Summary of DUAL +5 V/-5V @ 200 MA REGULATED LINEAR POWER SUPPLY
This project is a dual AC-to-DC linear power supply delivering low-ripple, low-noise regulated outputs of +5V and -5V (around 200 mA) plus unregulated +/-9V DC. It uses a center-tapped step-down transformer, bridge rectifier, filter capacitors, and positive and negative linear regulators with status LEDs. Designed for sensitive analog, audio, radio, and op-amp applications, it supports 115V/230V AC selection via jumpers and provides outputs through a male header and screw terminal.
Parts used in the Dual +5V/-5V Regulated Linear Power Supply:
- CN1 AC input
- Jumper J2 for 230V AC input
- Jumpers J1 and J3 for 115V AC input
- Transformer T1 step-down 6.3V-0V-6.3V AC
- Bridge Rectifier BR1
- Capacitors C2 and C4 DC filter capacitors
- CN2 unregulated DC output (approx. +/-9V DC)
- U1 +5V regulator
- U2 -5V regulator
- D1 +5V power LED
- D2 -5V power LED
- R1 and R2 current limiting resistors for LEDs
- Capacitors C1, C3, C5, C6 output DC capacitors
- CN3 male header for +/-5V regulated output
- CN4 screw terminal for +/-5V regulated output
The project presented here is a dual AC to DC output linear power supply. This power supply provides low ripple low noise DC regulated output. Usually, transformer-based linear power supplies are considered very bulky and inefficient, but this power supply still is very important for sensitive applications such as analog circuits, communications devices, radio devices, audio circuits, OPAMP-based projects etc.
CN1 is AC input, Jumper J2 for 230V AC input, Jumper J1/J3 for 115V AC, Transformer T1-Step down transformer provides 6.3V-0V-6.3V AC Outputs, Bridge Rectifier BR1 converts AC into DC, Capacitor C2/C4 DC filter capacitors, CN2 unregulated DC output approx. +/-9V DC, U1 +5V regulator, U2 -5V regulator, D1 +5 power LED, D2 -5V power LED, R1/R2 current limiting resistors for LEDs, C1/C3/C5/C6 output DC capacitors, CN3 Male header +/-5V regulated output, CN4 screw terminal +/-5V regulated output.
PARTS EXPLANATION
- CN1 is AC input
- Jumper J2 for 230V AC input
- Jumper J1/J3 for 115V AC
- Transformer T1-Step down transformer provides 6.3V-0V-6.3V AC Outputs
- Bridge Rectifier BR1 converts AC into DC
- Capacitor C2/C4 DC filter capacitors
- CN2 unregulated DC output approx. +/-9V DC
- U1 +5V regulator
- U2 -5V regulator
- D1 +5 power LED
- D2 -5V power LED
- R1/R2 current limiting resistors for LEDs
- C1/C3/C5/C6 output DC capacitors
- CN3 Male header +/-5V regulated output
- CN4 screw terminal +/-5V regulated output
Read more: DUAL +5 V/-5V @ 200 MA REGULATED LINEAR POWER SUPPLY
- What AC voltages does this power supply support?
The supply supports 115V and 230V AC input selection using jumpers J1/J3 for 115V and J2 for 230V. - What transformer outputs are used in the design?
The transformer T1 provides 6.3V-0V-6.3V AC outputs. - How is AC converted to DC in this project?
AC is converted to DC using bridge rectifier BR1 followed by DC filter capacitors C2 and C4. - What regulated outputs does the supply provide?
The supply provides regulated +5V and -5V outputs via regulators U1 and U2. - Is there an unregulated output available?
Yes, CN2 provides an unregulated DC output of approximately +/-9V DC. - How are the regulated outputs provided to the user?
Regulated +/-5V outputs are available on CN3 (male header) and CN4 (screw terminal). - How are the regulator power statuses indicated?
Power LEDs D1 and D2 indicate +5V and -5V presence, with R1 and R2 as current-limiting resistors. - What components smooth the regulator outputs?
Output DC capacitors C1, C3, C5, and C6 smooth the regulator outputs.
