Questions tagged [dual]

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Dual LED Configuration [closed]

I'm looking for a dual color red/green LED that is not common-anode, not common-cathode, but common anode-cathode (anode of one LED shares a pin with the cathode of the other LED). Can anyone list a ...
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DC current injection: dual PSU

I’m powering a 1KW array of 60V LED with electricity from the network (220V AC to 60V via Meanwell RSP-2000 DC-DC converter). To save power over the day I want to supply the system with a parallel 1KW ...
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Complicated battery boot jump

2x 300watt solar with 2x 12volt battery’s … I want to have a 3 phase switch. Left switch is battery 1 Middle switch is both battery’s off. Right switch is battery 2. What switch that can carry 1000 ...
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113 views

What does dual DAC mode mean for this microcontroller board?

I have a STM32 development board with this manual, and regarding its two DACs somewhere in stm32f4xx_hal_dac.c file, the following is written: ...
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2 answers
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Dual power supply switch-over LED circuit

I need a simple circuit that work with two LEDs to do the following: When a 12VDC power supply is on, LED1 must be on and the LED for the battery LED2 must be off. When the power supply is of LED1 is ...
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49 views

Combine multiple power supplies with shared negative

I have a computer power supply that supplies 24V, 12V and 5V. The 24V rail is dead but all other outputs work. (I need to figure out what's busted). Can I add a 24V power supply alongside the existing ...
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What do these dual DC rating numbers on my Casio PB-2000C mean?

All devices I own except one have only one rating that matches what the PSU says, for example "12V ⎓ 2.5A" and that means if I have to get a replacement PSU it has to be 12V and at least 2....
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1 answer
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Can I operate 2 electromagnetic locks using the same power supply?

I'm using this power supply: Specs: Input Voltage: AC90V-AC260V 50-60HZ Output Voltage: DC12V Momentary Current: 3A/5A Persistent Current: 3.5A To operate my ...
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2 votes
3 answers
49 views

Connecting two op amp circuits each of which use dual supplies, but where the two supply voltages differ

One of the op amps uses +- 12 volts and the other +- 5 volts. With only one circuit, I understand that the common ground for the entire circuit is midway between the two supply voltages, but when the ...
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2 votes
2 answers
283 views

Common ground with 2 transformers

Beginner question so please go easy on me. My question is around what is the correct way to have a common ground reference on a circuit at that 2 different voltage sources. the below schematic is a ...
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Non-inverting unity gain buffer appears to be inverting

I have constructed a circuit which uses two non-inverting unity gain buffers on one chip as stage seperation. I'm using a TL072CP chip with dual op amps on it and have followed the datasheet design ...
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Power supply with three pins on the output, why? [closed]

I opened up the power supply to a HP printer and I see that the output has three pins. I measured voltage on one pin to ground and it shows 8.3V. The adapter says: Output 24V @ 1A. Is this a dual rail ...
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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 ...
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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.
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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 ...
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2 answers
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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 ...
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  • 317
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1 answer
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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 ...
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2 votes
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379 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 ...
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1 vote
2 answers
222 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 ...
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2 votes
3 answers
475 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 ...
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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 ...
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-1 votes
1 answer
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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 ...
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1 vote
2 answers
575 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 ...
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2 answers
308 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/...
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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. ...
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2 votes
3 answers
1k 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 ...
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2 answers
127 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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353 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 ...
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2 votes
1 answer
539 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'...
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2 answers
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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: ...
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1 vote
2 answers
402 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 ...
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4 votes
2 answers
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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 ...
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2 answers
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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 ...
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770 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 resistive-...
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4 votes
2 answers
3k 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 ...
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2 answers
261 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 ...
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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 ...
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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 ...
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3 votes
3 answers
3k 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 ...
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6 votes
3 answers
4k 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 ...
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1 vote
2 answers
983 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 ...
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2 votes
2 answers
2k 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 ...
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1 vote
2 answers
720 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 ...
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1 vote
1 answer
665 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 ...
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  • 143
5 votes
3 answers
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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, ...
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0 answers
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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?
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7 votes
2 answers
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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/...
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2 answers
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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 ...
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2 votes
1 answer
2k 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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  • 470
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1 answer
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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 (...
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