similar circuits
- Stablised Power Supply With Short-Circuit Indication
- 3-30V 3A Adjustable Regulated DC Power Supply
- 9 Volt 2 Ampere DC Power Supply Circuit Diagram
- Adjustable 1.3-22V Regulated Power Supply
- Adjustable Current Limit For Dual Power Supply
- Quad Power Supply For Hybrid Amplifier
- Stabilized Regulated Power Supply Circuit
- Transformerless 5 Volt Power Supply
- Variable Dc Power Supply
- High-Voltage Regulator With Short Circuit Protection
- Ampere or Current Booster Circuit
- Smoke Alarm Battery Life Extender
- High Current Regulated Supply
- 2 Watt Switching Power Supply
- Variable Voltage and Current Power Supply
Dual Polarity Power Supply
Description
This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage.
Circuit diagram
Parts
- C1, C2 2200uF 35V Electrolytic Capacitor
- C3, C4, C5, C7 1uF 35V Electrolytic Capacitor
- C6, C8 100uF 35V Electrolytic Capacitor
- R1, R4 5K Pot
- R2, R3 240 Ohm 1/4 W Resistor
- BR1 2A 30V Bridge Rectifier
- U1 LM317 Adjustable Positive Regulator
- U2 LM337 Adjustable Negative Regulator
- T1 30V Center Tapped 2 Amp Transformer
- S1 SPST 2 Amp Switch
- MISC Heatsinks For U1 And U2, Line Cord, Case, Knobs For Pots, Wire
Notes
- Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.
- U1 and U2 get quite hot and will require heatsinks. A fan is usually not needed.
- You can, of course, add a volt and amp meter.
- U1 and U2 can only go down to a minimum of +-1.2V. If you need to go lower, you can add two 1N4003 diodes in series with the output of the regulator. The diodes drop about 0.6V each, which will allow the supply to go to 0. Note that this will also decrease your maximum output voltage by 1.2V. (Thanks to Steve Horvath, horvaths@techcomnet.com for the suggestion).
circuit from http://www.aaroncake.net/