All Questions
Tagged with schematics power-supply
63 questions
0
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24
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How to power and dim 3S10P LEDs from a USB-C using MT3608 and AL8860 for flicker-free operation?
I'm a electrical newbie. I’m working on a project where I need to power and dim a set of LEDs from a USB-C power bank (5 V, 3 A max). My LED configuration is 3 LEDs in series per string (3S) and 10 ...
0
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0
answers
59
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Is there a way to diagnose the this PSU fault with a multimeter only (schematic provided)?
Long story short, my subwoofer has stopped working and I've narrowed the problem down to a fault in the low-power standby circuitry - it should be giving me +7V and -7V, but currently the +7V is just ...
- 190
1
vote
1
answer
85
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How do I show the power source switches from binding post to batteries on a schematic?
I'm making a circuit diagram for a friend, and she wants me to draw that the Gopros on her project switch from a DC power supply using binding posts (positive and negative terminals) to a 12V battery ...
- 121
0
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1
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104
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How to prevent loop in auto-switching charger using MH-CD42 and LTC4412?
I'm making UPS-like power supply using MH-CD42 lithium-ion Battery with 5V boost charging module and LTC4412 power or-ing IC chip.
I made my schematic based on the picture on google like the pictures ...
2
votes
1
answer
162
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micro usb is not giving 5v but instead vbus is giving 0.45v
I just got my first 4 layer newly assembled board from PCBway.
When USB cable is connected, the board is not powering on.
When I checked the vbus it's showing 0.45v. After this I checked the MOSFET q1 ...
4
votes
1
answer
354
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What is this schematic symbol (a dark line and an empty circle) in a small power supply?
This is a power supply to a small audio amplifier in John Lenk's book Handbook of Simplified Solid-State Circuit Design (p. 82). It appears highlighted below in parallel with the transformer and fuse,...
- 1,271
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1
answer
96
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How to dimension a solar battery charger?
I am currently designing my first PCB and I am having some difficulties. It will be a solar power management board with a USB input, li-ion battery, PV module and a not yet defined 7.2 V output ...
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59
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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 ...
2
votes
2
answers
232
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Choosing resistor for the emitter pin of the TIP41C!
There are many ways to choose current-dividing emitter resistor values for transistors in parallel on the internet. However, what I found is that only if the voltage from the collector pin are fixed ...
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0
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2
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139
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Is there a colour code for electron flow notation? [closed]
I'm building a power supply for electro-chemistry experiments. It would make more sense to have the output correctly denote which terminal is 'electro-negative' and which is 'electro-positive' instead ...
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1
answer
236
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Zero Crossing Detector
Thanks for your help in advance!
I'm doing a zero cross detector for a microcontroller, PIC16F15223. I will be reading this as a digital input, and not as analog. The circuit is posted below. I know ...
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-1
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1
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166
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How do you turn on a battery and a timer using a single mechanical switch action?
I am adding a 12V battery to a circuit where I previously used a transformer power supply. The circuit works well but is unused for extended periods of time and there is an issue with the LED display ...
0
votes
2
answers
322
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Power supply names
I'm studying and trying to understand Google developer board schematics, but there are a lot of redundant power supplies. This board is a carrier board when SOM is mounted. For example this:
This is ...
- 410
14
votes
1
answer
2k
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Geometric symbols alongside input filter capacitors on 1960's amplifier schematic
Capacitors C1, C2 and C3 are accompanied on this schematic by a semicircle, square and triangle symbol respectively. I'd expect the meaning of unusual symbols to be explained on the same drawing; they ...
- 629
2
votes
1
answer
527
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Advantage of the very common electronics-lab.com linear power supply circuit
I'm in the process of designing my own lab power supply. During my research I came across a design from electronics-lab.com that seems to be very popular for DIY adjustable power supplies (here is a ...
- 161
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3
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1k
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The use of capacitors in voltage regulator schematic using 7805 and 7812?
I'm a newbie in electronics so I lack a lot of basic electronic knowledge.
I found this schematic about making regulated power supply 5 V and 12 V DC from AC. The diagram is below:
This is what I ...
- 53
0
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1
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317
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What is the purpose of this circuit from an ATX power supply?
I am trying to understand the working of this circuit but I didn't get the exact intuition.
The circuit is extracted from an ATX power supply. The objective is to have 5V and 3V3 (and of course others ...
0
votes
1
answer
174
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Buck / LDO combination
I have a design question.
My design has grown in complexity because of new sensors (requires 5v).
In the old design a 3v3 output from my buck was sufficient, however now I have to create both a 5v and ...
- 1,317
1
vote
1
answer
443
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Using VBUS instead of the USB port to power a MCU
I'm using an EK-TMC123GXL, for now powering it from the PC. I have found some problems with some pins (ADC, PWM) that doesn't arise if I power it up applying 3.3V to its VBUS pin instead of connecting ...
- 1,395
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356
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Mini-UPS schematic - load-sharing of battery pack and power source
I am a beginner working on a mini-UPS project for a low-power server (computer).
I've made the following schematic where I'm trying to achieve the following:
Charge 3S 18650 battery pack BMS with 12....
- 1
0
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0
answers
109
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RF Collection PCB Schematic
I usually work with breadboards, but I wanted to use the P2110B from Powercast, and since I couldn't find any breakout boards for it and desperately needed some experience with schematics and PCBs, I ...
10
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2
answers
17k
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What are VDDA and VSSA?
What do VDDA and VSSA mean? Are they for a separate analog power supply? What is an analog power supply in this context? How does it differ to a digital power supply? Which one is better to use and in ...
- 129
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1
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831
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Power tree understanding
I am projecting a brushless motor driver that contains a LoRa SX1276 radio and a ESP32-D0WDQ6 chip. The power line then gets really noisy when everything is working.
For the RF blocks (SX1276 and ...
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0
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1
answer
135
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Connecting an external switch to my circuit
I'm pretty new to electronics and kicad.
I would like to understand how to add a physical switch to my circuit using molex connection.
I'm adding my initial schema.
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7
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10
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10k
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What's the right way to draw these capacitors in a schematic?
I placed my capacitors in this way (A) but another person tells me that a better way is like this (B) which one is the right one.
- 178
2
votes
2
answers
205
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Why is this boost converter application circuit done this way?
The schematic below comes from boost converter AP6714 datasheet - so I assume it's good, but it is very atypical.
Most (all that I used) of the impulse power converters have VOUT connected to the ...
- 1,627
0
votes
1
answer
371
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Designing a voltage regulated power supply
I am trying to build up my own regulated power supply, as a way of getting confident with simple electronics and actual hand labour. I am an electrical engineering student, so this is why I am ...
0
votes
1
answer
131
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Why is this power supply split?
I am looking at a schematic for the Pixhawk 2 board. It has a complex power distribution system (see photo below)
Much of the complexity exists for one of two reasons
redundancy
shutting off ...
- 947
0
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1
answer
1k
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How to diagram power-side and ground-side switches?
I'm an early-stage self-teaching hobbyist.
Just as a practice exercise I'm diagramming simple circuits (without looking at the instructions) of DIY kits that I've bought on banggood.com (awesome ...
- 417
10
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3
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28k
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What does n/o and n/c mean on a schematic diagram?
Okay so I have two questions. I am looking at a schematic diagram of a remote control for a toy car and I can't seem to figure out what the "n/o" and "n/c" components stand for that are attached to ...
- 111
1
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2
answers
1k
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How to Convert 28V to 12V?
I have to use a 28V DC power supply for a certain design I am doing. But I only need 12V DC to power up this device. How would I design this in a schematic? What would I need? I have been searching up ...
- 11
0
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3
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237
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What is this component on circuit schematics? [duplicate]
It's a resistor like coloured 2 pin component from a power supply board of a home theatre, with a glass-transparent aspect. I'm a hobbyist and not into complex circuit till now... looking for an ...
- 1
1
vote
1
answer
288
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Help understanding this schematic : Why is the diode there (AT89C2051 Programmer)?
I am having trouble understanding the following portion of schematic from AT89C2051 programmer circuit. Please help me comprehend what is going on here.
Here is what I understand:
A1 directly ...
- 215
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1
answer
3k
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Dual power supply by chaining two lm317 voltage regulators in series: will it work?
I am short an adjustable negative voltage regulator, so I am trying to link two lm317 regulated power supplies to form a dual power supply. Is this possible? They are both connected to a center tap ...
- 11
1
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3
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4k
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What does this schematic notation mean?
I’m rewiring a Desktop CNC controller and came across the attached info on one of the internal modules (variable frequency drive).
The two 220v mains power inputs are labelled R / S / E where I was ...
- 125
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0
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132
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Schematic review of power supply
Would you be so kind to point out any errors in this schematic or anything else to improve (layout and clarity also greatly appreciated).
This is supposed to be the power/regulating/batterycutoff ...
- 27
5
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2
answers
3k
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Lab power supply schematic review
I've just finished designing my own laboratory power supply unit. At first I wanted it to be 0-3A current limited, ~1-30V, but I've changed my mind about it - I think I might need more acuracy in the ...
- 225
4
votes
2
answers
1k
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How to read STM32F407xx Microcontroller Power Schematic?
I am working with an STM32F407xx microprocessor to analyze incoming signals generated by some hydrophones in a sonar system. At this point in time I am just reading through the datasheet and trying to ...
- 181
0
votes
1
answer
83
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Volt regulator for in the car to run a rasperry pi
So I have an raspberry pi (with alot of other stuff on it like a touchscreen and GPs module), but I use it in the car. It consumes alot of power and the default power supply which deliveres 2.4 amps ...
- 109
0
votes
1
answer
254
views
Which symbol to use in my schematic for a supply signal which is also an output?
The following diagram shows a voltage regulator that gets two inputs (+-24V) and generates two outputs (+-15V). For this reason, I am representing the 15V signals as outputs, but I don't know if this ...
0
votes
1
answer
2k
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Chinese power supply schematics/components [closed]
I have a chinese power supply which i brought from a garage sale which has some problems. I opened the case and I concluded that some resistors and capacitors are burned. I would like to repair this ...
user126120
0
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1
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381
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Power supply unit from 230VAC to 12V, 5V, 3.3V DC [closed]
Is this power supply correct?
The capacistors are for decoupling. This power supply is for:
2x 2W fans
4x sensors (simple temperature, humidity)
uC PIC24
*(the component 'Regulator' is LM7805)
*(...
-1
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1
answer
94
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Power source after load [closed]
Recently I bought a automation module for my home, and frankly it is not clear how it works.
It is a illumination module, where the installation needs just substitute the switch by the module. See the ...
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-2
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1
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748
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How to calculate the energy consumption of a liner sensor array?
I'm trying to determine the energy consumption of a device in kilowatts, but I'm having trouble because the datasheet provided only gives me estimated voltage and not amps.
DATASHEET: http://pdf....
1
vote
1
answer
258
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choosing a voltage regulator chip
I'm designing a schematic for a system that will utilize plug-in daughter boards. I'd like to provide the daughter boards with high quality 12V, 5V, 3.3V, and 1.2V, with up to 5A, available via pins ...
-2
votes
1
answer
671
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Coil Gun Schematic [closed]
I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically:
Battery-->Switch-->Diode-->Transformer-->Coil
For ...
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2
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4
answers
3k
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Difference Between - (Minus Sign) and Chassis Ground in Schematics
I was working on building some projects from the book Electronic Projects for Musicians and I noticed that in most of the schematics there are two symbols for what seems to be ground. One is a - (...
- 356
-2
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1
answer
4k
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Schematic of switching power supply 230V to 5 / 3.3 VDC [closed]
I would like to ask you if you have the schematic of the power supply mentioned below. There are various variations but the input is always AC 85-265V 50/60 HZ while the output is, depending on the ...
- 123
1
vote
1
answer
247
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Are pins of WOG bridge package numbered?
The WOG package used for a diode bridge looks like this:
As I'm preparing a PCB layout footprint for this device, I need to assign pin numbers. Those pin numbers map to the schematic and ensure the ...
- 7,152
1
vote
1
answer
177
views
Does 3x22μF mean three capacitors of 22μF in parallel or series?
In the following schematic (TPS63061) several capacitors are denoted as multiples. As a newbie I am unfamiliar with this notation: does 3x22μF mean three capacitors of 22μF in parallel or series?
...
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