Printed Circuit Boards for RJM Audio Projects

Download layout and schematic files. Order boards and parts.


Phono Stages : Line and Headphone : Voltage Regulation


This is the place for ordering kits, boards, and parts for various projects featured on my web site. Please send me an email (Richard Murdey, rjm003.geo@yahoo.com) listing what you want, and I will send you a Paypal invoice for the total. Kits include the boards, instructions, and all the parts to complete the boards. Generally, you need to supply a transformer and diodes, as well as the chassis, connectors, wiring, volume control, etc. I only accept Paypal payments. Prices are in US dollars and listed below. Shipping is free.

The parts lists and worksheets for each project are available as a spreadsheet file (Excel .xlsx) which you can download below. They normally have a pre-formatted BOM (Bill Of Materials a.k.a. a parts list) you can import directly into your shopping cart at Mouser. The spreadsheet files also has worksheets and other useful information.

You will need to download and install the free Eagle Layout Editor software to view the schematic and board layouts. You can use the .brd files to make your own boards if you want. Just two rules: don't pass them off as your own work, and don't use them for commercial gain.

I've written a construction guide for the phono stage projects, with details of the power supply and connections.

Problems? Questions? Email (address above) or check out the VSPS and Phonoclone Help Desk or search the related forums at diyaudio.com. As well as being a valuable general resource, there are many threads there concerning the projects featured below. I also have a blog diyaudio, and maintain a Google+ page.


Phono Stages


Stereo VSPS

The Stereo VSPS

VSPS Standard

The original stereo VSPS is a dual-layer 5 cm x 8 cm board, and takes a dual op-amp of your choice. This is a dual-channel layout, only one board is needed for stereo. LM7x12 regulation on board. Board only $10 / Kit $40

Download Schematic (BOM) / RJM Audio VSPS Project Page


VSPS 300 Dual-Mono MM Phono Stage with X-Reg

VSPS 300

The VSPS 300 is a dual-layer 10 cm x 8 cm board. This is the "high-end" version of the VSPS. It is a single channel board (two complete boards required for stereo) and features the X-reg voltage stabilizer circuit included on the boards. It requires three single op amps of your choice. It is the same size as the Phonoclone 3 boards, below, and has the same mounting holes, to allow upgrading or swapping boards. Boards only (set of 2) $25 / Kit $150.

Download Schematic (BOM) / RJM Audio VSPS Project Page


CrystalFET Dual-Mono MM MC Jfet Passive Phono Stage with MOSFET Shunt-Series Regulator

CrystalFET

The CrystalFET is a dual-layer 10 cm x 8 cm board. It is a single channel board (two complete boards required for stereo) and features the a MOSFET shunt-series voltage regulator. Sorry, the mounting holes are not compatible with VSPS and Phonoclone boards. Boards only (set of 2) $25 / Kit $150.

Download Schematic (BOM) / RJM Audio CrystalFET Project Page


Phonoclone 3 Dual-Mono MC Phono Stage with X-Reg

Phonoclone 3

The Phonoclone 3 is dual-layer 10 cm x 8 cm board and a drop in replacement for the earlier BE board. It is a single channel board, two complete boards are required for stereo. The X-reg voltage stabilizer circuit is built in to the boards, no additional regulation or filtering required. Boards only (set of 2) $25 / Kit $150.

Download Schematic (BOM) / RJM Audio Phonoclone Project Page


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Line and Headphone


Sapphire Rev. 3.0f

Sapphire 3 Headphone Amplifier

Sapphire

The Sapphire 3 boards are dual-layer and measure 10 cm x 8 cm. Dual mono layout, two complete boards are required for stereo. Z-Reg voltage regulation circuit is built in. Requires one single op amp per channel, also accepts 2520 modules - FET input types recommended. Boards only (set of 2) $25 / Kit $150.

Download Schematic (BOM) / RJM Audio Sapphire 3 Project Page


Sapphire 4 Headphone Amplifier

Sapphire

The Sapphire 4 boards feature the fully descrete Unity H amplifier circuit with Z-Reg voltage regulation circuit built-in. Dual mono layout, two complete boards are required for stereo. Boards only (set of 2) $25 / Kit $150. [prototype phase]

Download Schematic (BOM) / RJM Audio Sapphire 4 Project Page


Unity (H) Dual-Config Line / Headphone Amplifier

RJM Audio Unity (H)

The Unity and Unity H are discrete transistor preamplifier and headphone amplifier circuits, respectively, that share a common board. Dual-layer, 10 cm x 8 cm. Dual mono layout, two complete boards are required for stereo. No voltage regulation, use S-Reg for Unity, Z-Reg recommended for Unity H. Boards only (set of 2) $25 / Kit $150. [prototype phase]

Download Schematic (BOM) / RJM Audio Sapphire Project Page


J-Mo Mk. II JFET-MOSFET Headphone Amplifier with M-Reg MOSFET Regulator

JMo2 JMo2

The J-mo Mk. II amplifier and matching M-Reg voltage regulator boards are dual-layer and measure 8 cm x 5 cm. Dual mono layout, two complete boards are required for stereo. The amplifier can be powered from any 15-18 V 1 A regulated power supply instead of the M-Reg. J-Mo Mk. II Boards (set of 2) $15 / Kit $50. M-Reg boards have been discontinued.

Download Schematic (BOM) / RJM Audio J-Mo Mk. II Project Page


B-Board Diamond Line and Headphone Buffer

B-Board

The B-Board circuit boards are dual-layer and measure 10 cm x 4 cm. Dual mono layout, two complete boards are required for stereo. Z-Reg voltage regulator circuit included on board. Will drive most headphones. Boards only (set of 2) $15 / Kit $75.

Download Schematic (BOM) / RJM Audio B-board Project Page


B-Board 2 Line Buffer

B-Board

The B-Board II circuit boards are dual-layer and measure 5 cm x 8 cm. Dual mono layout, two complete boards are required for stereo. The high performance buffer has improved PSRR and distortion characteristics over the original B-Board. Voltage regulation circuitry is not included, however. The S-Reg board, below, is the recommended pairing. Boards only (set of 2) $15 / Kit $75.

Download Schematic (BOM) / RJM Audio B-board 2 Project Page


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Voltage Regulation


Z-Reg Voltage Regulator

RJM Audio Z-Reg

The Z-Reg voltage regulator is a double-sided board and measures 8x5 cm. This is the same power circuit used in the Sapphire and oroginal B-board projects, now offered as a standalone board. Board only $10 / Kit ---.

Download Schematic (BOM) / RJM Audio Z-reg Project Page


S-Reg Voltage Regulator

RJM Audio S-Reg

The S-Reg voltage regulator is a double-sided board and measures 8x5 cm. Low noise shunt-series regulator for low current applications. Board only $10 / Kit ---.

Download Schematic (BOM) / RJM Audio S-reg Project Page


X-Reg Voltage Stabilizer

X-reg Evaluation RJM Audio X-Reg

The X-reg voltage stabilizer board is double-sided board and measures 5x8 cm. It requires a dual op amp such as the NE5532. There are two layouts offered, the old "demo" boards (Rev 1.5c) while quantities last, and the new boards which are drop-in replacements for the S-Reg and Z-Reg boards. They are functionally identical except for the connection header. The board can be used for testing, or retrofitted to upgrade existing equipment. Board only $10 / Kit ---.

Download Schematic (BOM) / RJM Audio X-reg Project Page


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