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

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13 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'...
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1answer
20 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 ...
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1answer
45 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 ...
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1answer
18 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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1answer
48 views

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

I'm attempting to use old computer speaks and make a mobile speaker but I'm unsure if I can connect the transformer that cam with it to power it using a 12 v lawnmower battery,
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1answer
29 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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1answer
58 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 ...
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0answers
38 views

Wall-wart blade design [on hold]

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 ...
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2answers
61 views

Converting 2 pin plug into a 3 pin grounded plug [on hold]

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 ...
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1answer
71 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 ...
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1answer
49 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 ...
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2answers
69 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 ...
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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 ...
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2answers
110 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 ...
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0answers
67 views

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

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 ...
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1answer
42 views

Generator requirement tool accuracy [on hold]

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 ...
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2answers
47 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 ...
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0answers
136 views

Cheapest Raspberrypi (or MCU) on/off power supply latching issues

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 ...
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2answers
42 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 ...
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2answers
57 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 ...
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0answers
35 views

power supply 12volt 1.0 amp [closed]

I need some advice on a upgraded 240volt power supply please. I need a 12volt 1.0amp power supply to power a very expensive set of electronic scales and have found several on the net ranging between $...
3
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2answers
188 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
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0answers
61 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 ...
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3answers
57 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 ...
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2answers
69 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 ...
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2answers
90 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 ...
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1answer
57 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 ...
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1answer
59 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 ...
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0answers
38 views

Can a power bank be customized to give output of 3 and 4 amps instead of 1 and 2.1 amps? [closed]

I would like to know if in any case a power bank could be designed/customized that could be easily charged with normal micro usb charger 5v DC , that could give out the power in 3 and 4 amps instead ...
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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89 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 ...
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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'...
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4answers
99 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?
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1answer
796 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 ...
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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 ...
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0answers
75 views

What's wrong with my SMPS circuit?

I've proto-typed a switch mode power supply with variable voltage and current control using a MAX1763 IC. I've powered it on and for the most part it works great, I can control the voltage using the ...
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1answer
55 views

24V AC converter to 12V DC at 1.2A

I am facing annoying troubles converting 24V AC to 12 V DC. The goal is to supply 1.2A current to 12V DC load. I am both limited in input power (I can only use 24V AC output of a transformer that can ...
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2answers
51 views

Multiple 12V devices with one power supply

On my workbench, I have many 12V devices, each with a small wall wart power supply. I'd like to buy a single, larger, power supply, and build a simple parallel circuit to power them all. I don't want ...
2
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1answer
47 views

How to interpret the PMBus response delay time value?

EDIT: I should make it clear that I am asking in terms of creating the PMBus firmware for the device rather than attempting to program the device using PMBus commands. In section 10 The PMBus ...
0
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1answer
54 views

Can I replace D cell with AA cell in an electric train?

I have an electric train powered by 2 D cells. But they are quite cumbersome and I have only AA charger and a bunch of good quality AA rechargeable batteries. So I want to tweak my electric train and ...
0
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1answer
37 views

Bipolar Li-ion battery charger

I'm currently designing a small application with a bipolar power supply. As the circuit needs to be portable, I've included two Li-ion batteries in series with the midpoint grounded to generate the ...
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3answers
89 views

Does a helicopter battery drain when it is “off” but attached to a battery hot bus?

I'm reading about the DC Power System for a civilian helicopter. It shows the following diagram for when the battery is off: However, it shows that the ...
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3answers
38 views

L200c power supply, pot won't go down to 0 ohms

So I'm trying to make a power supply using the L200 regulator. I'm using the circuit in Figure 1. Programmable Voltage Regulator with Current Limiting. I made the circuit after that design. Except ...
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2answers
94 views

How is this device getting low voltage?

I've opened up a Lutron dinner, and I'm trying to understand how the microprocessor gets its DC voltage. With my limited knowledge I'm not seeing an AC/DC converter. I've attached pictures, can ...
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0answers
66 views

I'm seeing AC voltage on a DC power supply

A little bit of context: I'm working on my 3D printer (Kit build, modified) which has an aluminum frame. The main power supply is enclosed in an aluminum housing, which is bolted directly to the ...
1
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1answer
42 views

multi-tap transformer relay for LM317 tips

Example circuit: Since LM317 is a linear regulator it will get very hot when i try to draw around 1 amp @1.25v with a 24v input. The transformer i have at home have these taps: 24v 12v 5v Is it ...
2
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2answers
86 views

Powering MCU from both USB or Battery

I am developing a board that will need both USB and battery power options, non switched. I put this schematic together that I think is right, but I want to make sure I'm not going to blow the chip. I'...
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2answers
28 views

EU power adapter for UK laptop

My laptop uses a standard clover-leaf 240v 3A UK power lead. I bought a "laptop power lead" for use in Europe. However, it seems to be rated for 16A, is this normal or is it overkill for use with my ...
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1answer
50 views

Current and wattage overload

So, I have an extension cord reel with four outlets and current overload protection can handle a total of 2500W, 110V, 20A. Im confused about those specification because they do not add up but that's ...
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0answers
51 views

TPS560200 - Output voltage wrong

One of the students at my uni has laid out a PCB with a TPS560200 step-down converter. However, instead of 5V it only outputs 0.9V. I've checked the feedback resistors and they are correct*. The ...