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Description
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Circuits Power Supplies Fixed Voltage Power Supply
Fixed Voltage Power Supply
The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A.
Notes
1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.
2. U1 will reauire a heatsink.
3. You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.
Source: aaroncake
Notes
1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.
2. U1 will reauire a heatsink.
3. You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.
- Vout T1 U1
5V 6V, 1.5A 7805
6V 6V, 1.5A 7806
9V 12V, 1.5A 7809
12V 12V, 1.5A 7812
15V 24V, 1.5A 7815
18V 24V, 1.5A 7818
Source: aaroncake
Partlist
1 x 2200uF 35V Electrolytic Capacitor (C1)
2 x 0.1uF Ceramic Disc Capacitor (C2, C4)
1 x 10uF 35V Electrolytic Capacitor (C3)
2 x 1N4007 Silicon Diode (D1, D2)
1 x 2A 30V Bridge Rectifier (BR1)
1 x Regulator (See Notes)(U1)
1 x Transformer (See Notes) (T1)
1 x SPST 2 Amp Switch (S1)
1 x 2A 250V Fuse and Holder (F1)
MISC: Heatsink For U1, Line Cord, Case, Wire
2 x 0.1uF Ceramic Disc Capacitor (C2, C4)
1 x 10uF 35V Electrolytic Capacitor (C3)
2 x 1N4007 Silicon Diode (D1, D2)
1 x 2A 30V Bridge Rectifier (BR1)
1 x Regulator (See Notes)(U1)
1 x Transformer (See Notes) (T1)
1 x SPST 2 Amp Switch (S1)
1 x 2A 250V Fuse and Holder (F1)
MISC: Heatsink For U1, Line Cord, Case, Wire
Files
Comments
Aug 25 2007 0:43
Mike O'Higgins
hi.
You said, as well as many others, 78xx can handle 1.5 A but the datasheet ( National Semiconductor for 78xx series) stated that the max current is 1.0 A .....
does it need something else to work with current higher than 1 A ????
You said, as well as many others, 78xx can handle 1.5 A but the datasheet ( National Semiconductor for 78xx series) stated that the max current is 1.0 A .....
does it need something else to work with current higher than 1 A ????
Aug 28 2007 15:32
Jospfh
I'm not the designer of this circuit but I think the 78xx can are designed to handle 1 A. But in practice they are able to handel more (e.g. 1.5 A).
