Squeezebox Classic

August 16th, 2009

This is the version 3 of Squeezebox (SB3) and I can get it about 1,500 HKD in Mongkok computer center, Hong Kong.

This network player must be used with a computer or a NAS (network attached storage).  I use both as I have a old Qnap TS-201 NAS.  This is really a pain to install the squeezecenter in the Qnap as there is no more support from Qnap.  Finally I get it done with the help of the link here.


The SB3 has both optical and SPDIF (RCA) out plus a two channel analogy output.  I do not use the analogy out put but only the digital input and my D1V3 or D1V33 DAC.  I have modified the SB3:

  1. Outbox 5V 1.5A linear regulator to replace the stock switch mode power adapter.
  2. Add 3.3V regulator for CPLD and HCU04 ICs which hopefully can improve the jitter of SPDIF signal.
  3. Sync one of the clock to CPLD (11.2896MHz) from outside DAC – D1V3 via a SMA coaxial cable.
  4. Finally I settle with a XO to replace outside clock due to flexibility of my DAC to receive different sampling frequency from 32kHz to 96kHz.

Ok, the sound!

I would say SB3 is very good relative to normal CD/DVD Player (I have Marantz DV7600 and Yamaha DVD S2300MKII) or low cost transport.  Compare to CD-PRO2, it lack the lower bass authority.  Other than lower frequency, I think the SB3 is very good in mid and high frequencies.  This is a real bargain if you use it to replace your CD transport!

Rubidium Atomic Clock FE-5680A

August 12th, 2009

If you are lucky, you may be able to get one of this used atomic frequency standard for about US$100 from ebay.  This is a programmable clock from 1Hz to 20MHz.  With the low phase noise of this clock, it is the best choice to create a super clock standard using FE-5680A.  The supply of this clock use 15Vdc and current about 2A.  After warm up for 10 minutes, the current will drop to about 0.75A.  Thus the continue power consumption is about 12W which is quite a lot and thus the metal body should be attached to a heat sink or metal chassis for cooling.

Currently I am using this Rubidium Frequency Standard at 10Mhz as the reference frequency for other equipment like frequency counter or AP-2522 etc…

There are two documents that I can find from internet which are very useful for using this super low noise clock.

FE 5680A modifications

FE-5680A pinout jap

If I have time, I shall put this super clock into a chassis with all the connectors and power supply all in one box…  It is something like a reference clock used in a studio to sync all the digital equipment.

PlayonHD – Eaget Media Player

August 9th, 2009

Whether A.C. Ryan or Eaget brand, this HD Media player is very similar.  Eaget is the China brand while AC Ryan is selling outside China.  The player can house one max 2T hard disk and it can playback almost every video or audio format found!  My set is a Eaget which cost me about US$150.  The only difference between PlayonHD is the remote control and I have tested that the PlayonHD firmware is able to be used in the Eaget set.  But I think I need a Playon remote to control the Eaget set as the key on Eaget remote is nto function accordingly.

You can use this cheap player to replace your transport and put all music file into the internal hard disk.  There is high potential for media player to replace CD player or Transport.  At this moment, only small brand are making lots of this players but I believe the big name is going to sell some better design media player in near future.

It uses a Realtek chipset and everything is done by this chipset even the digital output signal is directly from the chipset!  Thus nothing much can be modified inside!

As a digital source, it sound really ok with such a low investment!  The only thing I don’t like is that you must connect it to a TV so that you can search in the hard disk folder to select and play your music!  It is really a product for Video only.

MBL 8006 clone

July 21st, 2009

This is a clone kit from China.  It is a class AB amp and the clone is only for the power amp part.  The measured result shows a very good design amplifier!

  1. Gain: 18x
  2. Supply Voltage +/-50V; with 36V x 2 AC transformer
  3. Distortion at 1W 8.2ohm: 0.0044% 30kBW
  4. Current drain at idle: 160/153mA.
  5. Current drain at 1W output: 260/253mA
  6. Op-amp: 4.5mA
  7. 470 ohm resistor: 1.75mA
  8. 33 ohm resistor: 24mA
  9. Output offset: 0.8mV
  10. Current diode is 2mA 100V, metal can

1W 8 ohm fft with hp ps

50W 8 ohm fft with 500va

MBL distortion vs input level


June 11th, 2009

This is D1V33 completed in April 2009 and currently is still on sales.

Price refer to “D1V33 BOM” and Kit details refer to “D1V33 Assembly Manual” below:


D1V33 Silk Top

D1V33 Circuit Diagrams

D1V33_BOM *Updated on Jan 15, 2010*

D1V33 Assembly Manual

D1V33 FFT 1

D1V33 FFT 2

D1V33 FFT with PCM1704