January 26, 2016

June 24, 2015

Zen Line Stage


My DIY Nelson Pass preamplifier, made in 2001.
Sold to my friend Jens Gregersen around 2002.
Still proud of seeing those pictures in the Pass DIY Gallery.
The url to the schematic is dead and I use another e-mail now.
Here's the schematic:

June 19, 2015

Tube amplifiers and horn speakers

Current setup.
Preamplifier: Musical Fidelity X-10D clone with 6J1 tubes.
Amplifier: Modified Dynavox VR70E-2.

Speakers: Voight horns ("Gulvhorn") with Fostex FE-204 and Fountek Neo CD3.0 ribbon tweeters.
Sources: piCorePlayer and DAC, DIY turntable with Pro-Ject 8.6s tonearm and ADC XLM. VSPS riaa.

April 6, 2015

Dynavox VR70E-2, another rebuild

In 2011 I modified the Dynavox VR70E-2.
A couple of month ago I bought another VR70E-2 unit.
I've also modified and rebuilt this one. Here's how it looks:

November 3, 2014

Yaqin MC-10K rebuilt

Yaqin MC-10K repaired and rebuilt.
Electrolytes and power resistors replaced. Russian PIO caps. ALPS potentiometer. Input selector with relays.
New front with gold knobs.

Sweet sounding amp.


July 22, 2014

LM3875 amplifier boards in new enclosure

Rebuilt my 2003 LM3875 Gainclone amplifier.
Galaxy enclosure with wooden side plates. Thule buttons.
Two single secondary transformers in parallel, 18V.
Audiosector PSU boards with 2 x 10.000uF supply caps. 220uF caps on amplifier boards.
Approximately 2 x 40 watts.

Solid oak turntable

Solid oak tree plinth. Acrylic platter.
Mounted a Thorens TP-16 mk. 2 tonearm with Pickering XV-15/625E cartridge.
Sweet combination.

High resolution pictures.

April 18, 2014

VSPS RIAA in a cigar box

DIY VSPS phono stage with batttery supply.
OPA2604 op amp.


Update, January 2015.
Now with PSU in another case:

November 10, 2011

DAC for desktop

Here's a nice multi-input DAC.
I use it at my desktop for laptop (USB), Squeezebox Classic (coxial) and Argon DAB radio adapter (optical).

Based on TDA1315 and TDA1305.
Does its job good.
More pictures here.

September 27, 2011

Another linear PSU for Squeezebox

Here's one more 5V power supply for Squeezebox Touch.
Very simple circuit based on LM350 regulator (3A). Built on AudioSector generic PSU board.
50VA 2x12V transformer, MUR420 rectifier diodes. NOS Wicon 1000uf at the output. Bypass caps are MKT1822.

Enclosure is Galaxy GX148, which also works as heatsink for the regulator.

More pictures here:

March 5, 2011

Squeezebox PSU now inside DAC

Here's my 5v linear power supply for my Squeezebox Touch, identical with the first one I made.
I've placed the PSU inside my DAC 05 from Danish Audio Design.

Update October 2011: Added power switch and LED on the front. LM350 instead of LM317.

January 20, 2011


My present analogue setup.
Le Tallec Stad1 turntable with Mission 774 tonearm & Goldring 1042 cartridge.
More pictures of turntable.

The Rotel RQ-970BX phono amp was modified after the article by Andy Grove in 'Hi-Fi World' Nov. 1994. I use LME49710 op-amps in input stage and OPA627 in output stage. Also replaced all resistors with Dale CMF55. MUR860 rectifiers, silver wire, new enclosure. More pictures: https://picasaweb.google.com/xl1200cc/ModifiedRotelRIAA

December 16, 2010

LM3886 integrated amplifier

Have now built this LM3886 amplifier with opamp pre stage, based on pcb from Jim's Audio.
It also has a 3-band tone control, input selector board and speaker protection.

More Pictures.


November 24, 2010

Class A Headphone Amplifier

Made this High Speed Class A headphone amplifier, based on a 1980 circuit published in Danish magazine 'High Fidelity'. Thanks to Max Jens Jensen for designing and fabricating the PCB.

Details: MU-metal around toroid, U860 diodes, ROE capacitors, BG Nx input caps, PRP and Mills resistors, Elna Silmic, ERO MKP 1837, gold plated signal wire, pure silver wire for PSU and output, Neutriks 1/4" jack socket, Galaxy enclosure.
More pictures.

November 13, 2010

Linear Power Supply for Squeezebox Touch

LM317 5v PSU for my Squeezebox Touch.
Built on the AudioSector generic PSU board (positive side).
2 x 9V transformer, ROE 4700uf, Siemens Sikorel, ERO MKP1837, Elna Silmic II, Dale resistors. Built in an old Camera PSU enclosure.

Makes the SB Touch shine.
More pictures.