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Questions tagged [dual]

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1answer
29 views

Dual Comparators connection that affect the design

If we use a dual in package comparator Example LM2903 and do use only one comparator, what should be done with the other one. It is sure that paralleling the two comparator will cause instability and ...
0
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0answers
22 views

Combined a 555 dimming circuit with a 555 blinking circuit into a 556, LED flickers during dimming

As the title says, I have put together 2 555 circuits (dimming and blinking) into an NE556. I added a switch to toggle between blinking and dimming and used it to drive an LED. However, I noticed ...
2
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3answers
381 views

Supply current of negative rail

I'm using an LTC1983ES6-5 to provide a negative rail for both a MAX4311 and a MAX4395. LTC1983 provides up to 100 mA, but I cannot find in the other datasheets how much current is required for the ...
0
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1answer
42 views

Dual supply PCB layer stackup

My PCB is powered from USB port and includes Recom RKZ0505D for powering dual-supply OPAMPs. Recom gives +5V and -5V outputs. So I have: Top signal & components Bottom signal & components GND ...
-1
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1answer
63 views

Altering schematic for adaptor

I am trying to make a PCB for the attached schematic (mixer.jpg). Rather than run on 2 9V batteries, I would like to plug it into the wall using a +9 / -9V DC power supply. Do I need both diodes and ...
0
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1answer
48 views

Coupled DC/DC-modules - correct input filtering

According to the support from TracoPower I use two THN-30WI modules (­±15V) in conjunction as shown below (without each C1 and C2) to produce ±30V. This works but I get a lot of noise. The ...
0
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2answers
80 views

Dual power supply with BJT. How to do tracking without opamp?

I'm making a 0-±12V 20mA supply for breadboard. Circuit simulates fine with ltspice. How to implement tracking (or tracking ratio) WITHOUT opamp? I found a schematic here https://groenholdt.net/...
0
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1answer
150 views

i want to duplicate a signal generator output

I want to duplicate signal generator output to dual. since i want to use same signal to two different place. Is this possible without amplifying and inverting the signals. Let me share some circuit. ...
2
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3answers
290 views

Dual power supply with two boost converters

I currently have a dual power supply, that supplies +/-15V. One -output of the PS is connected to the other channel's +output (GND). Now, the problem is that I need +/-50V. I bought two step-up boost ...
0
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2answers
74 views

Replace lamp in old amplifier

I am trying to replace a fried lamp in my very old amplifier (a Dual CV 1280 Integrated). As I essentially only use the mode that is indicated by the fried lamp, I thought I could just switch it with ...
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0answers
182 views

Why does this buck boost with dual MOSFETs fails output at certain input voltages at light load?

Buck boost design A buck boost converter for 11A 45V output and 33.0-55.0V input has been designed using the Webench Power Designer. The LM5176 based PCB design was adapted for dual MOSFETs (4 times ...
2
votes
1answer
281 views

Virtual ground before or after low noise LDO?

I have two boards (microphone amplifier and speaker driver) that require +/-15 VDC. The max current required for the boards is 500 mA. Since low-noise dual power supply devices are hard to come by, I'...
1
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2answers
1k views

Dual Power Supply (Two 9V)

I am Not Good At This, and I am trying to breadboard this circuit here: http://www.instructables.com/id/DIY-EEG-and-ECG-Circuit/ But I am stuck on the power supply. The instructions state: ...
0
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2answers
152 views

Dual power supply circuit dropping voltage on applying load

I'm not an Electonics professional, and hope someone can explain why the circuit below, I've used to build a dual rail +15v,0v, -15v Power Supply drops voltage down to about -7.7 volts when connecting ...
1
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2answers
1k views

Complementary Transistor Pair

I am wondering, why is there no complementary transistor pairs to buy, since their use as individual devices is pretty common in audio amplifier applications. So for complementary transistor pair it ...
0
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2answers
83 views

How to turn off a higher supply from a lower one? [closed]

I have a circuit powered by two 12V batteries in series (total of 24V). When switch A is ON, my circuit powers a regulator that outputs 5V to a board I'm using. I'd like to add a second switch (switch ...
0
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2answers
242 views

How can I use a dual 4-channel analog multiplexer independently?

I have a CD4529BCN Dual 4-Channel Analog Data Selector (datasheet). Here is the truth table: Here is the problem: I have two sensors which are resistive. I want to read their voltage via a ...
2
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2answers
1k views

Dual Supply from single 24v dc source and 12v regulator

I was thinking about different ways a dual supply could be created, and I was wondering if something along the lines of what I made in this schematic would work. I don't have any kind of formal ...
0
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2answers
95 views

Back feeding when connecting one side of circuit to differential op-amp

simulate this circuit – Schematic created using CircuitLab I am building four 30v voltage sensing circuits to measure battery+/battery-, load+/load-, battery+/load- and battery-/load+ voltages ...
0
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0answers
207 views

Principle for converting dual power supply to single

I was recently attempting to build a voltage controlled oscillator from this website: http://www.schmitzbits.de/vco4069.html. I struggled with it, for various reasons, and eventually found this ...
0
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1answer
525 views

Capacitor changing output voltage from 12v to 20v [duplicate]

I have a transformer with two output coils I have wired them together in series and used the connection between them as 0v and used the other two leads in a diode bridge rectifier. Without any filter ...
4
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3answers
939 views

How to power one fan with two different power supplies individually

I have two systems that run on separate power supplies and turn on independently of each other.The issue here is that each system needs to be cooled by the same cooling fan. So I need to know if there ...
6
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3answers
2k views

dual potentiometer wired in parallel

I'm trying to understand if those two circuits are 100% equivalent. I mean, if I use a dual gang 100K linear potentiometer, and wire it like VR1A-VR1B, do I get a single potentiometer exactly like ...
1
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2answers
679 views

On RS Latches (or Flip-Flops), NOR or NAND, via Duality Principle [closed]

Fig. 1 Duality Principle simulate this circuit – Schematic created using CircuitLab ...
1
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2answers
962 views

How to obtain a dual power supply ±2.5V from a battery for a portable system?

I’m working on a portable system that uses a microcontroller and an analog/digital converter. I want use this ADC in dual power supply mode so I need a ±2.5V . In my previous project, the system was ...
1
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2answers
503 views

2 dc-dc boost converters to create dual power supply

I'm doing a project with a Silicon Photo-multiplayer where the breakdown voltage when negatively biased is -25V. I was wondering is there anyway to connect two DC to DC boost converters to give me a ...
1
vote
1answer
252 views

Initial voltages of capacitors using mesh currents analysis

simulate this circuit – Schematic created using CircuitLab The book I'm reading is noting that I should recognize the initial voltage across the \$C_1\$ capacitor is \$10 V\$ but I can't see ...
2
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3answers
9k views

Switching between two power sources

I am designing a circuit, which can use either 5V from USB, or some higher voltage (7-12V) from a battery. If both power sources are connected at the same time, I want some kind of electrical switch, ...
1
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0answers
168 views

Flyback diodes for motors wired in parallel

When driving two DC motors wired in parallel, do they each require their own flyback diode or can they share a single diode?
4
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2answers
2k views

Building a dual-rail, regulated DC power supply: 1 diode bridge & center-tapped secondaries, or 2 diode bridges and separate secondaries?

I'm looking to build a dual-rail, regulated, 18VDC power supply based on the 78xx and 79xx regulators. The circuit is inspired by AMB Audio's sigma25 (amb.org/audio/sigma25/) and sigma26 (amb.org/...
0
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2answers
91 views

Reduce number of switches for amplifier with two power sources

I am building a bluetooth speaker with two power sources: AC power supply and LiPo battery with a charging module (BMS PCM). As you can see from the diagram I have three switches. The goal is to ...
2
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0answers
1k views

Design for a balanced (positive and negative) HV DC regulator

I'm trying to design a high voltage DC regulator for driving a PZT that will provide both +200 and -200 V outputs referenced to ground. The input is a rectified AC waveform that will provide UK mains ...
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1answer
490 views

Convert 220V AC to give out TWO 12V DC 3 amps [closed]

I need an output of two 12 v dc 3amps , how can do it with a single transformer ? Well i am sorry for i framed the question badly! I have an appliance that need needs 12v 2amp for one component (...
4
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2answers
1k views

Can Dual BJT packages be reliably used as Current Mirrors

Say I need current mirrors, can I just use Dual NPN packages? I know that if multiple BJTs are manufactured in a die, they can pretty much be guaranteed to have the same spread. Or, should I just ...
0
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1answer
1k views

STM32F427 live firmware upgrade

I am trying to "read-while-erase" and "read-while-write" with my stm32f427 dual bank flash for firmware upgrade. what I need to know is how can the program dynamically figure out which bank it's ...
1
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1answer
257 views

What is this circuit called? (Dual of a boost converter)

A boost converter is a circuit that uses power from a voltage source, to act as another voltage source with a greater voltage. To conserve power, it draws more current from the input than it provides ...
20
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2answers
2k views

What is the dual of a diode?

A diode has an exponential I-V curve. To a first approximation, it will pass whatever amount of current is required to keep the voltage across it constant. Is there a passive component that will (...
2
votes
1answer
334 views

Chassis Grounding a Bipolar Floating Power Supply

I'm building a simple function generator powered from a 24V AC wall adapter. I've rectified the incoming AC to 24V DC using a full wave bridge and an LM317. I intend to split the supply into +/-12V ...
0
votes
1answer
907 views

How do you construct a dual-input switch using transistors?

I have part of a circuit that I wish to disable power to depending on two input signals (digital, active low). How do I realise this, preferably using transistors? Application The two signals comes ...
2
votes
1answer
402 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article http://www.ti.com/lit/ml/...
1
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3answers
102 views

How can I replace this 5565 SRAM with a dual port SRAM?

I have an existing device (an arcade CPU board) that stores some data in a 5565 64-Kbit SRAM. I want to replace it with a dual-port RAM so I can read the data with a microcontroller. I don't need to ...
0
votes
1answer
53 views

dual vs single rail speaker excrusion

Is there a difference in speaker total excrusion if i using single and dual? Like if single it's just excrused from 0mm to like says, 5mm. and if it was dual rail i'll go from -5mm to 5mm? If yes ...
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votes
1answer
360 views

Dual-axis Inclinometer

Im working on a project where im designing a device that can be worn on the arm (using the elbow as the fixed angle). Once the device measures 45 degrees I want to program it to vibrate. My question ...
1
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2answers
3k views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
0
votes
1answer
79 views

dual ramp voltmeter meaningfully displaying the microvolt digit

How can a common dual ramp voltmeter meaningfully display the microvolt digit when measuring a DC voltage ridden by a 50 Hz signal of several millivolts captured from the power distribution network.
2
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2answers
2k views

How do I switch between primary battery and backup battery, if the primary battery drops below operating voltage or get disconnected?

I have low power system which requires dual batteries to overcome the loop holes in the current system. Currently I have two batteries: Primary Battery Li-Ion 3.7V 1800mAh and a secondary battery Li-...
2
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0answers
189 views

What should I do with the unused diode in the SOT-323-3 (SC-70-3) package?

I'm planning to use one of this diode in my circuit. But the package contains two of them. I chose it mainly because of its 3ns reverse recovery time. How do I use them in my circuit? I have three ...
1
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2answers
358 views

Voltage not dropping in circuit

This schematic shows the circuit that I'm trying to build. At the moment I'm not using V2, as I'm having a problem with V1. From my understanding the diode should drop the voltage by about 0.7V, and ...
0
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1answer
133 views

Is this a dual cap?

As you can see below , this cap is marked 8 + 8 uf. Does this indicate that it is a dual cap? There only seem to be two actual terminals, as you can see here , although there are also three lugs ...
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3answers
3k views

Will a dual car charger that shows a maximum output of 2000mA produce a 2.1A current?

I have a dual car charger that states input is 12-24VDC and Output is maximum of 2000mA, but it is supposed to have one port charge at 1A and other port charge at 2.1A. Is the 2.1A output possible ...