Circuit Regulated Linear Power Supply LM317
Normally begin to learn about electronics power supply from the battery, for example, 9 volts, 1.5 volts, 6 volts etc. But there are disadvantage that when using battery power is discharged. I need to buy a new one. Consume more.
We should the dc power supply have a choice of AC voltage. Which it must provide a output voltage as usage often is 1.5volt, 3 volts, 4.5 volts, 6v, 9v, and the current is about 1 A.
When we view many circuit ideas, found that the as figure this below (number second the power supply projects in my life) have the best fit. We use a dc voltage regulator number LM317T is the heart of the circuit. Featured, is the constant voltage. Low noise. Almost equal to the voltage of the battery. And short-circuit protection as well.
List Component
R1 100 – Brown, Black, Yellow, Gold
R2 820 -Grey, Red, Brown, Gold
R3 1.8 – Brown, Grey, Gold, Gold
R4, R10 18 – Brown, Grey, Black, Gold
R5, R 120 – Brown, Red, Brown, Gold
R7 39 – Orange, White, Black, Gold
R8 82 – Grey, Red, Black, Gold
R9 220 – Red, Red, Brown, Go
C1, C3 100n – Ceramic capacitor
C2 2200µF/25V ~ 4700µF/25V – Electrolytic Capacitor
C4, C5 10µF/25V – Electrolytic Capacitor
D1, D2, D3, D4, D5, D6 1N4004
or equivalent – Rectifier Diode
IC1 LM317T – Adjustable Voltage Regulator
LED Led Red 5mm
REG Connector output voltage regulated
AC Connector for transformer
S switch 1X6