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

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3answers
67 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
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1answer
25 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 ...
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1answer
94 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 ...
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2answers
46 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. ...
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2answers
47 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 ...
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2answers
64 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 ...
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0answers
75 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 ...
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0answers
45 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 ...
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1answer
73 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
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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 ...
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1answer
74 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 ...
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2answers
84 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 ...
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1answer
102 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 ...
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1answer
46 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 ...
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1answer
129 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 ...
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3answers
363 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 ...
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1answer
99 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 ...
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4answers
173 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, ...
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3answers
190 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 ...
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2answers
123 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
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1answer
179 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:
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4answers
136 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 ...
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1answer
95 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 - ...
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1answer
110 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 ...
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2answers
194 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 ...
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3answers
237 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 ...
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3answers
91 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, ...
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3answers
395 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 ...
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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
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3answers
256 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 ...
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3answers
101 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 ...
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2answers
242 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 ...
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1answer
143 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 ...
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2answers
145 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
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2answers
139 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 ...
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4answers
124 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
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1answer
341 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 ...
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2answers
322 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 ...
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2answers
71 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
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2answers
115 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
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1answer
179 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
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1answer
87 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 ...
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votes
1answer
147 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 ...
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3answers
340 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
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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 ...
2
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1answer
224 views

Parallel->Series switches for capacitor bank, only one charges

Here's my goal: To create a capacitor bank to dump a load in to a load resistor/inductor, pulsed, without using switches and keeping it as isolated as I can from myself. Here is what I have so far: ...
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1answer
105 views

MM5452 with 4 digit parallel 7-segment LCD display

I have a question regarding the backplane connection for the MM5452. From this data sheet: MM5452/MM5453 Liquid Crystal Display Drivers It says that the backplane pins on the MM5452 connects to a ...
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4answers
3k views

Transistors in parallel

I want to use several transistors in parallel to control current through a load. This is to distribute the current through the load across the transistors so that individual transistors with a rated ...
1
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1answer
81 views

Parallel to less parallel without throttling

I'm modeling a camera-serial interface in Verilog. My design takes video frames in, packetizes them in a certain format, and then distributes them among 1 to 4 parallel lanes. Each lane is 8 bits ...
4
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2answers
358 views

Can I use more diodes for lower voltage drop and higher current?

The problem is simple: I have bought an UBEC, which should accept 7,6V from my battery and give me 5V to power my electronics. But the one I bought does not give me 5V, but 5.3V - that could cause ...