More than one of a thing, performing the same task simultaneously

learn more… | top users | synonyms

1
vote
1answer
16 views

Photomultipliers in Parallel

I have a photo-multiplier going into a preamp then two stage shaping amp (PC250 and PC275 board from Amptek). The photo-multiplier is attached to a plastic scintillator and then a beta emitting ...
-3
votes
1answer
64 views

I want to use many parallel LEDs. Can this IC (BP3309) help me to control them?

I want to use many parallel LEDs. Can the BP3309 IC (datasheet in Chinese) help me to control the LEDs? I want consistent brightness.
2
votes
2answers
98 views

Help to join 3 resistors in parallel into 1 (power equiation?)

I want to join 3 resistors connected in parallel into one. Like this If for the total resistance I use Rt = R/3 But what about the power of them?
0
votes
2answers
63 views

Circuit analysis (Intro to Parallel Circuits & Series)

We are just in the beginning phases of learning how to simplify circuits by finding equivalent resistance. I've gotten every problem right except for this one. The answer says its 2000 ohms, but I ...
0
votes
0answers
28 views

Energy harvesting from multi source in same time

I see there are a lot of energy harvesting IC's capable to use with a solar panel or Rf to DC systems. Lets say both solar to DC panel and Rf to DC circuits outputs 1.2 V potential, is it good to ...
2
votes
2answers
200 views

Old Text Book Current Question [closed]

Can anyone help my 13 year-old with an assignment? I have little knowledge about electricity and I need to teach her about circuits. We have a question from her seventh grade science book that has us ...
-3
votes
0answers
125 views

charging two 18650's with solar panels and usb charger [closed]

I want to charge my phone using some batteries charged by solar panels. I was told that I could connect a 5v usb charger too, but i don't know how I should connect it. how should i connect it? (the ...
-1
votes
1answer
55 views

Why is wiring some LEDs in series better than wiring them all in parallel?

I noticed a lot of guides for making an LED array or matrix prefer to wire their LEDs in series first and then wire strips of leds in series in parallel. What is the benefit of this Vs wiring them all ...
0
votes
4answers
136 views

Capacitors in parallel without resistance

For the following circuit, at time 0, the switch switches from A to B, figure out the voltage wave form at B. The question I am concerned with is whether the voltage across the capacitors will ...
1
vote
1answer
64 views

Can i double max current drawn, putting batteries in parallel?

Im dimensioning a quadcopter,and from my math, everything will draw a maximum load of 58-63 A. I need to choose Lipo batteries that can handle that current draw. From what I know: Max current: ...
1
vote
2answers
30 views

Parallel Piezo Pickup Problem

I've an electronic drum machine - which involves electronic drum pads with piezoelectric transducers in them (which pick up you hitting the pads with your drum sticks) which feed into a magic drum ...
0
votes
2answers
24 views

Help connecting solar cells to be 12 V

I just purchased a lot of 40 solar cells each with 1.8 W, 0.5 V, and 3.6 A. This gives a total of 72 W. Ideally, I would like to connect the cells in a manner to yield 12 V. I know I can connect two ...
3
votes
1answer
37 views

Capacitors in parallel

I am using a old disposable camera to charge and discharge my Cap. I got 4 Caps and Connected them in Parallel (Hots to hots as is Grounds to Grounds). Can I use this just like normal? Can I just hook ...
2
votes
1answer
42 views

Parallel bus trace width and spacing

I have been working on designing a PCB for a Z80 computer that I plan to sell a few times for interested people. The Z80 will work at a maximum of 8 MHz and has parallel lines going to a system ...
1
vote
1answer
44 views

Connecting different batteries in parallel - how to calculate the voltage?

I have an exercise: I have two ideal battieries connected parallel: simulate this circuit – Schematic created using CircuitLab I calculated a resistance of the whole circut: 0.666 ohm. ...
1
vote
1answer
138 views

Review my PCB? Mosfet to parallel leds

Can someone please review my PCB? Simply, I'm running 24 IR Leds at medium power, from a 5v arduino MCU pin, all pulsing together (38khz). Big fat traces, lots of space, SMD components. The LEDS ...
0
votes
1answer
80 views

How to drive paralleled mosfets with a microcontroller? [closed]

I want to make a DC switch with mosfets as follow: Now I want to know does this circuit work with reliability? And I want a circuit between avr microcontroller and this circuit to drive the mosfets ...
3
votes
2answers
205 views

Smartest way to charge 18650 batteries when they are used in series

I'm wondering how I could/should charge the 18650 batteries used in the following circuit. I want to charge them via USB in a power bank case like this. But I probably won't be able to use the ...
3
votes
1answer
55 views

Best way to multiplex button lines on existing circuit

I have a target device that has push buttons that when pressed send a constant 3.3v signal to the MCU button input GPIO's until released. Externally from a different device (perhaps a Raspberry Pi) I ...
0
votes
2answers
79 views

Supplying more current to a current limited DC motor

simulate this circuit – Schematic created using CircuitLab Added requested schematic. Current circuit is on the left. Proposed additional circuit is on the right. I've never seen two ...
0
votes
0answers
33 views

Charging Two 12V Batteries in Parallel with One Charger

I have two 12 Volt batteries in my van, Main and Aux. My battery separator is a uni-directional solenoid (Sure Power 1314-200), that will close when the Main receives a charging voltage of 13.5 V or ...
0
votes
1answer
138 views

Is it ok to connect batteries in parallel?

I've seen some questions about connecting batteries in parallel to increase capacity, and the answers all indicate that it's fine to do. But why? Isn't that creating a short if the batteries aren't at ...
0
votes
0answers
78 views

Parallel to CSI camera bridge

I want to use a parallel camera sensor/module with a SOM that only has a MIPI CSI-2 camera interface. What are the options I have? I found a dedicated IC by Toshiba (TC358746AXBG/TC358748XBG) which ...
0
votes
1answer
58 views

Converting 12V capacitors from parallel to series: do they need to be rated for 250V?

I have designed a DC-to-DC voltage multiplier. It works by first loading 21 capacitors in parallel with +12VDC and then switching them to series using my homemade 42 pole relay. The output would be ...
0
votes
1answer
73 views

Simple parallel SMD LED circuit(need help)

I'm going to make some LED circuits, but I'm not sure if it will work. The problem is that I want to use Red and Blue leds, but they have different drop voltage. Will this circuit work?
0
votes
0answers
52 views

Mosfets switching deep cycle batteries between series for 24V motor and parallel for 12 charging with solar panel

Edit: I'm getting a 24V solar charge controller as referenced in a comment below so the need for a solution to this specific problem is moot. It's okay with me if the mods want to shut this one down. ...
0
votes
1answer
50 views

How to calculate the total resistance fo a parallel circuit in series

I have a simple question on resistance calculation but I can't work it out. The diagram is from the site all about circuits. I can't figure out why the top parallel total resistance for example is ...
1
vote
2answers
110 views

12v battery banks and amp hours

So I'm new to the battery banks. One bank is (6) cells made of (2) 6v, 12 amp hour sealed lead batteries each. Wired parallel to make a 12v, 144 amp hour bank. Is that correct? Next I have a smaller ...
3
votes
4answers
899 views

Can I use multiple 18650 batteries in parallel with a standard MicroUSB 3.7V charger board?

There is this Bluetooth Audio Reciever/Amplifier board that I'm looking to get from ebay, and according to the diagram, there's a MicroUSB 3.7V lithium battery charger component in it. With my ...
0
votes
1answer
54 views

Total current drop when using leds in parallel [closed]

I'm making an led light for video shoot purpose. It's an array of 20, 5w led in parallel. The problem I'm encountering is, current drops when I'm connecting them in parallel. My power supply is ...
1
vote
0answers
40 views

Raspberry Pi parallel power

I have wired up 4 Raspberry Pis in parallel, each being activated by its own SPST toggle. The circuit is being powered by a 5V 5A switching power supply. Each time I power on a pi after the initial, ...
-6
votes
1answer
58 views

Please can somebody analyse this circuit

I am struggling to find the value of resistor x, I have tried a few ideas such as treating the 4 resistors as a 4 way parallel, also getting Rt of the 10 and 15 Ohm resistors, then working backwards ...
1
vote
2answers
119 views

LED resistance calculation for combined Series/Parallel Configurations

My son's fish-lava light LEDs burned out. Here is the simplified version of the circuit (some components removed for clarity): I've spent the last few days researching LED circuits. I realize that ...
2
votes
3answers
50 views

heat sink calculation for parallel bjt

I'm working on a project and I need to use 3 parallel bjt to give me 20 A current.Total power dissipation is 356 W.I know how to calculate a sink for one transistor,but in this case I'm not sure what ...
-1
votes
2answers
57 views

Are the components in series/parallel to the output voltage & current? [closed]

simulate this circuit – Schematic created using CircuitLab Is the load(R1) considered to be in series or parallel to the output voltage from the boost-converter? From point A-B for any ...
0
votes
3answers
62 views

12V,20W bulb connection doubt

I have 8 12V,20W bulbs and want to connect them in series. I cant seem to find a 12V,160W transformer for my 240V mains supply. Is there another way like connecting in series+parallel connection to ...
0
votes
1answer
62 views

Different and opposing voltage sources?

simulate this circuit – Schematic created using CircuitLab The diagram above, the voltage sources are equal and wired parallel, they would increase the current(2x) flow to the load(R), ...
4
votes
1answer
52 views

How do I derate paralleled diodes with negative temperature coeffecients?

In my application, my load current is 1.4 amps, and for reasons of cost, availability, and recovery time, I want to use this particular 1 amp diode. Like many diodes, this one has a negative ...
0
votes
3answers
79 views

Blinking 3 led's in parallel?

I have a PIC development board which has few on board led's. I am programming MCU so that it can blink 3 led's in a parallel manner. I have made the following code: ...
1
vote
1answer
68 views

Can I connect two rechargable LI batteries of different specs in parallel?

More specifically, can I combine a high-discharge battery with a high-capacity battery if I want periodic high discharges combined with the higher capacity? For example, if I wanted to pair a ...
1
vote
1answer
49 views

NOR Flash Interfacing

I am trying to understand the PDF From the following URL: Spansion Application Note Under the heading Flash Address Pin Labels, it describes that "In word mode there is no means to individually ...
1
vote
1answer
51 views

Is the circuit a Parallel RLC if there is a voltage source in between capacitor and inductor?

simulate this circuit – Schematic created using CircuitLab As the schematic shows, there is a voltage source in between capacitor and inductor. Is it a valid Parallel RLC circuit. For ...
5
votes
3answers
299 views

Multiple switches, same function. Can they be wired in parallel to a single I/O pin?

I'm working on a Raspberry Pi project that requires 30 separate momentary switches to be hooked up to trigger the same function within the software. It's for an art project. I don't need to ...
0
votes
2answers
184 views

Series and Parallel Circuit Problem

! I know how to find resistance, current, and voltage through series/ parallel circuits. The problem I'm having is figuring which part of this circuit to simplify first. What is the correct order of ...
0
votes
2answers
75 views

Kirchhoff's Laws on Series-Parallel Circuit

Consider the circuit The writing in red are my own additions (so let me know if it's wrong). From Kirchhoff's Laws, I obtained \$I=I_{2}+I_{1}\$ \$I_{1}=I_{3}+I_{4}\$ ...
3
votes
2answers
528 views

Two conductors in parallel

If we have one conductor through which current flows, and we place second conductor near it, the conductor with current flowing will induce electron flow in the second conductor. Can we detect the ...
0
votes
1answer
167 views

LEDs connected in series, parallel, and series-parallel combination [closed]

I have the following two circuits. And, there is a third circuit where all the LEDs are connected in series with one resistor. Could someone please tell me how each circuit works in terms of ...
1
vote
2answers
129 views

LEDs in Parallel; Which Transistor, and do I Need Resistors?

perhaps you can help out. So, I'm making a prop replica and light is a big part of it. To this end, I picked up three cheap LED torches, which have arrays of 9 LEDs in each. Cheaper than I could buy ...
2
votes
1answer
70 views

Low voltage cutoff circuit with USB reset

I am currently trying to design a circuit for a low voltage cutoff. Once the voltage dropped below a certain threshold it should stay low. When a USB-cable is attached it should reset and start ...
1
vote
2answers
98 views

Why does my current in parallel circuit not add up when I check using a multimeter?

I have a simple circuit 9v connected to 3K resistor coneected to a wire. On this wire, I have two LED's connected in parallel, both leading straight to ground. When I check insert my multimeter ...