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77 Threads found on Two Source Power Switch
hi, I want to switch on/off about +/-1A DC current using solid state components. the problem is in off-state this switch current should be in pico ampere range. the way I was thinking about is to connect two power n-mosfets source to source to allow bidirectional use of them. (...)
Hi All, I have two 220V power sources. I want to power my device with this. If One power goes off , the device need to switch to the other 220V source. Is there any IC's to do this?. Help me regarding this.
Hi I'm designing a circuit that works with both battery & USB. I want an analog switch like as 4066 with two channels to change the source of the circuit from battery mode to the USB mode whenever the USB cable is connected. Can you suggest any circuit or IC to do it? Thanks
Is there anything that i need to be careful of when putting two power MOSFETs in series? If I use two P-channel MOSFETs, is it as simple as connecting their sources together, their gates together, and using their drains for input/output? I looked for integrated circuits that incorporate this design but have not been lucky i
You will need a switch that can handle the power of the transmitter. Hittite IC company makes these. is a selection matrix. The problem with powering down the transmitter during receive is the time delay for off and on. Your system should tak
I want to set up a reversible fuel pump for hobby use, powered by a 12v brushed dc motor. Is there a way to wire it so that I can use two simple on/off switches such that one switch will run the motor/pump in one direction when selected on, and the other will run it in the reverse direction? I'd appreciate any help with (...)
Without going into details, my first thought is about the synchronization issue .. Why couldn't you use a couple of solid state relays (optocoupler+zerocrossing+triac) and switch the other source just the next comming cycle later after the loss of power from the primary source? In the wordt case scenariothe maximum loss of (...)
Take a look at the attached picture .. You can feed the audio signal directly to 10?F capacitor and remove two opamps which drive LEDs .. The bottom opamp will give you light signal (driving a bulb through a transistor) when an audio signal of certain level appears on the input .. Regards, IanP
Hello. I am creating a design with two very separate power supplies on two separate boards. One of them has power management from a dev kit and the other (mine) needs to be managed. I don't want my board to be powered when the other one is not so I want to gate the power to MY board by (...)
I am designing a simple circuit for my fishing boat that would allow me to switch between two batteries and several components (i.e I can use a fish finder on one while using the troll motor on another). I will be installing DC circuit breakers rather than fuses, but I am not too sure where to put them. Do I put them after the power (...)
Sure this is possible (this is how electric toothbrushes are charged, typically). First you need an AC current going through the primary coil. The other thing is you need to maximize the magnetic flux linkage through the two coils. This can be done, for example, by winding them on the same high-permeability core.
Thanks for your reply. DC UPS input voltage in 220VAC, nominal output voltage 24VDC. Use two SLA battery in series as standby power source. When AC dorps below 187VAC, power switches to battery automatically with zero crossover time. The max. load current is 20A. Battery capacity is 20Ah.
Maximum permitted switch on-state voltage, isolation in off-state and switching speed are additional parameters to know. A single FET with s bridge rectifier or two antiparallel FETs are a common solution. For short on-time, as specified, a transformer coupling of gate voltage could be most simple.
hello soppuse we have two different electrical power supply sources for one circuit i want the first source to supply the circuit and at the same time prevent(disconnect) the second source(battery) of the mentioned circuit but if the first source failed or disconnected form the circuit (...)
For 2 watts of power, it probably does not make a difference. So you have a signal source, a cable, a sp2t switch, and then 2 cables and 2 antennas. The only potential problem is if the two antennas are close to each other AND the cable length to the unselected antenna resonates at the transmit frequency. It might (...)
Hello, I recently bought a new entertainment center and unfortunately the previous owner modified the cabinet lights by snipping the end of the cord off and wiring it directly to a wall switch. I hate the way it looks with the lights off and would like to, once again modify it, this time by, converting the power source to batteries and (...)
(beginner) I got a 12V RFID reader that I want to use to activate a 12V door. The transponder puts out 12V as long as the key fob is in front of it but I want the door to stay open longer and I can't modify the circuitry inside the reader. I want to use a single 12V power source. Is it possible to make the reader activate a switch that (...)
Here’s project of simple toy ( similar to beetle bot robot), that can change ride direction after hit to wass. Movie exactly shows how it works. Construction: All construction takes 3 days. Costs – zero, all elements
Hi Simply use LTC4412 controller to switch between main load and battery using one or two mosfet. All the best Bobi
All you have to take care of is to isolate the two supplies. Else the lower voltage supply will be driven by the higher one. You can make the ground common, and add some circuit (or even a simple schottkey - low drop diode) to switch between the two supplies.
I have thought of an experiment I want to conduct. I will need to have a timer device which would accept two DC inputs & output (undetermined voltage, but low, 12 volt or less) and switch between them at a variable rate from about one second to about 60 times per second. So when one input circuit is off, the other would be automatically on. I would
switching power from two sources can be realized with 2 P-channel power MOSFETs .. eg. IRF5303 (low Rdson) .. Here is an article that describes this issue in a greater detail: Another option is to employ two high current diodes - one feeds p
Hi people, I hope I am in the correct section to ask this question. I'm a student from Malaysia. My situation is as follows: I am trying to utilize a AC heating coil (obtained from a hair dryer) and it operates on two different wattages; 1000W (for full speed hair dryer) and 500W (for half speed hair dryer). How it managed to scale down its volt
Your problem can be solved without any microcontroller by using an AC relay rated to the maximum load power. This relay can be controlled by the load as you wish. To actuate the relay, you can use a current sensor (you can make it from a small AC transformer by adding one-two turns of a heavy wire to it) which generates a voltage proportional to t
source: Konsola o Project by motykami I handle small disco parties (100-200 persons). Regular unwinding extender cables separately to every light point
The substrate diode is characteristic for power MOSFET geometry that have substrate and source connected. It's not necessary for MOS analog switches with a separate substrate terminal. If you wan't to use power MOSFET as AC switches, two devices have to be connected in an anti-series (...)
hi guys... i'm currently doing a project on two-switch forward converter power supply. with the circuit diagram given, i have to design/decide the value of the components for the transformer and the output filter part. i had went through few books and search online but non of them have details explanation and derivation of (...)
I'm a little confused by the circuit. There seem to be two inputs; a square wave and a sine wave. I also don't see a DC path between source and drain, or any DC power source. What is the circuit supposed to do? Where is the output? Oh, yeah, that's a good point! I didn't even look at the circuit! I was just making
As :pH has already pointed out... we have no idea what could be the difference between Vbatt and Vpwr. For instance, if Vbatt and Vpwr have almost the same dc voltage and Vpwr has very low ripple then you will need using the two non-connected terminals of the DTDP switch. Kerim
I made one with a single green l.e.d. in series with 100k resistor but the l.e.d. was damaged in two days You apparently forgot a rectifier diode or bridge rectifier.
Dear all, what is the most power efficient way to choose between two power sources? To be more precise, I have a solar panel with a 12vdc output and a 12vdc charger, two sources to charge a 12v battery, and want to be able to automatically select the solar panel as main (...)
Class F amp in microwave Design involves a matching network design at the fundamental frequency and load harmonics. The common practice is to present a short circuit at the even order harmonics, and an open circuit at the odd order harmonic. This 2nd and 3rd harmonic is usually adequate. Thus the gate voltage will be out of phase with drain curre
Hi I have a 5 volt supply and a 3.3 volt supply and i need a switch which can choose between those 2 supplies and give an output which is either 5v or 3.3 v.i want to have a mosfet switch.can anyone tell me which mosfet to use and is my circuit correct? 5V o------------------(mosfet)-----------
The simplest solution will be to build an OR-switch using two diodes, as shown on the attached picture ... Also see: :wink: IanP
Basically it consists of two sections. power supply and scimitt trigger around 555 timer IC driving output relay. 555 inverting buffer circuit (a NOT gate) NOT gate symbol The buffer circuit's input has a very high impedance (about 1M) so it requires only a few ?A, but the output can sin
I have an HDMI switch which uses a 12V 3A power adapter to feed the power supply board. From the power supply board 2 x 5V feeds go the mainboard. Each one has a 4-pin connector (one red and three black wires on each, looks like an FDD power connector). I measure 12V to the power board but (...)
Well, here we have two conditions: 1. 8 mA max primary power supply current from 16V source (P_in max = 128 mW), 2. Output power P_out = 150 mW. Hence the expected efficiency should be 117% :wink: Anyway, the low average current of 8 ma means some have to put quite large capacitor on the input of the SMPS to (...)
To jzaghal. I`ve disassembled many ferrite transformers for repair in microwawe owen. Just put a shortcut to all pins ( to avoid HV induction ), put it into mw-owen and switch on. Open the door every 3-4sec and try pull out the ferrite with two pliers. Attention,very hot!
For boost Regulators also there is another problem, inrush current during power up; since there is no switch between input voltage and output node, during power up a sin current will pass through the input inductor and after that a voltage of two times of input voltage will be produced in output node. for solving it usually (...)
basically there are two ways to generate negatives volatges from a positive source . A switching power supply with transformer or coil .. depending on your power requirements .. it can be as easy as a transistor and a coil. The second possibility is a "CHARGE PUMP " is basically an analog (...)
is there any company or manufuctrer for the air core coils with that range of power ... ? regarding the frequency range, i designed two harmonic filters and switch between them using the pin diodes ... the first filter ... from 45-75MHz the second filter from 75-85MHz
Thanks for the help! I used two 4600 chips to multiplex between my car's cd player and my portable mp3 player. Each 4600 chip has two switches NC and NO. NC switch in the two chip is connected to car's cd player while the NO switches are connected to my portable cd player. Because the (...)
This is static parameters : Rds responsible for power losses and heating MOSFET Ploss = Rds*Ids^2 Ids = maximum allowed current for your application. Vds = maximum allowed Drain to source Voltage Vgs = voltage treshold for opening MOSFET. When you compare two MOSFET : Ids and Vds greater = better for you Rds less = better (...)
I'm currently working on a project that requires some type of circuit and/or ic that will allow the system to automatically switch between two power supplies. One will be a solar cell and the other is a battery source. When the system detects the batteries to be low, it should switch to solar (...)
MOSFET and PWM suggests that you are going to be doing power control. I would suggest placing a buffer chip between the FPGA and the MOSFET. That way any inductive kick back or wiring error would tend to destroy the driver IC, not the FPGA. Look at the Philips family of single gate ICs. Some of these accept 3V input and a 5V power (...)
Hi All, Any idea to implement Buck step-down constant current converter for LED supply (350mA-700mA) but with also PWM for dimmering? It is suppose that there should be two frequencies involved... PWM (hundred of Hz) and Buck switch ( KHz ). Also PWM is modulating BUCK. How is the best way to achieve ? Regards, MArtin
As I remember LVDS use different impedances to have power consumptation options but did not specify either common mode or differential impedance. What me surprises is that a obvious good manual show on page 9 a possible wrong driver reference sche
Do you know some small fan like the one we use for cooling the cpu in computer graphics card? it has 3 cable instead of two. the fan has a temperature sensor in it, once it gets hot it will turn on the fan. to turn off the first motor you just have to sense if the fan is on, then turn off the motor. i hope this will help, i do not know the size of
thank u FvM. The 220 V ac input is an output of an ac voltage stabilizer, do you still think that this is an over voltage? FvM might still be right, what sort of voltage stabilizer ? There were some old designs where they used relays to switch between tabs to control the voltage. Another design uses a servo motor, you