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"LPU" is the project-name for a simple HPSDR power supply. Although power supplies are widely available, the LPU will provide a convenient low-noise solution until the more complex Demeter power supply is completed. The LPU (as well as Demeter) are specifically designed for the HPSDR project.

The LPU will not take the place of Demeter; it is intended as an interim solution to power HPSDR boards until Demeter is completed.

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

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.

NOTE: 3.3VDC is only available by installing optional components not included in the kit. TAPR is not stocking these optional parts. You will need to purchase them from your favorite supplier. HPSDR modules currently available do not require 3.3VDC.

Top View

(Without optional parts installed)

Bottom View

(With optional 3.3 volt parts installed)


Ordering Information

The price for the LPU is:

  • $ 21 USD

(Place Web Order)

A note regarding email addresses: When checking out please use an email address other than @earthlink.net, @hotmail.com, @live.com, @msn.com, @outlook.com. For some reason these domains reject email from tapr.org

Shipping and Handling

Shipping and Handling within the US will be by USPS Priority Mail.

International shipping costs are calculated as closely as possible. If the actual cost exceeds the estimate by more than $10.00, TAPR will contact you to get approval for the additional funds. TAPR uses insured Priority Mail International, unless the purchaser requires something else.

Other HPSDR kits

Alex Bandpass filters ... Read more.
Atlas Backplane ... Read more.
Excalibur Reference Oscillator ... Read more.
Janus Audio Converter ... Read more.
Magister USB Interface ... Read more.
Mercury RX Module ... Read more.
Metis Ethernet Interface ... Read more.
Pandora Enclosure ... Read more.
PennyLane TX Module ... Read more.
PennyWhistle PA ... Read more.
Pinocchio Extender Board ... Read more.

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