The iron core, again,įacilitates that process. Which means that the voltage is less coming out of this part. Because this coil has fewer turns, it's a step-down transformer The way it does it is this coil induces a current flow in this coil, and the iron core helps that to happen. Because the components in the alarm clock need lower voltage. What this transformer does is it converts 120 volt AC down to nine volt AC. Wound around fewer times in this particular transformer. The primary coil is wound aroundĪ certain number of times. We've got a primary coil, a secondary coil, and an iron core. In the transformer, thereĪre three key components. The first thing is let's takeĪ look at the power system. And the structure of the device in the interface. Take apart an alarm clock radio and we're gonna see what's By the time the capacitor is completely discharged, the bridge rectifier is outputting more than 4.5 volts again, and is ready to power the device plus recharge the capacitor. When the bridge rectifier is outputting 0 volts, the capacitor is outputting the maximum voltage, 4.5 volts, so the device always sees a (relatively) constant voltage, of 4.5 volts. Whenever the bridge rectifier is outputting less than 4.5 volts (again, half the time), the capacitor stops charging and starts discharging- providing that extra power that the bridge rectifier is no longer powering directly. In that case, whenever the bridge rectifier is putting out greater than 4.5 volts (which it is doing half the time), we use the extra to charge the capacitor. Imagine we only use half of our 9 volts, or 4.5 volts, to run the device. Think of a capacitor like a little tiny battery that can be charged and discharged very quickly. So what we are going to do is use a capacitor. But what we would like is a constant flow of power. In this case the maximum is 9 volts (since the transformer stepped the voltage down to 9). So now we have a power source that goes from 0 to some maximum positive amount and back to 0, over and over again. That isn't exactly the way it works, but a good analogy. Then, they are wired back together in such a way that all of the current is flowing in the same direction on the other side- think of that as basically taking the 2 negative-passing diodes and wiring the output backwards from the positive passing diodes so that all the outputs are now going in the same direction. 4 diodes are wired to the AC input in such a way that 2 of them only allow the positive direction through, and 2 of them only allow the negative direction through. The video explained fairly well what the diodes do- basically diodes only allow current to pass through in one direction. Press and hold until “STEP” display, change frequency by 0.1MHz stepIt's the process of from converting from AC to DC where the smoothing out happens.Press to auto search the Prev/Next station.Press to select next stored FM station.Press and hold for 3s to scan all the FM stations.Press enter FM radio mode, “FM” is display.when the playing station is a preset station, is a display.Press to select the preset station stored.Press and hold number, store the playing station as a preset station in this address number.Press and hold for 3s to search all the DAB stations.When alarm ring, press to snooze 9 minutes, or Adjust screen brightness In radio work mode, press to set auto turn off, to selectġ5/30/60/90/OFF minutes sleep. Three alarm schedules can be set: Once/weekdays/whole week.Three alarm sound sources can be selected: DAB/Buzzer/FM.Press and hold for2 seconds, the alarm timer hour begins to blink.press again to activate or deactivate the alarm timer.In standby or work mode, pressthe digits begin to blink, view the alarm settings.
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