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Here is a simple Fixed voltage regulator circuit using 7805 and 7905 voltage regulator ICs Components Required: 1) Breadboard 2) 1Amps Fuse 3) 9 - 0 - 9 center tapped Transformer 4) 1N4007 diode = 4 5) 2200uf capacitor = 2 6) 100nf capacitor = 2 7) LM7805 Positive Voltage Regulator IC 8) LM7905 Negative Voltage Regulator IC Explanation for Dual Voltage Regulator: Connect the circuit as shown in the circuit diagram below. The output of the center tapped transformer is AC voltage. Voltage between the center and anyone of the other terminal gives +9Volt AC, Voltage between the two outer terminals gives +18Volt AC. Connecting in center tapped pattern gives +9Volt AC across terminals 1 & 2 and gives -9Volt AC across terminals 3 & 2. Four 1N4007 diode connected as shown below forms a bridge circuit which converts bidirectional AC into unidirectional DC. The converted signal is not pure DC, it still consists of some AC signals. The 2200uf capacitor is used as a filter, which allow...

Here is a simple variable voltage regulator circuit using LM317 and LM337 ICs Components Required: 1) Breadboard 2) 1Amps Fuse 3) 15 - 0 - 15 center tapped Transformer 4) 1N4007 diode = 4 5) 2200uf capacitor = 2 6) 100nf capacitor = 2 7) 150 ohm resistor = 2 8) 3.9 kilo ohm Potentiometer (POT) = 2 9) LM317 Positive Voltage Regulator IC 10) LM337 Negative Voltage Regulator IC Explanation for Dual Voltage Regulator: Connect the circuit as shown in the circuit diagram below. The output of the center tapped transformer is AC voltage. Voltage between the center and anyone of the other terminal gives +15Volt AC, Voltage between the two outer terminals gives +30Volt AC. Connecting in center tapped pattern gives +15Volt AC across terminals 1 & 2 and gives -15Volt AC across terminals 3 & 2. Four 1N4007 diode connected as shown below forms a bridge circuit which converts bidirectional AC into unidirectional DC. The converted signal is not pure DC, it still consists of some AC signals...