A CD player uses two 1.5 v batteries. If you want to plug it into a 120 v outlet, what kind of transformer will you need (Step up or Step down)? What must be the ratio of the number of turns in the primary to the number of turns in the secondary?
Do nopt worry about transformer.just buy a charger for the CD player, it's much more than a transformer and is necessary and sufficient.
You will need more than just a transformer to do the job. What you need is a power supply that has other components like diodes. and capacitors, As the other answerer said, it is easiest to buy a Universal Adaptor , with an adjustable (by switch) output voltage and output polarity and they come with an assortment of connectors. If you really want to build a power supply then first consider that the peak value of the 120Vac-?мs source 120√2 ≈ 170 volts. You need 1.5 + 1.5 3 volts (if the batteries are in series) so you'll need a transformer of about 170 ? 3 56:1 (stepdown) Depending on the filtering used, and the losses, and the actual voltage level at your home outlet (I've seen ?мs values from 110 Vac to 125 Vac), a 45:1 transformer would be better. The transformer must be rated at 60 Hz.
there is not any longer something incorrect with the turns ratio; the topic is that the sq. wave has severe frequency harmonics that are no longer nicely taken care of by technique of the ferrite. extra importantly, you're turning out to be to be magnetic saturation of the ferrite. you should do a calculation, based on the meant familiar contemporary, of the magnetization of the ferrite (a wisdom sheet on the middle will help), and from which you will calculate a suitable style of familiar turns.
