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

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24 views

Replacing speakers' transformer [duplicate]

I have recently purchases new speakers and I have noticed a slight hum coming from the transformer, therefore I am considering replacing it. The transformer, used to power an internal amplifier, ...
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2answers
33 views

AVR programmer power supply (ISP ATMEGA16 ATmega32 Minimum Board)

In description of an AVR programmer, it is talked about everything except for the input voltage and how to turn it on. How much voltage should I apply to it? Somewhere it has mentioned "DC-005 Power ...
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37 views

switching power supply output terminal

I have a packaged 12 volt switch-mode power supply that has 2 sets of output terminals: I wish to use it to power 5 led strips. Now, does it matter if I connect 2 led strips to one output and 3 to ...
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2answers
29 views

Replacement power supply specs question

I have an old Philips clock radio/Bluetooth/android phone charger with a missing power supply. The device calls for 7v 2.5a with positive center tap. In my junk drawer I have a 7.5v 2.1a wall wart. ...
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1answer
66 views

Parallel connection between distinct DC Bench Power Supplies

I'm using a 30V DC power supply which is said to be 30V/3A with a switch between series/indep/parallel mode. Connecting the supplies in parallel, we have a maximum of 6A. However, in order to execute ...
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0answers
27 views

Power Buffer Supply Splitter - Higher supply voltage

I'm trying to make a simple supply splitter using power buffer. See the image: But instead of LT1010 I plan to use much cheaper and more available L272 (datasheet link: ...
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2answers
67 views

Does transformer humming cause notable waste of energy?

AFAIK transformers hum because alternating magnetic field causes pieces of laminated core to slightly deform and vibrate and that is simply a byprocess of how transformers work. However for the same ...
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0answers
54 views

Why do adapters fail when run on inverters? [on hold]

It may be specific to my scenario, but I have brought more than a dozen adapters of varying voltages from different companies and all of them fail when powered through an inverter, after power is shut ...
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0answers
24 views

Capacitor and resistor in parallel to transformer secondary and bridge rectifier

I have more or less of a reference design at hand (only hardware, no schematic) where a 6k8 resistor in a 2512 package (imperial) and a MLCC are placed in parallel to the transformer secondary before ...
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0answers
16 views

Using (AVR) auto voltage regulator safely [on hold]

May I know if I can safely use my auto voltage regulator rated at 220 volts ac 500 watts to run an electric stove rated at 100 volts ac 650 watts?
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0answers
30 views

ATX Dell PSU to Offical ATX 2.0 spec pinout [migrated]

Hey all I am using an old Dell Precision R5400 which has the 750w hot swap-able power supply. Problem being, since its a dell, the ATX pin layout is different than that of a normal, standard ATX 2.0 ...
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3answers
83 views

Is there an affordable Power Supply capable of 12 Volts and 7 Amps? [on hold]

I am trying to power a pump that requires 12 Volts and 7 Amps to run. I have looked around but cannot seem to find a power supply capable of the voltage and the current. Does anyone know where would ...
0
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1answer
60 views

9V battery is not able to power 2 sensors. How can I do it?

I wanto to power an IR sensor an ultrasonic sensor (HC SR04) and a sound module APR33A3 IC through a 9V battery connected with a LM7805. When I connect my atmega32 to the computer and power the ...
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1answer
52 views

Charge battery when power up, use battery when power down

I have a tiny little esp8266 that runs happily on 3.3V and draws about 250mA and I can make it sleep and use very little battery power at all. What I want to do is use supplied power when possible ...
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2answers
59 views

Mixing two or more AC sources to handle overload

Can I mix two or more AC sources to handle overload and maintain a stable voltage of 230V AC? For example if power from solar panel cannot handle a heavy load can I mix power from different source ...
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0answers
43 views

Quad output PSU

I am trying to replace an 80s era PSU in a synthesizer. It is humming badly due to magnetic flux leakage. Anyway I have tracked down the schematics and I read this to mean that I need a switching ...
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0answers
36 views

Fixing a 600W smps/psu [closed]

I have this smps for quite some time now, it seems to be failing. It used to run my pc on full load with my gpu and now giving me random shutdowns all the time. I am pretty sure its my smps that is ...
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1answer
38 views

Powering ATtiny85 for temperature sensing

I have been working on a miniature temperature sensing module which buzzes once the temperature crosses a threshold using ATtiny85, lm35 and a pico buzzer. When I power the whole circuit using an ...
0
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1answer
64 views

+15V and -15V from a 24VDC Power Supply

Is it possible to get both a +15V and a -15V from a 24V power supply? This is for powering a controller MKS 2179A.
1
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1answer
41 views

How can I make an uninterrupted switch from battery to fixed power for a mobile computer?

I have a computer being powered off a Lipo battery, and I would like the ability to transfer the power supply from the Lipo to a fixed DC source (eg. power supply) without having to turn it off and ...
1
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1answer
59 views

bypass a low voltage shut off [closed]

Is there a way to disconnect or bypass a low voltage shutdown operation? I have a factory made electronic shooting gallery (toy) that runs on 4 AA batteries. I want to run it to a steady 6VDC supply ...
0
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1answer
43 views

Using a multi tap transformer

I'm new to electronics I have need some help with a power supply design I am designing. I currently have a 0-30 volt, 2 amp multi tap transformer that I am using for the above mentioned power supply ...
0
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1answer
50 views

USB power/battery source switch

I'm building a circuit to switch between a USB 5V source and a battery source that ranges from 2V - 3.3V. The rest of the circuit runs on 2V - 3.3V so the USB 5V source is passed through an LDO before ...
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2answers
63 views

Stepping down 12VDC linear power supply to 9VDC

I have a +/-12VDC power supply that I have built up for testing simple audio circuits. It works just fine for me now but I would like to add a permanent +9VDC leg to it. I have never seen a scenario ...
0
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1answer
55 views

125 ma slow blow fuse glow

i have been troubleshooting a guitar amp that blows the 125 ma slo blow fuse upon startup. The fuse does not blow when the amp is brought up to 115 VAC with the Variac. However when starting the amp ...
0
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1answer
44 views

Triple Step-Up Power Supply

I need 5V, 12V, and 30V power supplies for an RF front end tuner. I'd like to power them with a single AC adapter, either 12 or 18V. Obviously it needs to be pretty clean to function with RF. The ...
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1answer
47 views

Transformerless power Supply - 24VDC, 120V AC and 230V AC

I want to know if it is possible to design a power supply for a circuit that can operate from DC and AC using the same input terminals. Thus, the output should be xxV DC (5-24 or whatever is decided ...
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1answer
33 views

What is the name of contractors designing high power supplies with relay logic? [closed]

I have been designing a 3 phase power supply with distribution strip and redundant contactors with failure detection (I posted a question not long ago related to that, it's based on relay logic), and ...
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1answer
63 views

What circuit is used to power up a 3W LED light

What circuit should I use to power up a 3W common anode RGB LED direct from mains (220V)? I am working on a 3W rgb led which has 3 diodes connected in parallel with their + terminal as common anode. ...
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2answers
45 views

Metal Halide Bulb with Instant On?

Is it possible to produce/obtain a metal halide (MH) bulb with the possibility to turn it off and on instantly - again and again? Most MH products require 30+ minutes to restrike.. Why is this? ...
0
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1answer
37 views

Power for 24VDC 5A Motor

I have a 24 VDC 5A motor. I wish to power it with two 12V motorcycle batteries in series for about one hour. Can I hook the batteries up directly or will I fry the motor? Does the CCA of the batteries ...
0
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1answer
32 views

no-load DC output voltage of DC wall-wart circuit

I have this question and I believe the answer is 12.73 from the equation V(N) = V(Rated) * sqrt(2). Is this the correct formula and can someone show me how we arrive at it if it is. I am unsure ...
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2answers
40 views

Latching switch turning back to off on power loss

I can't twist my head around the proper use of my latching switch problem. In detail, the latching (or maintained) switch should switch a 48V DC source power supply for a cisco router. The 48VDC power ...
0
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1answer
53 views

SIM800L power interface

I would like to use SIM800L for M2M. I have power of 5V 2A for powering uC board and would like to add gsm module. It seems that SIM800L has rather strange voltage input rating: 3.4V - 4.4V. What ...
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0answers
23 views

difference between a linear power supply and linear CONTROLLABLE power supply

Since i am new to power electronics (practical) stuff i just want to make sure that my understanding of "difference between a linear power supply (AC->DC) and linear CONTROLLABLE power supply ...
0
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1answer
78 views

Charging capacitor with higher voltage power supply

I have a maxwell 1200F 2.7V ultracapacitor which I charge using a 16V supply and a voltage divider in parallel with the capacitor. It's a really slow charge. I also have a 4V supply which has higher ...
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0answers
12 views

Reprogrammable Remote Power Supply Raspberry Pi Monitor and Control

I currently have a reprogrammable power supply (HCS-3400) hooked up to be controlled remotely from an control/monitor app provided by the power supply company, Manson. The supply is connected via USB ...
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1answer
46 views

What type/topology of SMPS is this?

I'm researching designs for a simple bipolar output switching power supply and came across the design below in a ST datasheet for the MC34063A. However, there isn't enough information in the ...
0
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1answer
41 views

How to wire a RCBO/GFCI correctly (in series with the upstream RCBO/GFCI)?

For one of my projects, I need to add a RCBO/GFCI for the protection of the users. I know that there is a RCBO somewhere up the chain, therefore I am facing a confusion: there is a non-zero resistance ...
0
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1answer
74 views

Floating vs Grounded Source, and Decoupling Capacitors

I am confused about the following: in my lab, we all run electromagnets off of pretty beefy power supplies. Everyone else grounds their supply. Mine is floating. I do not have even a remotely good ...
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0answers
57 views

MC34063 issue. Switches off every cycle

I am using MC34063 in step down configuration but the converter switches off every cycle. Following are the calculations and specifications: Vin - 9 to 12V Vout - 5V Imax - 0.3A Rsc - 0.36 ohms L - ...
2
votes
2answers
104 views

Practicality of this LM317T PWM Voltage and Current control circuit

Ive been trying to design a LM317T power supply with a PWM (Arduino MCU etc) adjustable voltage and current limit. After various circuits, videos and tutorials i have designed the following circuit in ...
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2answers
66 views

reducing mechanical vibration from a PSU

I have a keyboard synthesizer which emits a 60Hz hum due to mechanical vibration of its PSU. The vibration is magnified by the metal chassis of the synth which acts as a soundboard. It’s very annoying ...
0
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1answer
66 views

Why do wall plug power supplies use audible switching frequencies?

Every plug-in power supply ("wall wart") I have ever used starts off silent, but eventually starts to emit high frequency switching noise. It usually happens only when the charger is on, but not ...
1
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1answer
56 views

Pin of micro USB connector in Smartphone

The image below shows a Micro USB connector in a smartphone. I understand what the first 5 pins of the USB are i.e. USB_DM, USB_DP, USB_ID , VBUS and GND. The pin S1 is connected to VBAT (battery ...
0
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1answer
40 views

Switching and protecting batteries from external power supplies

my device can work from external power source as well as from two AA batteries, so voltage in this case is 3V, but external supply is 5v. I need to protect my circuit and power supplies in case of ...
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1answer
60 views

AC-DC Adaptor flashes on & off

i have bought an ac-dc adaptor to power my mini-water pump. When i give power to the pump it start & goes off immediately and it's repeating like that till i plug it off. Adaptors LED is also ...
1
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1answer
57 views

Significance of Vf terminal in Li-Ion Battery

i was going through some propriety schematics that i can't post the battery used in the schematic is a li-ion battery of 3.8V/2.1Ah/ from samsung, which gives out three pins ...
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2answers
62 views

Can I safely substitute a DC converter for the Macbook's AC adapter?

I want to go from this: to this: The converter would be this: http://smile.amazon.com/dp/B00HVCWGNE or something like it. Does this sound safe? The step up converter would be set to a specific ...
2
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3answers
141 views

CR1632 (3v) vs. Two AA's

Kind of a newbie at this, so forgive me if this is a stupid question. I've disassembled a small lifeline alert pendant transmitter that normally runs on a CR1632, can I replace it with two AA's? Are ...