An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

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0
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2answers
35 views

Two 240-12 V wall warts in parallel through LM2596 buck regulator to increase available current

I have two wall wart 240 - 12 V power supplies rated at 1.3 amps and 1.2 amps. My project uses a couple of solenoid valves, relays, a 12 V pump and some fans. All these will bring peak consumption to ...
1
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0answers
29 views

Would stripping the length of an LED strip change how much voltage and amperage it would use? [on hold]

I am using a 12V White Led Strip and a 12V DC Wall Plug Adapter and soldered everything together. Of course I have to cut the LED strip to match the size I need. Would I need to change the Input ...
0
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2answers
49 views

Constant DC 12V, 2A from USB 3.0, SATA, Molex or other common PSU cable?

I'm in the process of trying to power a simple LED strip lights, spec 12V, 2A, through a PC rather than transformer. So far, I am debating the first stage. After looking into USB 3.0, it can supply ...
1
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2answers
65 views

How to estimate the maximum current provided by a transformer?

I have a transformer that outputs 14.3V (AC of course) and the current in short-circuit is about 13A (made a beautiful spark when I measured it :) ). Can I guesstimate from here what is the 'normal' ...
-2
votes
2answers
47 views

Safe to use a Switching Voltage Regulator to power a Microsoft Surface Pro 4?

Is it safe to use a switching voltage regulator to power a Microsoft Surface Pro 4? I'm specifically concerned with the ripple/noise that produced by this type of voltage converter. Voltage Step Up ...
1
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0answers
34 views

Select power source with a mosfet and no voltage drop

I've 'designed' this power source selecting circuit. VIN is the output of the circuit. VBAT will have a voltage of 3-4.2V when connected. VUSB will have a voltage of 5V when connected. The idea is ...
1
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2answers
133 views

Do I need to use a capacitor to smooth voltage when powering a microcontroller with USB?

I'm trying to make a CNC machine with an Arduino Uno and 3 stepper motors. I plan on powering the Arduino with USB, but I need a 5v power supply for the 3 stepper motor microcontrollers. I couldn't ...
0
votes
2answers
74 views

What happens if the input voltage of a low dropout regulator is under the rated minimum voltage? [duplicate]

I am not that familiar with regulators, so, I want to know what happens if the input voltage is under the rated minimum voltage? Does it give zero volts or something under the rated voltage? If it's ...
0
votes
1answer
62 views

Will the use of an AC relay keep my power supply isolated?

An isolated power supply is used to convert 120 VAC 60Hz power from mains to 12V. A linear voltage regulator then converts the 12V to 5V. A 5V micro-controller is then used to switch on a 12V relay (...
3
votes
3answers
774 views

Will a fuse improve the safety of my non-isolated buck converter design?

I have a power circuit that implements an AC-to-DC rectifier and a non-isolated buck converter to convert a 120 VAC 60Hz signal to 12V and then a linear voltage regulator to step the 12V down to 5V. ...
0
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0answers
23 views

Use wall adapter to replace 8 AA battery pack [duplicate]

I'm fairly new at electronics as a hobby and would like to use a wall outlet adapter instead of a battery pack. The instructions say to use an 8 AA battery pack and I would need an equivalent power ...
-1
votes
0answers
86 views

Car ECU damage due to lightning strike

The car Engine, ABS, combination meter ECUs were found to have damaged. Further inspection revealed that the voltage regulators in the modules were burst/ shows burn marks..is it Possible that a ...
0
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2answers
137 views

Microcontroller to PC via USB - do I need to use isolation?

I want to connect my microcontroller (dsPIC33E) to a PC via USB. Since the particular microcontroller doesn't have a built-in hardware for the USB protocol, I have to use an external chip (e.g. ...
1
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2answers
56 views

Line or Low or High Voltage Twisted Cable?

I understand that telecommunication cables are often twisted to cancel out electromagnetic interference (EMI) from external sources, e.g., crosstalk. Are power cables ever twisted and if so, why?
0
votes
1answer
98 views

Why am I getting electric shock from 12V DC Adapter

May be this is a weird question. But I am little curios to know why my 12V DC adapter is giving shock when the circuit is complete. I purchased couple of these 1 AMP 200V AC to 12V DC adapter. ...
3
votes
4answers
94 views

Why aren't there any 3-phase domestic power-outlets, or any interest in 3-phase for household (mains) power or anything relatively low-power?

Since I discovered what 3-phase electrical power is on Wikipedia, I have noticed that it's associated with very high-power applications. I have not been able to find anything on the subject of 3-...
0
votes
0answers
31 views

What are some good ways of creating a voltage adjusted foldback current limit?

I would like to add foldback current limiting to my bench power supply as a way to protect the DUT from too much current. I believe this will be helpful in certain situations, for example a DUT that ...
0
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2answers
43 views

Uninterruptible Power Supply… 110V AC and low current (60 milliamp)

I have a "smart" lightbulb that requires 110V AC input and uses 7 watts. Due to stormy weather here in Florida I have frequent but minor power outages that last seconds at a time. This smartbulb doesn'...
1
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1answer
23 views

Difference between VDD-VSS and VDDQ-VSSQ pin pairs for SDRAM ICs

I am referring to Micron MT46V16M16CY-5B IT:M DDR SDRAM. In its datasheet, I see two different set of pins, VDD-VSS and VDDQ-VSSQ. What is the difference between them? The datasheet suggests that ...
0
votes
1answer
53 views

How does a powerbank detect a connected USB device?

I got a powerbank powering a raspberry pi over the micro usb port of the raspi. The usb cable I use, has only to lines, Vcc and GND. When the powerbank is off due inactivity and I connect the ...
0
votes
1answer
27 views

Arduino Uno, HC-06 Bluetooth & RGB LED Strip on the same 9V Power source

Hello! I am a complete amateur when it comes to electronics so forgive me for any misconceptions. I am trying to design a circuit that will power an RGB LED Strip (here depicted by a single RGB LED)...
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votes
1answer
63 views

Can I use a 12v battery to power a class 2 transformer (120v input 15v output )? [closed]

I'm attempting to use old computer speakers ( Altec Lansing) and make a mobile speaker system,but I'm unsure if I can connect the transformer that came with it to power it using a 12 v ( small, like ...
0
votes
1answer
33 views

What does “Transient Response Recovery” means in the output specification of a AC-DC power supply?

I'm using a AC-DC power supply to provide 24VDC input to a PCB. A 100uF,35V tantalum is used as one of the filter capacitors for the 24V(same from supply) input of DC-DC regulator on PCB. In some ...
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votes
1answer
66 views

I need help making a power bank

This is the crude schematic I made in paint: http://imgur.com/OAdrVsM I want to know whether this would be sufficient to power a 12v case fan. Parts: Batteries *3 Adafruit Industries Lithium Ion ...
0
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0answers
39 views

Wall-wart blade design [closed]

I am in the process of designing the Bridge Module that updates the time and allows users to control the system remotely. This enclosure will be plugged into a standard 120V power receptacle. I am ...
0
votes
2answers
66 views

Converting 2 pin plug into a 3 pin grounded plug [closed]

I have a portable power socket that accepts two 2 pin power plugs and 1 pin 3 pin grounded power plug. There is a hole on one side of this portable power socket where the wire goes into. Oddly this ...
1
vote
1answer
85 views

Will the use of an isolation transformer improve the safety of my power supply?

I have a power supply design that makes use of a half-wave rectifier and a non-isolated buck Swtich Mode Power Supply IC to step down 120V 60Hz AC power to 12V DC. I then use a Linear Voltage ...
2
votes
1answer
54 views

High Voltage Transformer - effect of increasing frequency

I have a 110 V to 15 kV transformer (60 Hz) which I'm using for high voltage experiments. I need to increase the frequency of the input / output power to be in the kHz or MHz range. Can you tell me ...
0
votes
2answers
75 views

Use of relay 5V instead of 3.3V

We are currently designing a system which will use a relay, a MCU and a sensor (powered in 3.3V with 100mA max current consumption) + a few LED (2.2V type). it will be powered by a 9V battery After ...
0
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2answers
61 views

Help powering an old heater control board im trying to reprogram

Not photo of my specific board. I got 3 old universal controller board's , I'm attempting to reprogram them to learn hardware hacking. But i not quiet sure what would be the best method of powering ...
3
votes
2answers
114 views

Is the output of this LC circuit a DC current?

On the left of the circuit shown below is a 120V AC current. I know that the diode (D1) rectifies the signal so that only the positive half of the AC signal goes through. I have seen circuits with ...
0
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0answers
68 views

Is it possible to discharge a capacitor with linear voltage? [closed]

I want to use (a) capacitor(s) as replacement for a chemical accumulator for permanent delivery of constant voltage 12 V and 5W because I assume it's less vulnerable to fail at a point in time in the ...
0
votes
1answer
43 views

Generator requirement tool accuracy [closed]

I am building the below web application to publish for free in order to help people individuals calculate what size generator they might need in order for their specific needs. My question is whether ...
1
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2answers
55 views

Power supply circuit for powering sg90 servo. How to handle high current requirements?

I need to power a small sg90 servo motor. I could easily use a 5V battery but why bother? :) Aside from this not funny joke, I'd like to put to good use my little knowledge of electronics gained at ...
6
votes
0answers
174 views

Cheapest Raspberrypi (or MCU) power supply with both toggle *and* momentary switches?

Together with a friend we tried to implement the following schematic we found online after a quick search for "simple raspberry pi on/off latch power supply": Then we simulated the above schematic ...
0
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2answers
43 views

Stepping up voltage from solar for a power brick (5V to 15V) possible?

i have a 28mAh power brick capable of charging my laptop when charged. I bought a 28W solar panel which outputs 5V over usb capable of charging ipads etc, however when i connected it to power brick's ...
0
votes
2answers
60 views

Small solar panel + ultracapacitor + zener

I am buliding a very small and low power "intermittent" sensor, powered by a tiny solar panel and an ultracapacitor. It works with a voltage from 1.9V to 3.3V, but the transmitted radio range greatly ...
3
votes
2answers
193 views

Why is there a power drop in a serial circuit, but not in a parallel circuit?

I performed an experiment to compare the power dropped on a combination of a motor (small fan) and a lamp. I got the motor and a lamp from a lab, they are very old and all labels on the elements are ...
3
votes
0answers
73 views

Soft power, latching circuit? [closed]

I'm currently converting an arcade board into a console, and I've been using an original Xbox 360 power supply with it, as it provides 5v and 12v. I thought it would be neat to build a soft-power ...
1
vote
3answers
59 views

Upgrading my ebike battery to give more speed and longer range

I am in the early stages of trying to understand how to do this, so if you're kind enough to reply, please answer in simple terms if that's at all possible. I want to add cells to my electric bike ...
1
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2answers
71 views

Resistance of electronic circuits

I am currently trying to build a Regulated DC Power Supply for an electronic piano. I am trying to find the minimum capacitance that I need to able to reach the desired ripple voltage. To find my ...
4
votes
2answers
94 views

Snubbing DCM (nonsynchronous) Buck converter

FINAL UPDATE: I've posted an outcome report below. I'm very satisfied with how this has come out and I learned a lot in the process. More details and before/after shots in the answer below. Thanks to ...
0
votes
1answer
59 views

Leakage current to heat sink

I am working to lower the leakage current in an isolated power supply. The power supply uses an isolation transformer to step down from 120V/240V to 6.5V. The voltage is then rectified and run ...
1
vote
1answer
60 views

What would be the proper way to wire a female-to-female USB connector

These are really cheap, I know. But I would like to make my own with two USB extension cables. My question is, after stripping off the 2 cables, do I wire red to red, white to white, and so on? My ...
1
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1answer
95 views

Are resistors the only legal way to tie various power designations together?

I'm working with a schematic in Eagle and I use IC's with different types of power pins. I connect VDD to VCC to +5V and I connect GND to VSS to zero volts. When I look at the ERC, I receive warnings ...
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0answers
90 views

Plugging into wall outlets

Im looking for any application notes or resources that detail any safety or component standards that are used for building a power supply that plugs into a wall outlet. I'm an electrical engineer ...
0
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2answers
123 views

Can I power multiple devices from a single power supply?

I'm planning on building a device that has the following requirements: 4x devices that are rated as 5v (1.5 amps normal load, however during high loads can require upto 2 amps) 1x raspberry pi I'...
0
votes
3answers
101 views

Can a board have two power supply circuits?

I have a PCB holding a Video decoder, FPGA and a USB controller, powered by USB3.0. Can I have two different power circuits generate power from same input and deliver to the same output?
17
votes
1answer
808 views

Which glass encapsulated component is this?

I'm trying to reverse engineer this Chinese power supply and I came across this component: Here it is on the circuit board: And here's a close-up: It has a glass packaging, similar to a diode ...
0
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0answers
21 views

What power supply would I need for my 3d printer and how would I connect it to my appliances

I've made my own 3d printer and i'm looking for a suitable power supply. I have 4 stepper motors which each use 12v and 1,5 amps. A heat bed and an extruder which also both use 12v each, but need a ...