Questions tagged [dual-supply]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
58 views

Bipolar 2s1p Li-ion array BMS and charging

For powering my portable circuit, I need a bipolar power supply of ±2.5 V. The circuit is low-power, but requires very precise power. For its stabilization, I am using ADM7154 regulators for positive ...
nighma's user avatar
  • 1
0 votes
0 answers
27 views

Can a common mode choke be used to filter a SMPS dual power supply?

I have a switched mode dual power supply with +12V, GND and -12V outputs. I'm seeing a lot of high frequency noise on the output of this power supply that I'd like to attempt to filter out. The noise ...
Jordan Melo's user avatar
4 votes
4 answers
260 views

Single supply positive-only signal amplification using INA126 (two op-amp in-amp)

I need to amplify a 0.15-0.8 V very low frequency signal to the 0-10 V range of an ADC. I'm having a hard time figuring out why an INA126 does work as expected with dual supply but seems not to work ...
umarcor's user avatar
  • 153
0 votes
0 answers
56 views

How can I sum the output of the two opamps and multiply the voltage swing to +2vcc and -vcc

I have a VtoI circuit that you can see in the figure below. According to this circuit, I can receive a maximum sin current of 4 mA with a maximum load of 5 kΩ. Considering that the supply voltage for ...
raha's user avatar
  • 1
0 votes
0 answers
53 views

High negative voltage cut-off for op-amp from dual-rail power supply

In the picture I have a circuit that prevents reverse polarity and cuts the voltage with respect to the Zener diode (15 V) as a voltage reference for positive voltage output. How do I apply the same ...
HuracanWind's user avatar
1 vote
2 answers
206 views

Why is my 5 V water pump making my 7805 regulator fail?

I have a 12 V, 5 A dual power source with ground in the middle. A 7805 regulator with two 10 μF capacitors is connected to it, outputting 5 V. I have a 5 V mini water pump connected to that 5 V line ...
José Suárez's user avatar
3 votes
1 answer
274 views

12v LED lights powered by 2 different circuits

I am wiring some automotive LED lights (underglow), and currently have them wired from the 12v ACC power (on when ignition is on), with a 5-pin illuminated on/off rocker switch on the dash. It works ...
GoleeMD's user avatar
  • 51
0 votes
1 answer
143 views

Using MOSFET to switch dual power supply with common ground as a PWR/GND DPST switch for each power line

I have started a new project, an automatic firing system for fireworks, powered by 2 lead-acid batteries (12V). The batteries are connected in series with a common ground (GND), so the power ...
cristyan120's user avatar
1 vote
1 answer
45 views

Dual Power supply switching

I have two PCBs: PCB1 and PCB2. Both PCBs have a 5 V power supply connectors. Both PCBs are also connected with each other via extension connector. When 5 V connector of PCB1 is supplying power, then ...
Zunuran Nasrullah's user avatar
0 votes
2 answers
58 views

Dual supply circuit

I am designing a circuit with 2 48V power supplies to feed a load. My goal is to give priority to Supply 1 when available since I need the load to be fed by only one supply at a time. This is what I'...
Roy's user avatar
  • 25
3 votes
3 answers
155 views

Seamless power source switching for a microcontroller (ATtiny85) [duplicate]

I'm seeking guidance on accomplishing seamless power source switching for a microcontroller (ATtiny85). My objective is to seamlessly transition power input between two distinct sources (Raspberry and ...
Anand's user avatar
  • 31
0 votes
0 answers
25 views

18650 battery concurrency

I would like to build a small circuit with a photoresistor and relevant ICs that switches a larger circuit that enlights Leds utilizing about 1A from a 18650 5V power bank of new batteries. How safe ...
Puvitar's user avatar
  • 59
0 votes
1 answer
40 views

Dual-Power Sourcing for 15MW Electrolyser: Wind Farm and Electrical Grid Feasibility [closed]

I am part of a team working on a 15MW electrolyser project comprising six 2.5MW containerized electrolysers. This setup will be positioned near a 20MW wind farm, and there is also the potential for us ...
Ricardo's user avatar
1 vote
0 answers
21 views

Can I run a fuse block on different power supplies connected to the same terminals, depending on mobile vs. AC power availability?

I am wiring a trailer lighting system and I want to be able to run off AC power when parked at home, but run on a AGM deep cycle battery when AC power is not available. I've attached a drawing of the ...
MistreJ83's user avatar
0 votes
1 answer
110 views

Unbalanced voltage accross full wave bridge rectifier

This an HiFi amplifier from end of 80's. On the schematic below, I have asymmetrical voltages on the DC, +38 V and -40 V (on the leads of 1000 uF), instead +/-40 V, or +/-38 V - now this is also the ...
Erden 's user avatar
0 votes
1 answer
29 views

switching multiple supply voltages on same low-side darlington array IC

Say I have an MCU switching a couple SSRs using the ubiquitous ULN2803 at 5V on the "common" pin, but I'd like to switch a 12V mechanical relay with the same chip as well. Checking the ...
Joe's user avatar
  • 199
0 votes
0 answers
32 views

Is this PSU configuration correct for dual power rails and a virtual ground?

I am pretty new to electronics, and I am just not understanding if I have the right configuration on my Tektronix PS2502g PSU. I am trying to supply voltage to a LM741 op-amp but do not appear to be ...
Integration's user avatar
0 votes
1 answer
153 views

How to parallel 2 boost converter as positive/negative dual rail power supply?

I read here circuit which can generate positive/negative dual rail power supply with buck converter: I'd like do it with boost converter: Converting +5V to +5.5V and -5.5V with 2 boost converter. I'...
curlywei's user avatar
  • 651
0 votes
3 answers
241 views

Split supply from 24V power supply using uA741 opamp

I want to connect a 0-3V analog sensor output to the 0-10V analog input of a PLC. In order to avoid losing resolution, I have amplified the sensor signal using a non-inverting amplifier circuit (based ...
bardulia's user avatar
  • 407
2 votes
2 answers
122 views

Converting AGC Schematic from Single Sided to Dual Sided Supply

I am working with the attached circuit, sourced from here: Original This circuit is designed for a single sided power supply and has worked very well for me in the past. For a new project, I would ...
Telluride's user avatar
0 votes
2 answers
113 views

What MOSFETs should I use in this configuration?

Here is a configuration of MOSFETs which I believe allows for two different sources to supply power to the same load. This diagram was originally found here. The primary source is connected to the ...
Georgia088's user avatar
3 votes
2 answers
1k views

Dual voltage power supply

I am working on my first power supply design for +12 V and -12 V output. The +12 V is working perfectly. The negative output at the rectifier is only -1.87 V. I have checked the wiring, replaced some ...
Josher's user avatar
  • 33
1 vote
1 answer
80 views

Do dual supply voltage buffers with dual outputs exist?

I need a dual voltage supply (+-15V) voltage buffer for my design. This component will receive a signal (varying from -10 to 10V) and transmit it with gain=1 (line driver, voltage buffer or voltage ...
wertyu's user avatar
  • 33
0 votes
2 answers
44 views

Would not this buffer reduce signal resolution for sensor driver? (recommended schematic)

I am following this design. For my application, the LVDT driver would give me a +-10 V output. Analog Devices recommeds a buffer for clearing the output signal of the driver. The thing is that they ...
Developing Electronics's user avatar
1 vote
2 answers
202 views

Designing dual tracking regulator low noise PSU

I want to design a power supply with the following constraints Inputs 19 V - 0 - 19 V secondary & 9.5 V secondary - A transformer I have ready for the project, primary 230V . Output +15 & -...
ahmod3's user avatar
  • 11
3 votes
1 answer
2k views

Op-amp dual supply methods

To power an op-amp with a dual supply (+Vcc and -Vcc) you can use two power supplies connected in series. I would like to find an alternative and less expensive way to do this as (in my project) the ...
philfs's user avatar
  • 73
0 votes
2 answers
151 views

What is wrong with this dual supply op-amp cascade circuit?

At the input I have a rectangle signal, R1 and R2 are 1 kΩ and 220 kΩ on the first cascade and second cascade (amplification factor 220). At the output I have zero. Need I something like this on the ...
Viacheslav Popika's user avatar
0 votes
0 answers
52 views

How to use multiple supply options in the easiest way for STM32?

I designed a custom board with STM32, ADC, and RS422 transceivers. The estimated current consumption of all the IC on the circuit is not more than 200 mA on 3.3 V. in the operational mode, the board ...
Knowledge's user avatar
  • 411
4 votes
0 answers
73 views

Grounding issues when using multiple supplies

I have a few questions about how grounding on a PCB and to an enclosure should be done when using multiple supplies. I have read a number of similar questions/answers from multiple sources with the ...
Muzza's user avatar
  • 141
0 votes
3 answers
300 views

Confusion with dual power supply negative output current ratings

To summarize, I came up with the question when looking for an alternative to an expensive dual supply. This deflection system requires a +/-15V power supply, but its own supply is super expensive. I ...
user1999's user avatar
  • 1,495
3 votes
4 answers
935 views

Output signal distortion from op-amp

I am currently using a TLE2144, and the input signal of 600 kHz, 4.5 Vpp is generated from a function generator. Using a voltage follower with TLE2144, I was able to get an output of 4.5 Vpp with an ...
Sam Shurp 's user avatar
1 vote
1 answer
117 views

How to draw power from one of two sources according to priority, with indication for used source?

If two 5V power sources exist, one being always on and the other not (such as an ATX powersupply's standby 5V and "on" 5V rails), how could I draw power only from the "on" rail ...
John Schultz's user avatar
1 vote
2 answers
85 views

Circuit with dual batteries used in sequence

I have a circuit that is currently powered by two 18650s connected in parallel via a TP4056 USB charging and protection module. The circuit uses very low power and therefore it lasts for weeks if not ...
Gavin's user avatar
  • 11
-1 votes
1 answer
154 views

Using 12V output as ground in 24V power supply to form +/-12V rails

I have a power supply which outputs both +12V and +24V, Here's a photo: Can I use the +12V as ground in my circuit to have a -12V(from 0V)/+12V(from 24V) output? The load on the -12V output will be ~...
a12's user avatar
  • 1
0 votes
2 answers
147 views

Low current, +- 20V supply from 5V [closed]

For my application I need +20V and -20V, at a low current, 10mA but probably 1mA might be good enough - difficult to say until I try. I start with 5V provided by a common USB power supply. I have read ...
Alessio Sangalli's user avatar
1 vote
3 answers
1k views

Switching between power sources part 2

So I'm trying to switch between two power sources, a 24 V battery and a 24 V power supply, I'd love to use the circuit mentioned in a another thread. Switching between two power sources I am having ...
TimWolf's user avatar
  • 13
3 votes
2 answers
2k views

How to Wire Potentiometer Wiper

It appears as though the wipers are unwired in this schematic. Are only the far left and far right pins wired in this circuit?
David Graham's user avatar
0 votes
0 answers
100 views

Changing dual supply to single supply for the following circuit

The following circuit has a +-15V supply. What will be the circuit modifications (only in the final stage the driver and the power amplifier) if I want to use a single voltage source with a ground ...
Waqas Ahmad's user avatar
1 vote
3 answers
67 views

How to get sufficient current out of two parallel DC/DC power supplies?

I have two RT8299AZSP (24V adjustable DC/DC switching regulators) chips connected in parallel. They are each rated for 3A, and provide the power to drive a high power UV LED (can't say too much about ...
InBedded16's user avatar
1 vote
1 answer
85 views

Two power supplies, but the 5V one turns off the 3.3V one

Is it possible to have two power supplies, where one cuts off the other one? And if so, how? I have a circuit which regulates a 16V supply to 3.3V and powers a microcontroller. However I would also ...
jonas's user avatar
  • 309
1 vote
2 answers
153 views

Unexpected voltage drop in linear dual supply power regulator

I am attempting to implement a linear dual power regulator circuit using the 7805 and the 7905, as shown below. It almost works, except that the voltage difference from the ground rail to the positive ...
classic_sasquatch_behavior's user avatar
-1 votes
1 answer
240 views

Power a circuit with with 12V barrel jack and USB 5V

What if I use a Schottky diode at both the power rails in forward voltage mode and connect both the supplies? Will it damage my circuitry? Reverse current will not damage my device because of the ...
Mudassir Ahmad's user avatar
0 votes
2 answers
182 views

Voltage follower for signal generator ground issue?

I'm trying to amplify the signal from a signal generator to get a high frequency AC current in a resistor. My circuit is below. However whatever voltage I put on the signal, the output seems to be ~3....
Oliver Walters's user avatar
0 votes
1 answer
79 views

Calculation of Power consumption of opamp with positive and negative voltage

I used a single power supply for an op-amp, and I could see the current draw on the power supply. It was easy to determine power consumption using P = V * I. How about dual power supply (+-9V); to ...
Sam Shurp 's user avatar
0 votes
5 answers
3k views

How can I produce dual +-12V supply rails from a single 12V supply?

I designed transmitter and receiver circuitry, with LT1214CN op amps with +-12V rails, and now realized I'm limited to using a 12V external supply (I was asked to use it). I've considered possibly ...
Ian Edwards's user avatar
3 votes
3 answers
1k views

Best way to get stable +-9 volts AND 5 volt from a 9V DC source

I'm quite new in electronics, but I'm not scared to try it (Look Mum No Computer). So please bear with me and tell how to improve my asking. I am building a guitar pedal. It's a op-amp based parallel ...
Jesper Kragh's user avatar
0 votes
1 answer
337 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 ...
KERR's user avatar
  • 103
0 votes
2 answers
235 views

opamp with single power supply

I'm trying to build a 'panner' to mix two audio signals, basically a dry/wet potentiometer for an audio effect. It works as intended when I use a dual power supply like this: But stops working when I ...
brunobhr's user avatar
  • 133
0 votes
1 answer
188 views

How to connect the windings of a dual-winding transformer in series (dot convention)

I'm trying to build a dual power supply. I can find mains transformers that give me two (presumably unconnected) secondary windings of equal voltage, and if I connect them in series, I should be able ...
Stephan Neuhaus's user avatar
0 votes
1 answer
104 views

Any reason why the MIC920 op amp should not be used in SINGLE SUPPLY mode?

I understand that practically any op amp can be used in single-supply mode as long as the application (interface, measurement, etc) does not require dual-supply for specific reasons. Is there a ...
TommyS's user avatar
  • 135