Schematics > Power > Dual Polarity Power Supply
Dual Polarity Power SupplyThis 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.
Schematic
Parts
| Part |
Total Qty. |
Description |
Substitutions |
| C1, C2 |
2 |
2200uF 35V Electrolytic Capacitor |
|
| C3, C4, C5, C7 |
4 |
1uF 35V Electrolytic Capacitor |
|
| C6, C8 |
2 |
100uF 35V Electrolytic Capacitor |
|
| R1, R4 |
2 |
5K Pot |
|
| R2, R3 |
2 |
240 Ohm 1/4 W Resistor |
|
| BR1 |
1 |
2A 30V Bridge Rectifier |
|
| U1 |
1 |
LM317 Adjustable Positive Regulator |
|
| U2 |
1 |
LM337 Adjustable Negative Regulator |
|
| T1 |
1 |
30V Center Tapped 2 Amp Transformer |
|
| S1 |
1 |
SPST 2 Amp Switch |
|
| MISC |
1 |
Heatsinks For U1 And U2, Line Cord, Case, Knobs For
Pots, Wire |
|
Notes
1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it
MUST be built inside a case.
2. U1 and U2 get quite hot and will require heatsinks. A fan is usually not
needed.
3. You can, of course, add a volt and amp meter.
4. 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 for the suggestion).
Also check
this LM317 Calculator
Title: Dual Polarity Power Supply
Source: www.aaroncake.net
Published on: 2005-02-03
Reads: 376
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