77 Threads found on edaboard.com: 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. (...)
Analog Circuit Design :: 03.01.2006 09:01 :: fala :: Replies: 1 :: Views: 566
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.
Analog Circuit Design :: 13.10.2010 06:35 :: vamanan :: Replies: 2 :: Views: 513
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?
Analog Circuit Design :: 20.12.2010 03:10 :: Luckybuilding :: Replies: 4 :: Views: 728
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
Analog Circuit Design :: 04.07.2012 18:28 :: RCinFLA :: Replies: 10 :: Views: 1918
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
RF, Microwave, Antennas and Optics :: 04.12.2004 19:27 :: flatulent :: Replies: 2 :: Views: 1103
If you can follow this crude sketch, you can reverse direction on your DC motor simply by reversing the polarity of the power source. two switches are all it takes, one to turn the motor on (S-1/SPST) and the other to control the direction (S2/DPDT).
HTH -- Mike
Hobby Circuits and Small Projects Problems :: 02.04.2006 22:35 :: MikeOhio :: Replies: 5 :: Views: 3026
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 (...)
Analog Circuit Design :: 14.06.2006 05:35 :: IanP :: Replies: 2 :: Views: 1022
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 ..
Electronic Elementary Questions :: 07.09.2006 22:07 :: IanP :: Replies: 2 :: Views: 1574
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 (...)
Analog Circuit Design :: 07.06.2007 02:32 :: OradFarez :: Replies: 5 :: Views: 1808
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 (...)
Electronic Elementary Questions :: 02.09.2007 22:39 :: Eliask08 :: Replies: 1 :: Views: 1016
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.
Analog Circuit Design :: 07.02.2008 09:49 :: lladnar23 :: Replies: 2 :: Views: 602
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.
Electronic Elementary Questions :: 29.04.2008 21:44 :: bittware :: Replies: 4 :: Views: 1004
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.
Analog Circuit Design :: 05.06.2008 18:04 :: FvM :: Replies: 13 :: Views: 917
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 (...)
Analog Circuit Design :: 15.09.2008 15:28 :: ktec1 :: Replies: 12 :: Views: 9459
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 (...)
RF, Microwave, Antennas and Optics :: 04.10.2008 10:25 :: biff44 :: Replies: 6 :: Views: 1491
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 (...)
Miscellaneous Engineering :: 20.11.2008 21:55 :: ryan.sager1 :: Replies: 0 :: Views: 741
(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 (...)
Electronic Elementary Questions :: 13.11.2009 19:01 :: rogierland :: Replies: 2 :: Views: 948
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.
All construction takes 3 days. Costs – zero, all elements
Show DIY :: 16.03.2010 07:13 :: gres :: Replies: 1 :: Views: 2039
Simply use LTC4412 controller to switch between main load and battery using one or two mosfet.
All the best
Power Electronics :: 24.04.2010 07:00 :: bobcat1 :: Replies: 4 :: Views: 905
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.
Power Electronics :: 06.07.2010 01:39 :: eXnol :: Replies: 3 :: Views: 560
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
Analog Circuit Design :: 26.01.2011 00:46 :: billbaty :: Replies: 5 :: Views: 400
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
Power Electronics :: 27.01.2011 21:46 :: IanP :: Replies: 2 :: Views: 1251
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
Power Electronics :: 20.03.2011 10:00 :: desmond1310 :: Replies: 9 :: Views: 875
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
Professional Hardware and Electronics Design :: 12.05.2011 14:33 :: jiripolivka :: Replies: 2 :: Views: 1106
source: Konsola o
Project by motykami
I handle small disco parties (100-200 persons).
Regular unwinding extender cables separately to every light point
Show DIY :: 31.08.2011 15:48 :: BlackMamba :: Replies: 0 :: Views: 232
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 (...)
RF, Microwave, Antennas and Optics :: 30.09.2011 06:30 :: FvM :: Replies: 7 :: Views: 385
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 (...)
Professional Hardware and Electronics Design :: 01.11.2011 15:14 :: arr_baobao :: Replies: 7 :: Views: 1680
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
Analog IC Design and Layout :: 01.05.2012 08:13 :: barry :: Replies: 4 :: Views: 339
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.
Analog Circuit Design :: 10.05.2012 23:31 :: KerimF :: Replies: 12 :: Views: 733
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.
Analog Circuit Design :: 20.06.2012 08:19 :: FvM :: Replies: 33 :: Views: 2427
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 (...)
Analog Circuit Design :: 25.02.2013 14:07 :: nadeenman :: Replies: 3 :: Views: 305
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
RF, Microwave, Antennas and Optics :: 28.04.2013 18:26 :: SunnySkyguy :: Replies: 2 :: Views: 224
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?
Analog Circuit Design :: 10.05.2013 06:56 :: MILIND42 :: Replies: 11 :: Views: 1251
The simplest solution will be to build an OR-switch using two diodes, as shown on the attached picture ...
Power Electronics :: 22.05.2013 00:24 :: IanP :: Replies: 4 :: Views: 595
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
Hobby Circuits and Small Projects Problems :: 01.07.2013 11:13 :: ALERTLINKS :: Replies: 19 :: Views: 745
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 (...)
Electronic Elementary Questions :: 08.08.2013 09:14 :: energised :: Replies: 1 :: Views: 199
For a current project of mine, I have to switch between two voltage sources (wall power supply or battery pack). When an external power source is present it should be used to power the device (with higher than the battery priority). There can be one case, where (...)
Hobby Circuits and Small Projects Problems :: 21.08.2013 13:13 :: osvaldor :: Replies: 0 :: Views: 13
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 (...)
Professional Hardware and Electronics Design :: 29.07.2002 21:12 :: RegUser_2 :: Replies: 5 :: Views: 1590
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!
Professional Hardware and Electronics Design :: 13.01.2003 08:50 :: Sebi :: Replies: 10 :: Views: 4997
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 (...)
Professional Hardware and Electronics Design :: 22.04.2003 06:29 :: goodboy_pl :: Replies: 2 :: Views: 905
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 (...)
Hobby Circuits and Small Projects Problems :: 08.04.2004 19:42 :: eltonjohn :: Replies: 5 :: Views: 3804
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
RF, Microwave, Antennas and Optics :: 01.11.2004 17:50 :: SFactor :: Replies: 3 :: Views: 1252
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 (...)
Hobby Circuits and Small Projects Problems :: 25.11.2005 18:46 :: david90 :: Replies: 7 :: Views: 1037
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 (...)
Professional Hardware and Electronics Design :: 16.01.2006 13:26 :: vvvvvv :: Replies: 6 :: Views: 1951
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 (...)
Electronic Elementary Questions :: 27.02.2006 02:10 :: atc9443 :: Replies: 2 :: Views: 823
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 (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 18.03.2007 21:56 :: banjo :: Replies: 7 :: Views: 1560
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 ?
Hobby Circuits and Small Projects Problems :: 02.08.2007 23:57 :: martingn :: Replies: 18 :: Views: 18197
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
RF, Microwave, Antennas and Optics :: 06.02.2008 06:52 :: rfsystem :: Replies: 10 :: Views: 3795
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
Hobby Circuits and Small Projects Problems :: 16.10.2007 04:43 :: cemara :: Replies: 5 :: Views: 1484
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
Service Manuals, Requests, Repair Tips :: 12.02.2008 13:48 :: ossama22 :: Replies: 6 :: Views: 21681