Questions tagged [power-supply]

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

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32 views

li-ion battery protection circuit

My goal: To operate a cellphone using a bench power supply in place of the cellphone's Li-ion battery. To this end, I removed the battery from the phone and de-soldered the anode and cathode posts ...
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29 views

Capacitors bridging over transformer in insulated power supply

I need an isolated power supply for powering a device that’s very sensitive to current leak (see below). I bought one such isolated power supply from Aliexpress. What surprised me is that there seem ...
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57 views

Positive-negative voltage from dual supply

I'm trying to build a low cost hifi (Hiraga Le Monstre) but I have two old computer PSUs at hand so I tried to use it as power source. The Monstre needs +12V and -12V, computer PSUs have both, but the ...
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Converting a circuit/ schematic onto a breadboard? electronics basics

I need to produce a complete breadboard for my coursework but due to missing school (leg injury) I don't understand how to convert my circuit/schematic into a breadboard after trying to look online I'...
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37 views

Thermal Resistance of PSU's heat sinks

I have a non functional PC power supply unit, and I would like to keep its heat sinks, but they have no model or part number in them. Is there a way to estimate, calculate or measure their thermal ...
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60 views

Raspberry Pi UPS circuit review request + improvements

Based on this question I created the following circuit: Since I made some (component) changes, first I would like to have a validation of the circuit for long-term usage (and some improvements). ...
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2answers
59 views

Leakage inductance is function of the air gap

I would like to know why leakage inductance is function of the air gap transformer. How does it influence the leakage flux ? What is the relation between them ? Thank you very much :)
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81 views

Is building a DC-DC PSU PWM controller from discrete components a terrible idea?

I am building a 1kW PSU that is controlled with DSP MCU. It requires a lot of features such as synchronous rectification, bidirectionality, current regulation. Those features make the PSU very exotic ...
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56 views

How the electric water heater and stove works? [closed]

I notice that some appliances have heating elements such as electric stove and water heater. I know that both of them using heating elements maybe some type of a resistor or something. I want to know ...
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42 views

Defining power supply current specification

Let's say I'm designing a power supply with input 120-600VAC and output 48V/100mA DC. The load for the 48V output is: A 3.3V switching regulator Two LEDS (~2 mA each one) An ultra low power ...
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32 views

How do I read this simple power specification? [closed]

I'm trying to choose the right power supply for an induction charger with the below specs. It's very easy to find 5V 2A AC chargers, but I am not sure if that will supply the amount of power I need. ...
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27 views

Power supply filtering RCL-filter vs alternatives (for LF-RFID driver)

simulate this circuit – Schematic created using CircuitLab This schematic is the manufacturers dev-board design for the RFID-IC power Supply, using a large power inductor at 4A I_RMS and 22uH. ...
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Suggestion on Power supply design

I am looking for Transformerless power supply design. I have MCU 5V. and would like to drive 12V/24V relay with single LED. i have 4 pots 10K/200k for timing So i prefer 230VAC to 12V/24Vdc output ...
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80 views

Is there a simple circuit that can change the AC output voltage from a transformer or AC-AC power supply?

I have a device that requires 9V AC and rated for 2.1 amperes. I thought I could modify the output of either of the following voltage supplies to meet those values: A power transformer that outputs ...
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1answer
96 views

Linear regulator heats up at 60 volts

MY goal is to design a regulator which could receive (12 V to 60 volts DC as an input) and 5 volt with 60 to 70 mA current as an output. The reason I used three BJT's NPN (Q1, Q2, Q3), so I thought I ...
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Can I still use this power supply if I clean off the rust from the transformer?

I have power supply for a vintage Timex Sinclair. The unit was sealed but the cable felt loose so I pried it open to inspect the connections. There was a knot on the other side so it was just the ...
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37 views

Power supply output voltage drift with temperature

The PSU that I've built, output voltage is drifting when it's turned off; First set values: Turned it back on again after 10 hours: The values being read using a 16 bit ADC and is spot on. The ...
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1answer
23 views

ts461 op-amp: Vcc and Vdd in datasheet

I thought to use the op-amp TS461 in an audio circuit as a signal amplifier. Here is the datasheet. In the datasheet, for power supply, the pins are Vcc and Vdd. Due to my newbie-ness, I was expecting ...
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1answer
51 views

How long will a 32v 15A (500Wh) e-bike battery last outputting at 5V 1A?

I hope it's okay to ask this here My e-bike has a Lithium Ion battery (32 Volts, 15 Amps), and it has a USB-A output, marked as 5V and 1A, I have 3 questions: How long will this battery last while ...
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26 views

Faulty AC converter board [closed]

I have bought Dynacord DRP-15, but it seems like there is faulty AC converter board. When I turn it on, only LCD backlight starts to flash/blink fast. It somehow worked one time and when I tried it ...
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42 views

ACS712 current measurement not working

I have ACS712ELCTR-20A-T and I have connected it with the 5 Volt/10A converter. Vout in the schematic diagram above, is connected to ...
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1answer
55 views

PWM that can handle rapid on and off cycles?

I am working on a prototype project with a large electromagnetic solenoid. I want to be able to vary the strength of the solenoid via a PWM (preferred), or constant current. The issue I’m having is ...
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34 views

Max power transfer of source with variable internal resistance

I have been reading how to obtain maximum external power from a source using the maximum power transfer theorem. However, it is for a source with a finite internal resistance. Can you have power ...
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34 views

WS2813 weird noise and blink led behavior after power supply power off

I am connecting my 1m 60 led WS2813 led strip + esp32 to a 5v 30A power supply (which i bought in past for other project). The led strip is working fine but when I power off the power supply, the ...
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47 views

Smoothing rectified voltage

I am developing a circuit to convert 230VAC to 12VDC. I ran into the problem that my smoothing capacitor for the full wave rectifier is pretty huge. The load is estimated to be around 500mA and ...
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37 views

Windshield motor with ATX power supply keeps shutting down

I need to connect my windshield motor (12V) to my ATX power supply from old computer. I've tested the motor on my bench power supply and i draws around 1,5A @ 12V, so it should be well in range of the ...
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Power Electronics Book Suggest [closed]

Can you suggest me book about power electronics? It should be extensive and classic in the topic
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60 views

Making a neat, cost effective, efficient job of supplying 24VDC and 5VC

I'm making a device for industrial control that will internally use 5VDC (for the controller/RPi) and 24VDC (for everything else, sensors, interfacing with the industrial kit etc). The housing will be ...
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29 views

How to identify and check if transformer is working fine?

I have 3 in 1 SMD rework station and in that Machine veriable DC power supply is not working and I am unable to check if transformer is working correctly or not and if I have to replace how to find ...
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30 views

Is PMEG4005CT applicable here?

I am attempting to diode-or two power supplies (5V and 12-16V) and PMEG4005CT looks correct. Can I connect 12V to A1 and 5V to A2, have them isolated from the other's voltages and power the system ...
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1answer
42 views

Voltage drop across power supply rail

I have multiple PCBs which are communicating via CAN and are supplied by two power sources (5V and 24V). After the first field test we noticed a considerable voltage drop at the power supply between ...
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1answer
39 views

Safely connecting a preamp powered by a benchtop DC power supply to a power amp

I pulled the preamp out of a broken guitar combo amp. The preamp has positive, negative, and ground leads for powering it at +/-25V. I would like to power the preamp with a dual channel benchtop power ...
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5answers
110 views

What is the purpose of the ferrite bead on DC Adaptors?

According to WikiPedia: Ferrite bead suppress high frequency noise. In the case of wall power adaptors, are they trying to protect the device being powered or are they protecting the PSU from high ...
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4answers
91 views

Powering LEDs, dim LED in parallel

I want to build an light fixture for my aquarium and decided to use LEDs, almost everywhere it's suggested to wire the LEDs in series. but that will need a high voltage for many high power LEDs. also ...
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3answers
80 views

Is this lab power supply linear or switch mode type?

I'm using a lab power supply which has a manual here. It has the following block diagram: From the manual or the block diagram can we infer whether the supply is made up of switch mode or linear type ...
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1answer
67 views

Why do some SMPS power supplies require an input voltage select switch?

I have 2 SMPS power supplies near me. One is an ATX power supply, the other is for a 3d printer. They both are rated for 110-240v in, but the ATX supply can handle the full range automatically, while ...
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failing and noisy power supplies with PWM-controlled LED amplifier [closed]

I have 33 pieces of 5W LED bulbs that I am controlling with this PWM dimmer: https://www.anrodiszlec.hu/images/img_maxi/milight-led-szalag-vezerlo-dimmer-fut036-02.jpg I have measured from the ...
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1answer
60 views

Changing a power supply from dc output to ac output

I've read an article on changing a 12 v ac-dc power supply to 9v ac-ac by just tapping the transformer output directly, bypassing diodes and capacitor. This only applies to older type ac power ...
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30 views

Power Adaptor modification [closed]

I want to power an LED light which needs 15v DC to power 24 rows of 25 LEDS. I have a universal notebook adaptor rated 19v and 4.72A Max. 1. Can I use as is? or if not, how can I modify with restores ...
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46 views

Get constant DC Voltage from unstabe DC Voltage

Recently, I started a project which uses an old bike and a washing machine motor as a generator. I could already convert the AC output voltage to DC voltage, but it changes as you pedal faster or ...
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76 views

Do I need a buck converter?

I am planning to build a circuit with a bluetooth audio receiver (MH-M18) and an Arduino Nano, connected to a DIN connector. I have a wire with 12V supply readily available to connect to the circuit....
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30 views

Need help configuring battery pack for quadruped project [closed]

I've done some digging and can't seem to find a solution this. I am working on a quadruped, and I am currently designing the power system, and can't seem to settle on a way to hook up the battery ...
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1answer
72 views

Protecting a wire linked to a power supply

I have a power supply of this kind: https://www.makerlab-electronics.com/my_uploads/2017/06/36V-Switching-Power-Supply-01.jpg and wires linked to it like on https://i.ytimg.com/vi/DrZ8oupvzSE/...
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72 views

How to rule out that you have a faulty power supply?

Just for context: I'm trying to code an ESP8266-ESP01 through an arduino, but I'm failing and my primary suspect, as per other forum issues I read, is that the power supply is the fault. I've tried ...
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2answers
55 views

12VDC,3.8A On-Board Power Supply

I am trying to power 3 led strips (in parallel) and use pwm to make the leds change colors. https://www.adafruit.com/product/4245?gclid=CjwKCAiAg9rxBRADEiwAxKDTuu_xi9ko-vFyyAg11iDd7-...
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Just not sure - USB/Charging Pad [duplicate]

I have a "wireless" charging pad that is 5v 2a and I can't find a plug that matches the amperage. I have a 5v1a, 6v 800ma, 5v 250ma, and a 5v 500ma, so what can I use to make sure that it's not ...
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52 views

Combining 5V power supplies in parallel to obtain more current

I need to power 20 5V RGB LED strips, each consuming 1A at full white. I'm working with off the shelf 10A supplies, so technically I can power them all by combining two 10A supplies. I read that by ...
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2answers
70 views

Ground on power supplies

Why the power supply plugs of some modern electronic equipment have ground and some other ones -- with the same power, same manufacturer, same purpose -- don't? For example: I bought 90 Toshiba ...
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1answer
38 views

Understanding Power/Current/Voltage drawn by LED Strips

I am trying to create a LED lamp which will be powered up by a battery. Lets assume I want it to run the lamp for 1hr. My LED Strips operate at 12V with 19.2W/M. I am using around 1.7 Meters(198 LEDs) ...
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2answers
63 views

DC/DC converter with 12 outputs, low noise?

I need to 5V to 5V. It might seem surprising but let me expain. I need to convert a voltage of 5V with 60mV ripple (coming from a PSU doing 120V AC to 5V DC) to say 5V with low ripple. I'm however ...

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