1620 batteries. In addition to power efficiency, I would like to keep ...
0
votes
3answers
60 views
12V motor controller + 20V sensor
What I am projecting is to substitute the manual throttle for a little electric motor with an Arduino computerized one based on two sensors that yields 0-20V.
But Arduino works with 5V, so I need a ...
0
votes
2answers
68 views
Ambient LED Project
I'm working on mounting LED strips to my entertainment set up and part of it involves mounting strips to the back of my TV. I want to power the LEDs via a USB port found on the back of my TV. I'm ...
0
votes
1answer
58 views
Arduino pushbutton max cable length
i have a question regarding cable length for a pushbutton in a home automation project.
I would like to have some light switches (regular switches from home shops) connected to my arduino - so 5v - ...
0
votes
3answers
102 views
Controlling 5V Pushbutton switch fails with Triac
I have an external consumer product what I try to automate by connecting my Arduino to its push buttons. This device uses internally 5V, I can get this voltage on the switch buttons as well.
My ...
0
votes
2answers
232 views
How to output 5V from 3.3V MCU?
Big picture: I want to control a LUXdrive 3023 BuckPuck LED driver (3023-D-E-1000) from a Particle Photon (essentially an ARM Cortex M3 microcontroller). The MCU runs at 3.3V. I have tried a few ...
0
votes
1answer
60 views
555 timer digital clock
How would you go about connecting a 555 timer to a circuit with a 16x2 LCD display, which is already connected, to create a digital clock that counts the time? Do you have a sample of how this code ...
0
votes
1answer
74 views
LM2576 12V to 5V and 3.3V
I want to step down the input voltage from my power supply (12V) to 5V and 3.3V.
Please see my schematic. Is it right or wrong?
I use LM2576 as switching regulator.
Thanks. Sorry for noob question
0
votes
1answer
62 views
Optocoupler delay off MOSFET solenoid
This is to trigger a 12v solenoid (acting as a laser shutter) with 5v (JP2) thru an optocoupler.
The problem is 5v line have bit fast interruptions on a laser show, so I'd like to add a bit of delay ...
0
votes
1answer
74 views
How do I connect the wires on a PC Power Supply that supplies +3.3V, +5V, +12V, -12V, and +5Vsb to make 15 Volts for Peltier module?
I've selected the Corsair CS450m as the PSU. I also found a 12V DC 30A 360W Switching Power Supply on eBay for about $54 AUD (I'm not allowed to show the link), but I wouldn't know how to get it to ...
0
votes
1answer
58 views
How does a Rotary Encoder work without connecting it to 5V
Like in this picture:
I know we can hook 5v later externally to debounce but still, i heard it works without debounce circuit even if its bouncy. But how can it send signals if there are only output ...
0
votes
1answer
36 views
Adding an optional external supply
I'm a electronics hobbyist and I have an old computer, a VIC-20, that I like to build hardware peripherals for. The computer's logic runs on 5V and there's a user port which can supply up to 100mA at ...
-3
votes
4answers
181 views
I want to have a 9v battery to give a 4.5v - 5v power supply? [duplicate]
I am trying to download a program on to my PIC circuit. As you know the pic isn't supposed to operate with anything larger than 5v. I don't have any access to a battery pack which could hold 3 x AA ...
0
votes
1answer
73 views
What is the methology of sending signals via Bi-Direcional MOSFET?
I am trying to make a simulation by using Multisum 14 for i bi-directional channel for Logic level circuit from SparkFun which use Philips AN97055 IC as a Bi-directional level shifter...
My circuit ...
0
votes
1answer
145 views
What is that meaning of “This Sensor uses 5v as a working Voltage only”?
I am trying to understand the meaning of a 3.3v or 5v IC but I don't know how to use the right keyword in search engine to find the explaining article so I'll explain...
We know Arduino UNO R3 as ...
0
votes
2answers
127 views
Need some help to design power supply for custom Arduino PCB [closed]
I am building a custom Atmel Mega 2560 PCB that will run off the 9V 600mAh rechargeable li-ion batteries in a bus. I need to supply - 5V for MCU and other components in PCB, the overall current ...
0
votes
2answers
71 views
Package impact on ICL7660
I am using the ICL7660 charge pump IC to generate a -5V supply from a +5V. When using the IC on breadboard with a DIP package (ICL7660CPAZ), with two 10µF electrolytic capacitors, it works perfectly ...
0
votes
3answers
2k views
How do I use a 5V relay with a 3.3V arduino pro mini?
I'm using a couple arduino pro mini's (3.3V) for a home automation project and want to add relays to the final PCB design to switch some stuff on and off.
Since I want to use a 5V relay like this: ...
0
votes
2answers
287 views
Safe way connect a 3.3V output to an input with weak pullup to 5V
I plan to connect a 5V IC to a beaglebone black(explicitly not 5V tolerant 3.3V IOs). For signals going to the beaglebone black I need a level shifter.
But the input of the 5V IC has a weak pullup ...
0
votes
1answer
100 views
Connecting Sharp GP2Y1010AU0 (5V) to ESP8266 (3.3V) - pin nr 3 - do I need transistor?
I'm connecting Sharp GP2Y1010AU0 to WiFi module ESP8266.
Sharp GP2Y1010AU0 is powered by 5V and ESP8266 by 3.3V.
I wonder if I need a transistor between Sharp's pin nr 3 and ESP8266?
If yes, can it ...
-1
votes
1answer
54 views
What is my capacitance? [closed]
I have a current measurement of 300mA on an MCU evaluation board. If my power supply is 19V or 12V what capacitance do I need to use in order to limit the voltage fall to 5V?
0
votes
2answers
104 views
74HC76 integrated really use Vcc pin?
I'm building a simple ring counter with two jk flip-flop. I'm using 74HC76 integrated that contains two jk.
This is the ...
1
vote
0answers
87 views
Arudino Simulating Button Presses on Keyboard
I am currently working on a project that involves automating an old Automark Indenting Machine. I want to be able to use an arudino to read a csv and then simulate pressing the keys of the keyboard ...
-2
votes
2answers
276 views
3.3V from 5V Voltage regulator
I wish to build and get 3.3V from LM7805 voltage regulator with some extra parts like resistor and maybe a zener diode.
How can I achieve that, is it even possible to do that?
1
vote
2answers
98 views
Does 3x22μF mean three capacitors of 22μF in parallel or series?
In the following schematic (TPS63061) several capacitors are denoted as multiples. As a newbie I am unfamiliar with this notation: does 3x22μF mean three capacitors of 22μF in parallel or series?
...
3
votes
1answer
182 views
Raspberry PI UPS
I needed solution to keep Raspberry PI B+ running in case of power loss. So made following power backup circuit:
It works, however, when it runs from battery, a bit too much voltage is dropped in ...
0
votes
1answer
123 views
Stepping down 12V to 5V without amperage loss [closed]
I'm building a LED wall but I'm having trouble finding a suitable PSU. I need a 5V one but all I can find are 12V 30A which if converted to 5V would be perfect.
My question is, is there a way to buck ...
0
votes
1answer
143 views
Driving 4.2V TFT by 5V
I have a nooby question:
Is it within the range of tolerance to drive a TFT (car electronics 4.3 inch low cost type) which runs on 4.2V internally (12V DCDC-converted to 4.2V by an 'XL1509 adjustable ...
0
votes
1answer
68 views
Powering 25 x 5 volt 1.5 amp devices
I’m working on a project that involves 25 individually powered Arduino Nanos with mp3 playing capabilities, each hooked up to a 3W speaker. The devices need 5 volts and around 1.5 amps to run ...
0
votes
1answer
77 views
The best use of battery power
My project involves a number of components. Some are 3.3v and some are 5v
The project must be powered by 8 AA batteries.
Most of the time the components will be in a low power state. But they will ...
1
vote
2answers
732 views
LNK306 5V 300mA
i need a small and cheap power supply.
I found the LNK30x Family but i dont know how i have to change the values in the sample circuit to generate 5V 300mA output.
Found also this design Guide http://...
2
votes
1answer
609 views
which is better? 5V or 3.3V as the supply voltage
I am about to design a new microcontroller based project. I checked all components (few) and all can operate at 3.3V or 5V. the microcontroller itself can also operate at 3.3V or 5V (pic micro at only ...
0
votes
1answer
114 views
5V charging through ATX PSU? [closed]
I've an ATX power supply and I'm trying to charge my Nexus 5 phone.
I connected USB female (from an old PC) to +5V and GND and shorted the DATA+ and DATA-.
My multimeter shows 0.400A when I connect my ...
