Regulated Power Supply Circuit

Today i'll give you a circuit diagram for regulated power supply which will give regulated DC output
In this circuit we uses a LM317 and LM337 as regulators,LM317 is for regulating a +ive voltage and LM317 is for regulating -ive voltage, in the start of circuit there is a bridge rectifier for converting AC to DC and capacitors to remove ripples.

Here are the components that are used in this circuit:-

Capacitors:
C1, C2 (2200 uF 50V)
C3, C4, C5, C7 (2.2 uF 50V)
C6, C8 (100 uF 50V)

Resistors:
R1, R4 (5K Potentiometer)
R2, R3 (220 Ohms 1/4 W Resistor)

Active Components:
D1 to D4 IN 4007 Diodes
U1 LM317 U2 LM337

T1 (24-0-24 Center Tapped 2 Ampere Transformer)
S1 ( Switch)


If you have any query regarding this circuit comment below.
Best of Luck Engineers :D

Light Dark Sensor

This is a light dark sensor, it uses BJT (bipolar junction transistor), LDR (Light dependent resistor), LED (Light emitting diode), and a resistor for biasing BJT, it uses 6V but you can use 9V too because i used a 9V battery.
care should be taken in determining base,emitter and collector for BJT.

In its working, at night resistance of LDR increases and BJT starts conducting but during day its resistance is almost negligible and BJT is in non-conducting state.