I have made a couple of designs which are suited for DIY, build by yourself. The goal has been to make a very high performing design with "normal" parts. Every printed circuit board are made by highest industrial standards. From what I know every single person which have bought from me has also succeeded. I think it is amazing when you look at the complexity of some designs. Most people have had no problems what so ever and the very few that have I have helped them to get the board working.

All of my designs are made with care. I have put a lot of work into the boards in order to create a reproducible product. If 1000 units are built, everyone of them should behave the same and the performance should be more or less identical.

Headphone Amplifiers

QRV01 A massive class A headphone amplifier design. Lot's of tweak potential.

QRV02 A multiple feedback headphone amplifier which can be altered to fit anyone. It was called in the beginning CMOY deluxe.

QRV03 A patented current feedback headphone amplifier design. Used with permission. Mr Mark Alexander designed it long time ago.

QRV04 A surface mounted class A biased headphone amplifier design. Main parts OPA627/OPA134/AD8610 plus BUF634.

QRV05 A surface mounted diamond buffer with extremely high performance.

QRV06 A surface mounted current feedback headphone amplifier design. Uses the QRV05 output buffer.

QRV07 A surface mounted current feedback headphone amplifier design. Main parts are ultra low distortion AD8610 and ultra high speed, ultra low distortion TPA6120.

QRV08 A surface mounted current feedback headphone amplifier design (QRV06) which has super regulators and transformers. May be a headphone amp with the most advanced power supply units in the world right now.

QRV09 A surface mounted current feedback headphone amplifier design. Main parts are ultra low distortion AD8610 and ultra high speed, ultra low distortion TPA6120. QRV09 replaces the QRV07

 

High End SMD to DIL Adapters

ADP01 Single opamp SO08 to Single opamp DIL08

ADP02 Dual opamp SO08 to Dual opamp DIL08

ADP03 Two Single opamps SO08 to Dual opamp DIL08

ADP04 A single SO16 opamp to single opamp DIL08

ADP05 A panel of three different kinds of adapters

 

Mains Circuits

DCT01 A circuit for eliminating DC on the mains which can cause loud hum from a toroidal transformer. DCT01 is replaced by DCT02.

DCT02 A circuit for eliminating DC on the mains which can cause loud hum from a toroidal transformer.

DCT03 A circuit for eliminating DC on the mains which can cause loud hum from a toroidal transformer, heavy duty version.

SST01 A circuit for eliminating high inrush current (and by that blowing the fuses in wall) when using a toroidal transformer.

SST02 A circuit for eliminating high inrush current but is replaced by SST03.

SST03 A circuit for eliminating high inrush current (and by that blowing the fuses in wall) when using a toroidal transformer. SST03 is the deluxe version of the SST01.

MLD01 A circuit for powering low voltage circuits directly on the mains without any transformer nor a power consuming resistor. No pcb's are available.

 

Power Amplifiers

QRP01 or Gainclone A super universal version of the famous Gainclone. It can be configured in alomst any way like inverting, non-inverting, with or without input buffer which also can configured as inverting or non-inverting.

QRP02 or Gainclone A surface mounted version of the famous Gainclone.

PA03 The Czech Gainclone - based on LM4780. Design by Pavel Dudek.

 

Rectifier Bridges

RFB01 A rectifier bridge which uses discrete diodes which can be of just any type but preferable igh speed types. Obsolete, files just for reference.

RFB02 A developed version of RFB01. A rectifier bridge which uses discrete diodes of two basic types, TO247/TO218 double diodes or TO220 single diodes. Any type can be used but preferable high speed types.

RFB03 A developed version of RFB02 using a 4-layer pcb with gold pads.

 

Regulated Power Supplies

QSXPS Rev.0 Regulator with hole mounted parts, a dual power supply version, only to add low voltage AC. Obsolete, files here only for reference. See SSR03 instead.

QSXPS Rev.1 Regulator with hole mounted parts, a dual power supply version, only to add low voltage AC. A developed version with options for more current, external cooling and different caps. Obsolete, files here only for reference. See SSR03 instead.

SPS02 High performance general purpose regulated dual power supply, configurable for plus and minus output voltage or two positive voltages.

 

RIAA Phono (Vinyl) Amplifiers

QSXM2 Rev.0 A totally discrete built ultra high performance phono amplifier with lot's of tweak potential. This is a masterpiece.

QSXM3 Rev.0 An implementation of the Analog Devices (former Linear Technology) ultra high performance phono amplifier with lot's of tweak potential. The design is based on the opamp LT1115 or LT1028.

 

Sjöström Power Supply

SPS01 An ultra high performance power supply board with double discrete rectifier bridges built on a 2-layer board, gold pads.

SPS02 High performance general purpose regulated dual power supply, configurable for plus and minus output voltage or two positive voltages.

 

Sjöström Super Buffers

SSB01 An ultra high performance diamond buffer with a 4-layer board, gold pads and with surface mounted parts on both sides.

SSB02 An ultra high performance diamond buffer with a LED bias network, 2-layer board, gold pads and with surface mounted parts on one side.

 

Sjöström Super Regulators

SSR01 Ultra high performance regulator with hole mounted parts, positive version. The pcb has four layers and gold pads.

SSR02 Ultra high performance regulator with hole mounted parts, NEGATIVE version. The pcb has four layers and gold pads

SSR03 Ultra high performance regulated dual power supply with hole mounted parts. The pcb has two layers and gold pads

SSR04 Ultra high performance reuglated dual power supply with hole mounted parts and with a transformer. The pcb has two layers and gold pads

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JSR01 Regulator with surface mounted parts, both positive and negative version in the same pcb. Obsolete, here only for reference.

JSR02 Regulator with surface mounted parts, both positive and negative version in the same pcb but without the preregulator. Obsolete, here only for reference.

JSR03 Regulator with hole mounted parts, positive version. Obsolete, files here only for reference. See SSR01 instead.

JSR04 Regulator with hole mounted parts, a dual power supply version, only to add low voltage AC. Obsolete, files here only for reference. See SSR03 instead.

JSR05 Regulator with hole mounted parts, negative version. Obsolete, files here only for reference. See SSR02 instead.

JSR06 Regulator with hole mounted parts, a dual power supply version complete with a transformer, only to add mains voltage. Obsolete, files here only for reference. See SSR04 instead. 

Unbalanced to Balanced Converter - Audio Balanced Driver

UBC01 An ultra high performance unbalanced to balanced converter built on a 2-layer board, gold pads and room for a holemounted DRV134 or a surface mounted DRV135.