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

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2
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3answers
147 views

Is there a GPIO IC that has a parallel interface?

Sorry if this is an obvious question, I come from a software background and don't know the names for a lot of components. I am designing some custom hardware based around a W65C02S processor (a modern ...
-1
votes
1answer
57 views

How to optimize wiring of Christmas lights in parallel and in series? [closed]

Suppose we want to wire some Christmas lights. Should we do this in parallel, series, or both parallel and series? The answer is both parallel and series since if every light was in parallel the cost ...
8
votes
3answers
766 views

Can I solder a wire between two leads on a PCB to make up for a trace that isn't wide enough?

I have a PCB that has 2 traces on one corner who's width only supports a ~10a load. I need support for a 20a load. Actually, it really only needs to support a 15amp load but I'm trying to build in ...
1
vote
1answer
77 views

12V LED strips in series with a 24V power supply?

I am purchasing 50x - 1Meter / 12V / 72 LED /Rigid SMD 5730 strips directly from china. I don't know the LED manufacturer, nor the resistor being used. (yes, this is a gamble) The strip is one that ...
1
vote
1answer
132 views

Resistor in series and capacitor in parallel to ground

Could somebody tell me why someone would need circuit like that in supply rails? I assume it is for making DC voltage smoother by parallel capacitor. However, my 24V power supply has 500mA output ...
1
vote
3answers
89 views

Paralleling power supplies for higher current

I am looking at using two Cincon (CFM80S240 and CFM60S240) power supplies in parallel to achieve a higher current output. Is this possible? If so, can I just hook them up in parallel, or is there some ...
0
votes
1answer
27 views

Resonant frequency in parallel

I'm currently learning about resonant frequency and harmonics under ac theory in tafe, and I've read a few things about resonant frequency in parallel, and it seems as if impedance at resonant ...
0
votes
1answer
114 views

What capacitors do when it is connected in Series and parallel to a AC input

I have seen in many circuits the capacitors are connected in series and parallel with the AC line. What the capacitor actually does when it is in series and parallel. I know capacitors passes AC ...
0
votes
2answers
48 views

Finding load resistance to achieve max power transfer

1) So, to find Thenevin equivalent resistance, R-Th, I disconnect R_L and disable the voltage source by shorting it out. ...
-2
votes
2answers
58 views

Understanding circuit : Output of a CD4017 with 1N4148 diode and RC circuit

I'm reading a circuit on a magazine (look at circuit below) and i don't understand , why the author put a 1N4148 diode and a RC circuit at the output of CD4017 , what is the operations of the RC ...
0
votes
2answers
71 views

Debouncing - Parallel RC circuit?

I was unable to understand two parts of a circuit in a magazine, where you can see a resistor R4 and a cap C8 to ground for—I guess—debouncing purposes, but can't see how it works. The ...
1
vote
0answers
83 views

Charging batteries in parallel when they are connected in series in the circuit

I've got two LIR2450 rechargeable 3.6v coin cells. These need to be connected in parallel to form a 7.2v current which is being regulated down to 5v to power an ATMEGA328P. I need to charge the two ...
0
votes
0answers
50 views

3x CAT4101 parallel with CREE LEDs

I've tested the LEDs with one CAT4101 and they work great, but now it's time to dial it up a notch. I've now got three CAT4101's wired up in parallel to give me 3A to drive two 10W CREE LEDs in ...
-5
votes
1answer
79 views

Series and Parallel Circuit

In the following schematic, if R1 = 42ohm, R3 = 33ohm, VT = 220V, and IR2 = 1A How do I find R2? simulate this circuit – Schematic created using CircuitLab
0
votes
1answer
76 views

connecting oscillators in parallel to increase current

I am trying to power an alternating current coil, and was wondering if I can connect the output from transistor oscillators in parallel to increase the current, like you can with batteries. I don't ...
0
votes
1answer
91 views

Real power and power factor for resonant RLC parallel circuit [closed]

I have no problem finding parts a, b and c, however I don't know how to get part d. You don't have to solve it for me(although it'd be greatly appreciated), but please give me somewhat of a hint or a ...
0
votes
2answers
106 views

Fast rectifier diodes in parallel at SMPS

I'm trying to build a 35 V @ 10 A SMPS. I don't have 15A diode to rectify the transformer output. Can I use two BYW29 in parallel? They are rated at 8A. I know that when diodes are in parallel, the ...
1
vote
1answer
108 views

Voltage on circuit input different than on power supply

I'm using a really good 5V-35A switching power supply to power some mini PCs (Cubieboards if that matters) as below. simulate this circuit – Schematic created using CircuitLab The weird ...
0
votes
1answer
55 views

How to put a battery and battery charger parallel in a circuit

I am making a speaker that runs at 3-5.5 RMS and I need a battery to supply power to it and so I got a house phone battery pack with a diode now I need a way to charge this so when it is charging that ...
1
vote
1answer
168 views

LED wiring questions with 9v battery as power source

My son is working on a project in which he is using 36 total LEDs consisting of 7 different LED's. There are 6 different solid colored LEDs varying from 1.88v to 3.2v and one color changing that is ...
4
votes
3answers
455 views

Is it good practice to parallel relay contacts for increased current capacity?

Say I have a DPDT relay, like T92S7D12-24. The contacts of this relay are rated for 30A, but there are two sets of contacts. Can I parallel the contacts to get an effective 60A relay? Further, could I ...
0
votes
1answer
112 views

Two L298N for two stepper motors

I have two stepper motors (ripped from old scanners) and two L298N ICs. I have to connect these motors to the STM32 MCU, and I'm going to use this scheme: I want to make one board for two motors ...
0
votes
4answers
191 views

Circuit capacitance question

Given the following circuit, what ways there are to calculate its total capacitance? Thing is this is not a simple case, and I can't really decide which part is parallel and which is a series, ...
1
vote
3answers
199 views

How do you set the reference voltage for a comparator?

I know this is certainly a beginner's question but am a first year student so hopefully I can be forgiven. I was looking through a electronics booklet provided by IKES website, and it's talking about ...
1
vote
2answers
131 views

How to get higher amperage out of a power supply?

I currently have a 24V - 5A power supply in a commercial product that may require upwards of 8A from the load. Ideally, I would just hook up another 24V - 5A power supply in parallel and not worry ...
0
votes
1answer
225 views

Charge at 24v and discharge at 12v for battery system

Is my thinking correct. Below is a simple diagram of the concept I want to check. Is this: 1: Possible 2: Feasible? I.E are there any concerns or foreseen issues with this design? Edit:
1
vote
4answers
141 views

How can I control a LED with two separate control circuits?

I have a LED controlled by a microcontroller. I want to know how I can bypass this microcontroller so that I can control the LED with a separate current. Would I use transistors to switch between the ...
1
vote
1answer
97 views

I am failing z-parameters, but I don't know why

I need your help to see where am going wrong. A two port network driven at both ports such that the port voltages and currents have the following values: \$Z_0\$ = 50 ohm \$V_1\$ = 10 < 90 - ...
1
vote
1answer
112 views

Can I get 7A of current from two 3.5A rated batteries (without an increase in V)?

I have two variable batteries with the following specs: Li-polymer Capacity : 20000mAh / 74Wh Input (for charging) : DC 15 - 19V (1.3A max) Output : DC 12V / 4A DC 16V / 3.5A DC 19V ...
1
vote
2answers
208 views

Connecting two capacitors in parallel

Two capacitors are parallel connected with an open switch. Both have a different capacity in which: $$c_1>c_2$$ and both charged with a different voltage $$v_1\neq v_2$$ and now we close the ...
2
votes
3answers
279 views

Parallel LCD screen to serial? (1 dedicated microcontroller?)

I'm a newb with electronics and was wondering if there's an IC or PCB that could convert a parallel LCD connection to Serial so I can use 2 wires to communicate with the screen using an arduino and ...
0
votes
3answers
95 views

How to gauge resistance on parallel circuit with step down buck regulator

I'm trying to create a circuit with two loads in parallel ( essentially piggy backing one circuit on the power supply of the other ). Circuit 1, the main circuit requires ~900ma at 12v. Circuit 2, ...
5
votes
3answers
411 views

crystal oscillators connected in parallel

why there are two crystal oscillators connected in parallel in the circuit above? i am familiar with the configuration of Q2( look at the schematic) but what is the purpose of Q3? do i really need ...
1
vote
2answers
116 views

Connecting nine LEDs

I am making a small project for myself but have very limited knowledge on electrical engineering (V=IR is about all i know). I want to power nine LEDs (max 28 mA, 2.25V) with one battery. Do i connect ...
2
votes
3answers
272 views

Can someone explain this simple schematic? (capacitor with voltage regulator)

Please understand that i am actually a really beginner in electronics. I found a really nice topic on how to create a 5V DC from a 9v power supply. All is ok. But in order to smooth out ripple, the ...
0
votes
3answers
109 views

Why does a voltmeter show voltage drop

Consider this circuit. What would I get if I measure over R1? It should be less than 12v, right? But then what volatage is LAMP1 running at? Is it still 12v, or is it the voltage I measured across ...
1
vote
2answers
271 views

Why does a voltmeter read lower across a load than across a supply?

From the Wikipedia article about series and parallel circuits: As an example, consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one ...
1
vote
1answer
151 views

Can I use two LMD18200 in parallel?

I'm building a DCC booster that at present uses one LMD18200 as per the circuit diagram. This gives me a continuous current draw of 3A, however I'd ideally like much more amperage (since I'm running a ...
1
vote
2answers
147 views

Paralleling of 2 power supplies with different voltages

I have 2 full bridge dc-dc converter from 12 to nearly 170 volts. each one are designed to 250 watts... I am designing the transformers and is very complicated to make exactly equals by homemade and ...
0
votes
2answers
145 views

Series - Parallel Resistor Calculations

Hi, I would be very grateful if anyone could shed some light on the below diagram as I'm trying to calculate the total resistance between A and B in this series parallel configuration. 10 and 20 ...
1
vote
4answers
126 views

Finding voltage in series-parallel

I'm working my way into an Electronics Technician career diploma and have came across a question that is kind of throwing me for a loop. I'm kind of confused on which resistors would be considered ...
1
vote
1answer
356 views

Series and parallel Lipo question (20,000mAh capacity)

I got a battery bank from China and it says in the back that the rated capacity is 20,000mAh (3.7V). After some use (charging my laptop) I decided to open the thing and I noticed four cells of 5000mAh ...
3
votes
2answers
359 views

Which interface is better for my OLED displayer?

I have a 0.96 inch 128x64 Yellow-Blue oled display module like this: OLED module and i want to use of it. The Driver is SSD1306. When you see in the SSD1306's datasheet you know it support 8-bit ...
-2
votes
2answers
75 views

Trying to visualize the wording of a question about finding the resistor that carries the highest voltage

I know how to find the higgest current in the resistor, it's just the visual that I'm second guessing. This is the question. This is the what I drew from it
1
vote
2answers
118 views

If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts

If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts, it won't affect the voltage. I also noticed that when ...
1
vote
1answer
182 views

Programming several AVR MCUs simultaneously? (with parallel)

I was able to program three ATMEGA32 simultaneously using ISP. In your opinion, can I program several AVRs at once with parallel? Unfortunately, I do not have a parallel programmer. Can you test ...
0
votes
1answer
92 views

Can I charge multiple identical devices in parallel from on transformer

I have four identical devices (HDD enclosures), each requiring 12V, 2000mA. Each of them came with their own power supply/DC transformer, but they are fat and chunky, and if possible I'd like to ...
-4
votes
1answer
151 views

How to Calculate battery drainage from a set # of LEDs

I will be wiring 18 LEDs to three 3.7V batteries(600mAh) in parallel. 10 of the LEDs are rated at 4.5V with 40mA and 8 LEDs are rated 3V with 20mA, how long will these 18 LEDs run on the three ...
-6
votes
3answers
383 views

What is the effective capacitance of this circuit?

I'm trying to work out, in general terms, the effective capacitance of this circuit between Out_1 and Out_2: What is the effective capacitance of this circuit and will the resistors affect the ...
1
vote
2answers
95 views

Parallel circuit

What happens if i connect 2 or more similar 12 volt and 5 amperage electrical adapters in parallel to a single load to avoid power outage and continuous power supply. Volt= 24 or 12 Amp = 5 or 10 ...