Circuit regulated Linear power supply with 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 disadvantages 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 an 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.
How it works
- When we pull power switch (S1) on, the AC-line voltage will pass through a fuse F1 and come to transformer T1 to reduce AC volts down to 12 volts
- Then this current flow through the bridge diode model (D1-D4)-1N4001 to full wave rectifier as DC current and through C1 to filter current to smooth up and has C2 filter ripple signal before into LM317.
- LED to display power on the circuit, with R1(2K) currents to reduce it.
- The output voltage is determined by rotating a selector switch S2 a level voltage 1.5, 3, 4.5, 5, 6 and 9 volts respectively
- C5 (10uF) control impedance and reduce a transient at output of IC1
- C3 (10uF)- help to reduce the ripple before is amplified when the output voltage rise up.
- C4 (0.1uF) reduce the ripple at output.
- D5 and D6(1N4001) for protects IC1 from discharging of C3 and C5 respectively. In case, the input of IC1 is shorted.
- The maximum output current about 1.5A depends on size of the transformer We should choose size of 2A., Or size 1A for those who want to 1A output current only.
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Suggestion of the printed circuit board to assemble the Eliminator Batteries for 1.5, 3, 4.5, 5, 6 and 9 Volt
![Circuit Regulated Linear Power Supply With Lm317 Pcb Circuit Regulated Linear Power Supply With Lm317 Pcb](https://edzto98unzj.exactdn.com/wp-content/uploads/2013/01/Circuit-regulated-power-supplyintegrated-LM317-4-800x724.png?strip=all&lossy=1&quality=75&sharp=1&ssl=1)
![Circuit Regulated Linear Power Supply With Lm317 Pcb Component View Circuit Regulated Linear Power Supply With Lm317 Pcb Component View](https://edzto98unzj.exactdn.com/wp-content/uploads/2013/01/Circuit-regulated-power-supplyintegrated-LM317-2-800x773.png?strip=all&lossy=1&quality=75&sharp=1&ssl=1)
![Circuit Regulated Linear Power Supply With Lm317 Pcb Component Silk Circuit Regulated Linear Power Supply With Lm317 Pcb Component Silk](https://edzto98unzj.exactdn.com/wp-content/uploads/2013/01/Circuit-regulated-power-supplyintegrated-LM317-5-800x724.png?strip=all&lossy=1&quality=75&sharp=1&ssl=1)
BOM for assembling the battery eliminator circuit with Lm317 from 1.5 to 9 Volts.
Part | Value |
Resistors 1/4 Watt 5% | |
R1 | 100 — Brown, Black, Brown, Gold |
R2 | 820 — Gray, Red, Brown, Gold |
R3 | 1.8 — Brown, Gray, Gold, Gold |
R4, R10 | 18 — Brown, Gray, Black, Gold |
R5, R | 120 — Brown, Red, Brown, Gold |
R7 | 39 — Orange, White, Black, Gold |
R8 | 82 — Gray, Red, Black, Gold |
R9 | 220 — Red, Red, Brown, Gold |
Capacitors | |
C1, C3 | 100n — Ceramic Capacitor |
C2 | 2200µF/25V a 4700µF/25V — Electrolytic Capacitor |
C4, C5 | 10µF/25V — Electrolytic Capacitor |
Semiconductors | |
D1, D2, D3, D4, D5, D6 | 1N4004 or equivalent – Rectifier Diode |
IC1 | LM317T — Adjustable Voltage Regulator |
LED | Red Led 5 mm |
Miscellaneous | |
REG | Voltage-regulated output connector. |
AC | Connector for the transformer |
S | 1×6 Switch |
Solder, Wires, PCB, box, 12V/1.5A transformer, connectors, etc. |
Download PDF files for this assembly – Copper side PCB, Component side, Silk, Pads, Schematic, LM317 Datasheet
Gerber added
- Download datasheet em PDF do CI LM317 — ON semi
- Download datasheet em PDF do CI LM317 — TI
- Download datasheet em PDF do CI LM317 Lm217 — ST
- Download datasheet em PDF do CI LM317 LM317A Lm217A — Analog
- Download datasheet em PDF do CI LM317 — Unisonic
Make a battery level indicator pcb with lm3914
Hello Ayinde
Thanks for the suggestion, noted here, for future project
a saída de 9v é ok, mas a tensão de saída outra mostrando 8.7v ..
plz reply in English
thank you
my 9v is ok but other voltages are showing 8.7v
Se ve muy bueno lo voy a elaborar para la mesa de taller
gracias por tomarse su tiempo para falicitarnos parte del trabajo de diseño exitos.