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.
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.
