@▷ My first Variable DC Power Supply 1.2V to 30V 1A by LM317 | Diagram for Schematic

My first Variable DC Power Supply 1.2V to 30V 1A by LM317

If you are beginner in electronics and you want to have a great power supply. This project is design for you. It can supply voltage 1.2V to 30V at all range is 1A.

This is the First DC power supply in my life that made to use in many projects. It is ideal for those who want to adjust voltage from 1.25V to 30V and currents up to 1A. Which is sufficient for normal use Such as is power supply instead of an one 1.5V AA battery or when you want to listen to music from a 30-watt amplifier that required voltage of 24V 1A, it can be done easily.

In the days before that we commonly used the transistor that is very difficult, large, and probably more expensive ICs. But this circuit can be created with a single IC is LM317 The LM317 or LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range,
And has many special features that I like are :
• Output Voltage Tolerance 1%
• Line Regulation 0.01%
• Load Regulation 0.3%
• Prevent the deposition temperature.
• Short-circuit protection.
• Ripple is eliminated with ratio of 80dB
• Maximum input voltage 40V

The working of circuits
Followed circuits below, the transformer T1 is changed a AC 220V down as AC 24V to the bridge diode rectifier D1(1N4001) to D4(1N4001) there is dc voltage into the filter capacitor C1 equal to DC35V
The output voltage from IC1 Depending on the Voltage Adj pin of the IC. Or to adjust the VR1.
The VR1 is control output dc voltage 0V(1.25V) to 30V(32V) or 37V maximum voltage at 1.5A max all range.

And we can calculate output voltage equal to:
= 1.25+ 1.25 VR1/R1
Then the capacitor C3 is Better performance filter of IC1.
The diode D5 and D6 ( both is 1N4007) is the protector from external voltage to reverse to makes the damage to the IC1.

Detail parts
IC1_____LM317T
D1-D4___1N4001 Diode 50V 1A
D2-D3___1N4007 Diode 1000V 1A
R1_____220 ohm Resistor 1/4W
R2_____12K Resistor 1/4W
VR1____10K__Potentiometer
C1_____1,000uF 35V___Electrolytic Capacitor
C2_____0.1uF 63V_____Polyester Capacitor
C3_____470uF 35V___Electrolytic Capacitor
C4_____10uF 35V___Electrolytic Capacitor
T1____Transformer secondary coil 24V 1A


The PCB of this projects and layout diagram.

The creation
I soldered components on the PCB as shown figure correctly completed. and The LM317 should be installed on the heat sink that fits. And a the terminals device. Be careful with the terminals, especially Electrolytic Capacitor.

Adjustment power supply values 1.25-15V Max current 0.5 amp

This is power supply that have Voltage output fine the value has 1.25-15V. From by Output current that be valuable about 0.5 amp that 12V and 0.2 amp that 15V.
When Volt , from 220V houses reach transformer. It will modify Volt 220V to be 18VAC already to change rectifier circuit. Which D1, D2, C1 and R1 wasp be Full wave rectifier circuit. For modify DCV to ACV to a signal DCV. It make get a signal DCV that have voltage at pin 3 of IC1 be 20V. From that time DCV signal this reach fight DC Regulator circuit. Which use IC number LM317. This circuit will perform to maintain one’s position Voltage smoothly. Which level output voltage at get this will go out the way pin 2 of IC1. By have capacitors C2 be voltage filter in order that voltage output level of the circuit is will high class modify to follow fining. The performing fee withstands VR1 there.

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