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Linear Power Unit (LPU) - HPSDR Simple Power Supply

Project Leader: Scotty WA2DFI

"LPU" is the project-name for a simple HPSDR power supply. Although power supplies are widely available, and a more complex power supply Demeter will be specifically designed for the HPSDR project. With tin approachin release of Mercury this is the last hardware part of a basic functional HPSDR transceiver.

Further information will be presented on this page when it becomes available.

73 Scotty WA2DFI

Updated: (27th Ocotber 2008):

1 Physical

  The LPU (Linear Power Unit) is a self-contained power supply board for HPSDR. It is mounted onto a 20-pin ATX connector that mates with the connector on the Atlas board.

2 Requirements

HPSDR boards require power outlined in the following table.


3 Electrical

The LPU accepts a 12VDC regulated input and produced the following outputs:


The LPU does not produce -5V or any standby voltages. It ignores the ATX power-on signal and is always on. There is a jumper to shut off the -12V switching regulator when it is not needed in order to eliminate RF noise.

4 LPU Feature List

Input power: 12.5V – 14.5V regulated DC input

Outputs: +12V@2A, +5V@2A, +3.3V@2A (opt), -12V@100mA

Poly fuse on each regulator input: +12, +5, +3.3V (opt), -12V regulators

Plugs into Atlas backplane ATX connector

Mounting holes allow direct mounting to Atlas backplane

Strap disable for -12V to reduce noise

Dual power-pole input connector

Internal dual power-pole output connector for PA or accessories

Estimated PCB size: (LxWxH): 119mm X 44mm X 40mm

Estimated overall size: (LxWxH): 137mm X 54mmX 60mm