Thursday, 30 May 2013

Sony DTC-1000ES Digital Audio Tape DAT with Sony CX20018 ADC and Philips TDA1541A DAC inside

Sony DTC-1000ES DAT Player

Not Working, but very beautifull Player!
Elna Audiograde Capacitors.
Philips TDA1541A - SAA7220P/B Chipset for DAC
Sony CX20018 for ADC

Sony CX20018 ADC 

Philips TDA1541A

To restore and repair.....

Tuesday, 14 May 2013

HTA: Hitachi Top Mosfet Amplifier 100W Project Using 2SK1058 2SJ162

 Hitachi Top Mosfet Amplifier Project

All Semiconductors, BJT - Mosfet.
Only Schematic.

Download Mosfet Amplifier Schematic pdf

HTA: Hitachi Top Amplifier
B Class Mosfet Power Amplifier, using Hitachi's Mosfets 2SK1058-2SJ162.
Input differential stage and VAS stage are like Sony's ES 90's  amplifer.
VAS is Cascode Configuration.
Output Stage use 4 devices, 2 N channel MOS and 2 P channel MOS, note the power voltage rail is NOT regulated, the signal voltage should be... anyway they must be separated.

100W Continuos Power into 8 ohm could be obtained with appropriate Power Supply

Hitachi's Mosfet Amplifier Project 

My Personal GY50 Hybrid Amplifier 50W 8 ohm

My Personal Copy of Famous Aloia Hibrid Amplifier GY50. Amplificatore GY50 .

Amplifier using Vacuum Tube, ECC83/12AX7, for VAS Stage and Triple Stage of Emitter Follower in the Output Power Stage.
Power Output Devices; Toshiba 2SC3281 2SA1302.
All Regulated Power Supply.
No Overall Negative Feedback.
50W/8ohm, THD<1%
Made by Altium Design / Protel  CAD Database

Regulated Power Supply of  Power Stage

Output Power Stage Triple Emitter Follower

Vacuum Tube VAS Stage

Vacuum Tube Power Supply 

Amplifier and Power Supply  PCB , Printed Circuit Boards:

Power Output Stage, Output devices 2SC3281-2SA1302

Signal VAS Prited Circuit Board 12AX7/ECC83

Signal Stage Power Supply

Current Buffer Regulated Power Supply