Adrian Angka Weblog

Linux and DIY Electronics

DVD as CD transport Clock Modification 6 July, 2008

Filed under: CD Transport,DIY High End Audio — adrianangka @ 1:49 pm

My friend gave me this DVD player, because its damaged, he say. But after I tested I found that this China Made DVD player only cannot play DVD, but can play VCD, MP3 and CD. So I decide to use it as a CD transport.

After browsing I found that clock modification on Transport can improve sound quality. So

1. I open the DVD player case and looking for XTAL. And I found the 27 MHz Xtal. So I go to Harco Glodok and looking for the Clock Crystal and an TL431 for voltage stabilizer.

2. I remove the original XTAL, 2 resistor and 3 Capasitor that connected directly to the XTAL

Remove original Xtal

Remove original Xtal

3. After that I make the Clock Generator that is a modification from Kwak Clock and XO from Tent Labs, I cannot use any other circuit because their frequency is limited at 24MHz.

4. This is the circuit diagram. Before input the 12V to this circuit I add IC 7805 to stabilize the voltage. Because I not using separate transformer. I use the 12V from original switching power supply

Reclocker Schematic Diagram

Reclocker Schematic Diagram

5. This is the installed board

Already Assembled Reclocker

Already Assembled Reclocker

Solder The Reclocker Output to the Mainboard

Solder The Reclocker Output to the Mainboard

6. After it finished, I try to listen, and its much more detail and staging is more focused. Very impresive because this little cheap modification

Finished and Installed board

Finished and Installed board

 

Tube Pre Amplifier with Tone Control Schematic Diagram 4 July, 2008

Filed under: DIY High End Audio,Pre Amplifier — adrianangka @ 11:03 am

This is tube Pre Amplifier with Tone Control Schematic Diagram. I separate it into 3 part:

1. The Main Circuit

Main Schematic Diagram

Component List:

Resistor:

0.25 – 0.5 Watt 1%

R1, R2 ………………………………….100R – 330R

R3………………………………………..47K

R4………………………………………..680K – 1M

R7, R8…………………………………..39K

R9, R10…………………………………10K

R11………………………………………68K

R12………………………………………560K – 680K

R13, R14……………………………….100

2 Watt Resistor:

R5…………………………………………1K

RA…………………………………………220K

RB…………………………………………47K

RC…………………………………………3K9

RD…………………………………………680R

Potentiometer:

Vol…………………………………………2 X 100KA

BAL…………………………………………2 X 250KB, CT

BASS, MID,……………………………….2 X 250KB

TRE…………………………………………2 X 100K

Capasitor:

C1…………………………………………..22n/400V

C2…………………………………………..330n/400V

C3, C5……………………………………..100n/400V

C4, C6……………………………………..39uF/450V

C7A, C7B………………………………….8n2 – 15nF/100V

C8…………………………………………..22n/400V

C9A, C9B………………………………….1n/400V

C10A, C10B………………………………3n3/63V

C11…………………………………………1uF/250V

C12, C13………………………………….12p/250V

Semiconductor:

Va, Vb………………………………………Tube 12AT7

Transformer:

T1…………………………………………….In:220V, Out 16VAC, 1A

T2…………………………………………….In:220V, Out 275VAC 40mA

Tube Socket 9pin PCB mount 2X

2. Soft Start Filament Regulator

Component List:

Resistor 0.25 – 0.5 Watt:

R1…………………………………1K5

R2…………………………………470R

R3…………………………………51K

R4…………………………………220R

Capasitor:

C1…………………………………3300uF/50V

C2…………………………………47uF/16V

C3…………………………………470uF/16V

C4…………………………………100nF MKM

Semiconductor:

D1, D2, D3,D4…………………1N4002

TR………………………………….FCS9012

IC…………………………………..LM317T

3. High Voltage Regulator

Component List:

Resistor 0.25 – 0.5 Watt:

R1………………………………….1K

R2………………………………….470K

R3………………………………….330K

R4………………………………….20K

Capasitor:

C1, C2, C3, C4…………………39uF/450V

C5………………………………….10uF/25V

C6………………………………….220nF/250V

C7………………………………….100nF/400V

Semiconductor:

D1, D2, D3, D4…………………1N4007

D5, D6…………………………….1N4148

D7………………………………….1N4744 (15V/1W)

TR1………………………………..MJE13005

TR2………………………………..MPSA92

TR3………………………………..MPSA 42

 

Tube Pre Amplifier with Tone Control

Filed under: DIY High End Audio,Pre Amplifier — adrianangka @ 10:58 am

Front Panel

Today I finished a DIY Tube Pre Amplifier with Tone Control. I made the kit that I bought from Bandung at 2004 . This are some small modification I made:

1. To make the tube glowing at the front panel window I modified the tube socket and pcboard to make a 3mm hole for ultra bright blue LED

Glowing

2. Change the volume potentiometer with ALPS potentiometer.

ALPS Motorized Potentiometer

3. Add Infra Red Controller so I can remotely control the volume

Infra Red Controller

4. Use Jantzen Capasitor and Solen Capasitor so The sound will be good, natural and clear

Capasitor

5. After all this modification I have to burn in so the sound output will be at the best perform of this circuit

6. Tommorow I will post the schematic