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Questions tagged [power-supply]

An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.

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Power supply delivering more voltage than indicated even when loaded [closed]

Yesterday, I built a very simple circuit to examine the output of an old power supply (probably used for a camera or a very old fashioned mobile phone). It read 6 V / 2100 mA, so I wired it to a 4.7 ...
Oidipous_REXX's user avatar
-1 votes
1 answer
25 views

Power Integrations Spice Model [closed]

Does anyone have something close to a PI switcher spice model for flypack converter? I'm not sure if this is the place to ask or if there's a better site.
jkont's user avatar
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2 votes
1 answer
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Matching power supply to a four pin connector

There is a Power supply called HRPG-150-48. I need to deliver its voltage into a special 4 pin kind of connector. For me a connector needs only two pins GND and voltage. Given the data sheet of the ...
scot123's user avatar
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Relationship between inrush current, blowing the fuse and switching power supplies with PFC

I'm having the problem that my (switching) power supply of my new "mobile workstation" (laptop) is blowing the 230V/16A (about 40 years old) fuse (circuit breaker) most of the time when ...
U. Windl's user avatar
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3 votes
2 answers
2k views

Does a power supply wear out?

I have a recording desk which uses a 12 VDC, 4 A power supply. I always turn off the desk after use, but have not turned off the supply (220 Vac) to said power supply for maybe 7 or 8 years. The whole ...
Tim's user avatar
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1 vote
1 answer
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Usage of two PSU in parallel for WiFi router using Schottky diodes

I have Wi-Fi router which is powered by AC adapter with nominal output 9 V, 0.6 A. Due to power outages I have bought USB DC-DC adapter 5 V ⇾ 9 V and power it from power bank/power station. Router ...
1n5817's user avatar
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0 answers
35 views

ESP-8266 doesn't boot on particular power supply

I have an ESP-01 board (small board with ESP-8266) that usually works fine, but with one particular power supply, the LED just flashes rapidly and the module doesn't start. I know that these modules ...
Lukor's user avatar
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2 votes
1 answer
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Do you know this circuit? [duplicate]

I was checking the flipper Zero Wi-Fi Developer Board schematics and in the power section I bumped with this circuit, but I've never saw it before. Someone knows the name of the circuit or its purpose....
A. V.'s user avatar
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1 answer
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Maximum power transfer with constant source power

I am running tests on a stepper motor used as a generator. The stepper motor is directly coupled to a motor, which I can control with an ECS. In the ESC's software, I can choose to drive the motor ...
leheim's user avatar
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1 vote
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Bipolar 15 V DC from 9 V DC

I’m looking to get a regulated ±15 V DC @100mA minimum from a 9 V DC source. It’s for an audio circuit, so it needs to have a switching frequency well above audio range, and it needs to have a small ...
Connor Moore's user avatar
-1 votes
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30MHz signal that could drive a 100W load

I'm seeking an AC source or signal generator for a RF application with the following specifications: Output bandwidth: 0-30MHz Power output: 100W (necessary for sustaining a plasma) The issue I'm ...
ludicrous's user avatar
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Draw the following circuit [closed]

Draw the following circuit according to the condition below : switch one 1must switch lamp 1only and switch 2should only switch Lamp 2,,,,, when either switch or lamp is on , the other switch or ...
Kache Gobelo's user avatar
1 vote
1 answer
41 views

Distribute power from one battery to multiple devices

I have a battery, Li-po 3300mAh 22.2V 60C. Then, I have a system (main system, so to speak) which consist of STM32MP1 MPU (operating voltage [1.71, 3.6], typ. 3.3), STA8135GA GNSS IC (operating ...
keenan's user avatar
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0 answers
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Help identifying the component labeled IC1 [closed]

I have a problem with one power supply. It is a power supply for a pool cleaning robot, model 9995677, output 30VDC 220W, PCB number HGP-D6803.DB.PCB. The power supply was causing the fuse to blow ...
Lazr's user avatar
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Can a positive and negative voltage regulator be connected in parallel on a diode bridge and capacitor?

Can a positive and negative voltage regulator be connected in parallel on a diode bridge and capacitor? If so, how would this be done? Example: L7924 & L7812. I have a 12A transformer with two ...
mike's user avatar
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3 votes
1 answer
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What are these resistors used in this flyback converter?

I'm new to designing flyback converters. I noticed resistors connecting the primary and auxillary coils. Can somebody explain the usage of these resistors for me. The IC in this schematic is a CR1510. ...
Minh Trịnh's user avatar
1 vote
2 answers
116 views

How to isolate RS485 (A and B) from existing transceiver? Check attached circuit diagram, is it correct?

I have a controller with an RS485 transceiver, specifically the IS8489EIBZ-T, which is not isolated. I want to connect a BMS system to the output of this transceiver. After some research, I found a ...
mechaTronics Tech's user avatar
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1 answer
46 views

Please help me identify this IC - top marking "APKZ LS23"?

Please help me identify this IC - top marking "APKZ LS23"?
HNLinh's user avatar
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0 answers
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Getting 12 V from original 20 V of PSU in Vintage Arcade Cabinet

I have an old Italian Arcade Cabinet which is a clone of Atari Scramble. The game name is Explorer and was made by sidam. I am in the process of adapting this pre jamma cab to jamma so to use a ...
Chris Nuvoli's user avatar
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1 answer
70 views

Power supply gives at most 20 millivolts

I have a power supply KIKUSUI MODEL PAB 250-0.25A (photo below). The voltage source used to work correctly, but my roommates have used it for a while and now ...
ludicrous's user avatar
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1 vote
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Identification of 3 pin connector for the power supply of the TI silent Model 703/707 Data Terminal [closed]

I want to restore a TI Silent 700 model 703/707 that lacks the power supply. The power supply provides 20 VAC 35 VA with 3 pins ...
Jonas Stein's user avatar
1 vote
1 answer
52 views

error in stlink utility

I am having difficulty connecting the ST-LINK/V2 to my microcontroller. An error appears in the ST-LINK utility. I have already verified all the connections, including the decoupling capacitor, all ...
Nidhi Sayanja's user avatar
-2 votes
1 answer
67 views

Is it possible to build consumer-ready, non-PC modular power supplies for generic external devices? [closed]

I'm not asking for specific products or places to purchase them, I'm asking if such products exist and, if not, why, considering we have modular power supplies for the PC market. I've done some ...
Giuseppe Bertone's user avatar
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0 answers
23 views

How to use a LTC4120-4.2 charger with a 12.6 µH wireless charging coil? [closed]

I am working on a project where I need to charge an LIR1220 lithium-ion battery. This battery has a nominal voltage of 3.7 V and a fully charged voltage of 4.2 V. I am considering using the LTC4120-4....
Sean O'Sullivan's user avatar
1 vote
1 answer
66 views

Adding Resistor to Match Power Draw for Fan Replacement

I'm replacing a 12V 0.23A fan with a 12V 0.06A fan and want to keep the power draw the same. I believe there is load-sensing at the power supply side, which detects lower draw and shuts down due ...
jackar's user avatar
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0 votes
0 answers
65 views

Why does the STM32F030 hang when the solenoid Lock is activated?

The circuit consists of a STM32F030 and several 5 V relays, which are connected to the coil to open the door. The input voltage is from 18 V which is fed from a 220 to 18 V transformer (not switching ...
sn01's user avatar
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0 answers
19 views

Buck Average Modelling

I completed average modelling with Voreperian PWM switch model as described in Christophe Basso's book "Transfer Function of Switching Converters" and I compared the average model with ...
Power Path's user avatar
1 vote
3 answers
112 views

Programmable pulsed current power supply

I am wanting to build a lab-scale or benchtop power supply circuit which can produce theoretically square (practically trapezoidal-ish) pulses of frequency and duty cycle that can be set via Arduino/...
Kiwi's user avatar
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Soft Latching Power Switch with extra input

I'm working on a project that will be battery and/or USB powered. I would like to implement a soft power switch with the following functionality: Pressing the power button for ~1s turns on the device ...
Chris's user avatar
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2 answers
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Connecting Two 24VDC Power Supplies

I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
Dylan Mc Loughlin's user avatar
-1 votes
2 answers
132 views

Power supply for microcontroller

Can a microcontroller rated for 5-7V be powered by bipolar supply of +/-(2.5-3.5)V Considering fact voltage values are only relative scale and only absolute difference matters? A specific part number ...
dhuwarkesh's user avatar
-1 votes
1 answer
49 views

Can you help me understand W=I*V - house load

So I'm trying to work out my daily Ah usage for an off-grid set up (and to see what my power bill at this new place might be like). Context: I've gone through and created a sheet with the appliances I ...
theYnot's user avatar
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0 votes
1 answer
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PCB inverter design

While prototyping a inverter or a power converter on bread boards we use separate power supply for microcontrollers and separate supply for gate triggering. But how to design a PCB for an inverter or ...
Ranesh Subramani's user avatar
1 vote
2 answers
88 views

How to protect a motherboard from an old power supply? [closed]

I have an old Taiwanese Senstron ST-41 (TAO YIN-TCY6 94V) power supply from 1987 used in an Apple 2 clone with DC outputs: 5V 5A 12V 2.5A -5V 0.5A -12V 0.5A Is it possible to add extra protection (...
Anton Andreev's user avatar
5 votes
7 answers
1k views

Does it matter if a fuse is on a positive or negative voltage?

I have a power supply with -5V DC output. Can I use a fuse 5V 0.5A for this -5V rail as if it was 5V 0.5A? The rail I want to put a fuse on goes into the motherboard. The motherboard does not have any ...
Anton Andreev's user avatar
0 votes
1 answer
45 views

Is a smoothing capacitor only useful when the trace has impedance

Under conditions where maybe a capacitor is used maybe when perhaps there's a high impedance power supply and the source would cause current surges, maybe a subwoofer to a car battery that can't deal ...
George kirby's user avatar
2 votes
1 answer
40 views

does rf remote transmitter power affect solenoid strength

Remote-control nestbox (bird) trap design calls for one 9V battery (pack with switch) boosted to 12V with MT3608 module to power 12V 433Mhz RF remote receiver, which is connected to a ZEY1-0530 ...
moabird's user avatar
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1 vote
0 answers
24 views

Low Quiescent Current over USB Type-C [closed]

I'm working on a battery powered project which I'm currently planning on powering over USB Type-C for flexibility. The 5V/3A spec would satisfy my needs for the high end of power draw, however, I want ...
TianCilliers's user avatar
1 vote
1 answer
62 views

Help me to identify SMD diodes marked '1DN'

Help me to identify SMD diodes marked 1DN.
Ksm's user avatar
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0 votes
1 answer
53 views

Help me to identify an SMD component marked 'NM' in an SOT-89 package

Identify transistor marked NM:
Ksm's user avatar
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2 votes
0 answers
45 views

Input/ Output Impedance of Converter/Input Filter (SIMPLIS)

I'm trying to replicate an impedance plot showing the output impedance of the upstream filter and the input impedance of the downstream converter, but within the sample plot. Can I get help with: ...
RogerDodger's user avatar
0 votes
2 answers
74 views

Does it improve safety to make a capacitative dropper symmetric?

Here's the most basic capacitative dropper circuit I could find with ten seconds on Google. Allegedly the voltage across the load will be about 5V. (I say "allegedly" because I couldn't ...
zwol's user avatar
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2 votes
2 answers
198 views

Powering on a laser diode that exceeds PSU max current

I have a laser diode that I want to test (just seeing if it turns on). However, the threshold current is past the 10A that my bench power supply can supply, hence I can't generate any light. How can I ...
AnttiP's user avatar
  • 209
4 votes
2 answers
487 views

How is it possible to supply an LM833D with +12V and -8V supply?

I was studying a Philips CDR-765 circuit when I came across an output driver circuit consisting of an LM833 opamp supplied with -8VDC on the 4th pin and +12VDC on the 8th pin. This is the first time I ...
kunal pandit's user avatar
0 votes
0 answers
30 views

Help needed for verifying 3.3 V wireless charging schematic with LIR927 battery

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. I am working on a wireless charging ...
Sean O'Sullivan's user avatar
2 votes
3 answers
214 views

What's the role of the transistor on power input in this schematic?

This is the relevant part of the schematic for ESP32-2432S028 board I have. It's normally powered by 5V over Micro-USB (the right-hand schematic). I want to power it with 5 V through the HC-1.25-4PWT ...
SF.'s user avatar
  • 1,212
0 votes
2 answers
69 views

ADC pin protection when using external power supply

I was playing with ADC on ESP32-C6 (devkit board) trying to read values from photoresistor (VT90N2) in voltage divider with another (10K) resistor. simulate this circuit – Schematic created ...
valeroso's user avatar
0 votes
3 answers
92 views

Help Needed with Compact Circuit Design for Pulse-Triggered Switch-Off Sequence

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. The project requires a compact circuit ...
Sean O'Sullivan's user avatar
0 votes
1 answer
42 views

Power MOSFET Simetrix simulation using in LLC

I'm trying to model switching losses of an Infineon Power MOSFET (IAUS300N10S5N014) in SIMetrix/SIMPLIS Elements by using in the LLC circuit. But I have some questions. In the SIMetrix, how should I ...
EEC's user avatar
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0 votes
2 answers
83 views

Power Supply Double Output +12 V -12 V

I’m checking this power supply. But it works to supply the diagram I attach? The situation is because I see in the diagram is required -12 V and +12 V, then I don’t know exactly: if what I need is ...
coerrace's user avatar
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