Questions tagged [dual]
The dual tag has no usage guidance.
58
questions
-1
votes
1answer
35 views
Residual AC voltage after diode bridge in dual power supply
I'm building a +/-24V supply for my first hifi project but I'm having an issue. I use a dual output 28V toroid, doubled P600M diodes for rectifying (to distibute the load and lower heating), with two ...
0
votes
1answer
21 views
Identification of a sot363 dual transistor
Could you please help me in the identification of the 6 pins dual PNP transistors below.
Thank you in advance.
0
votes
1answer
23 views
What affects the current ratings on constant torque pole changing motors?
Two different motors, one is rated 1.49A on slow speed configuration and 1.43A on high speed. The other motor is rated 6.09A on slow speed and 6.99A on high speed.
These are constant torque pole ...
0
votes
2answers
515 views
Why does the Dual Speed Dahlander motor need a bridge in the fast speed configuration?
On the nameplate of the motor is a Delta/Wye-Wye configuration, meaning you supply the ones (U1, V1, W1) and leave the twos open to achieve the slow speed. And for fast speed you supply the twos and ...
1
vote
1answer
71 views
Circuit with dual power supply
Doing some reverse engineering to a PCB, I drew this part of the circuit. Looking into the datasheets, I found out the comparator (LMC6772) is able to drive the SCR (S6S2) by itself. But the designer ...
2
votes
0answers
71 views
What are limitations of Millers theorem for amplifier?
I mean to say that are the two circuits one original and other its miller/ drawn exactly equal in all respects or their are some difference in some respect if so please mention.
I am not able to ...
1
vote
2answers
80 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
votes
0answers
84 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
votes
3answers
408 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
votes
1answer
76 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
votes
1answer
74 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 ...
1
vote
1answer
173 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
votes
2answers
147 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
votes
1answer
312 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
votes
3answers
583 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
votes
2answers
85 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 ...
0
votes
0answers
239 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
357 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
vote
2answers
2k 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
votes
2answers
251 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 ...
3
votes
2answers
2k 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
votes
2answers
84 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
votes
2answers
446 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 ...
3
votes
2answers
2k 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
votes
2answers
138 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
votes
0answers
259 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
votes
1answer
621 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 ...
3
votes
3answers
2k 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
votes
3answers
3k 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
vote
2answers
779 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
...
2
votes
2answers
1k 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
vote
2answers
596 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
334 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
votes
3answers
13k 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
vote
0answers
182 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?
5
votes
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
votes
2answers
99 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
votes
1answer
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 ...
-1
votes
1answer
577 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
votes
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
votes
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
vote
1answer
274 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 ...
21
votes
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
383 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
994 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
419 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
vote
3answers
117 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
56 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 ...
-1
votes
1answer
385 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
vote
2answers
4k 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 ...
