Create a DC Power Supply
Create a DC Power Supply : 3 Steps - Instructables
I have a radio shack I am trying to power two mm computer case fans ma each. Aboslutely, provided the fans are for 12V service. Leave the secondary center tap unconnected, and put each end of the secondary to the AC input of the rectifier. Now the supply will be very ripply, with a Hz waveform which could be more than a volt. If you put a uF 35V capacitor across the plus and minus of the rectifier, you will smooth out the ripple, but increase the voltage above 12 volts. Make sure the fans can take the increased voltage.
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Before going to bridge rectifier, we need to know what actually a rectifier is and what is the need for a rectifier. Rectifiers are mainly classified into three types: Half-wave rectifier , Center tapped full-wave rectifier and Bridge rectifier. In half wave rectifier, only 1 half cycle is allowed and the remaining half cycle is blocked.
The purpose of bridge rectifier can be in many DC power up systems it can be home appliances where the dc power is required so that from the rectification AC can be converted into DC. Hence it can be considered as the major part of the power supply units. Based on the load requirements one can preferably select the particular rectifier for it. Bridge rectifiers are efficient enough and it consists of minimum ripple value.