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Insight - How Adaptor works

Written By: 

Ashok Sharma


In today’s world most of the electronic appliances needs DC voltages from 3-12 Volts for operation. An adaptor is a device which is used to convert high AC voltages to low DC voltage. Adaptors come in various shapes, sizes & configuration depending on the use. In some cases adaptors are used to provide power to electronic appliances like video games, modems etc and in some cases they are used to charge the primary battery of the electronic device and also act as alternate power source like mobile chargers, laptop chargers, cell chargers etc. A typical adaptor is shown in the figure below.
Adaptor | AC to DC Converter
The left red knob changes the output voltage while the right one is used to change the polarity of output voltage.
An adaptor works in these 3 simple steps:
1.      AC voltage is stepped down using a Transformer
2.      A rectifier circuit changes the AC signal to DC signal.
3.      A capacitor filters the signal to smooth DC waveform.
 Internal Circuitry


Circuitry of Adaptor, components of dc adaptor
On removing the outer plastic body of the adaptor, glimpse of transformer and other circuitry is shown in the image above. 


superb article

very knoledge ful and i m curiously waiting for more insight articles



Excellent wink

good explaining thanks for this effort



Sound info 

thank you for sharing


this harware gives an insight of the application of a Full Wave Rectifier and Much more apart of that !


nice one >>>>>>>>wink

hey great keep uploadin more such useful things....:)

good explanation

Just Amazing..

Very interesting... I want to learn more...

Very simple language Satisfied with your answer

How does it step down the amps?

Complete engineering but not that knowledge