If you want something that has some length to it so you can charge from a distance, this is the one. For all those times the mains sockets in your office or room are never enough for the electronic that need to be powered, mains adapters are an easy and convenient solution. The changed pulse width from the oscillator is sent to drive the transistor, which acts as a switch. If it were a sensitive piece of electronics necessary for national security, I would feel differently.

I once had a friend visit from the USA that was bringing her hair straighteners and purchased what I thought was the appropriate US to UK adapter but when she plugged them in, very shortly there was smoke. Due to the high operating frequencies in SMPSs, the stray inductance and capacitance of the printed circuit board traces become important.The real solution would have been for the manufacturer to provide a charger with the unit in the original packaging. Hi there, can you give me any advice as I’ve read and re-read the post but can’t work out if I should Plug this charger into my carpet sweeper or not. This is because the inductor responds to changes in current by inducing its own voltage to counter the change in current, and this voltage adds to the source voltage while the switch is open. But what I am also going to assume is that the adapter is giving the 1 amp input rating just to let me know that the AC plug power cord going from the wall into the adapter must bring in at least 1.

If I could get one style of adapter that worked on every computer appliance/device (including external hard drives) then I’d be willing to pay a mint for it, and then get multiples of the adapter for backup. The universal power supply has circuitry to adjust the voltage to the needed level and the maximum current would also change such that the product is 90W. Extremely large peak "in-rush" surge current limited only by the impedance of the input supply and any series resistance to the filter capacitors.

By switching the bipolar switch when the voltage is at a minimum (in the valley) to minimize the hard switching effect that causes EMI. I forgot to ask and it’s worth a shot since I rarely come across people like you; Would you happen to have a similarly beautiful explanation for how resistors work in series and in parallel? It first says a device will not work properly if you have a “Higher current adapter than device rating. I have a spare wall wart rated at 9V DC 1500mA that I would like to use which also doesn’t indicate polarity.

The inverter stage converts DC, whether directly from the input or from the rectifier stage described above, to AC by running it through a power oscillator, whose output transformer is very small with few windings, at a frequency of tens or hundreds of kilohertz. I have an internet switch device which originally has adapter with following specs: output 9 volts —500 miliamp.I used the reverse ac adapters for the base and handset of a uniden phone (D1788) which I didn’t realize since it worked fine for 8 months, the difference in output was 7.

If you have a device that needs 20 volts, and you feed it 100, your device will probably not survive the experience, though may entertain you with some fireworks for a few seconds. If you grab an incompatible power adapter, your best case scenario is that it works, albeit not the way the manufacturer intended. The main advantage of the switching power supply is greater efficiency ( up to 96%) and lower heat generation than linear regulators because the switching transistor dissipates little power when acting as a switch.All isolated topologies include a transformer, and thus can produce an output of higher or lower voltage than the input by adjusting the turns ratio.