SPHINX Project Twelve Service Manual

Download or browse on-line these Service Manual for SPHINX Project Twelve Amplifier.

SPHINX Project Twelve Manual Information:

This manual for SPHINX Project Twelve, given in the PDF format, is available for free online viewing and download without logging on. The guide contains 23 pages, and the size of the file at download is . The document type is Service Manual.

Download Manual

More Manuals:

In case you failed to obtain relevant information in this document, please, look through related operating manuals and user instructions for SPHINX Project Twelve. Just click one of the links below to go to the selected manual:

Summary of Contents:

[Page 1] SPHINX Project Twelve

1. SERVICE MANUAL PROJECT TWELVE MONO POWER AMPLIFIER ...

[Page 2] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 2 Contents 1. UNPACKING .......................................................................................................................................3 2. SPHINX WARRANTY CARD ......................

[Page 3] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 3 The Sphinx Project Twelve design The Sphinx Project Twelve was designed for the ever-increasing group of quality-conscious audiophiles. We are very proud of the tradition connected with the SPHINX name,...

[Page 4] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 4 4. THE POWER AMP AT A GLANCE Front panel 1. LED: Indicates the selected function: stand-by red on green protection blinking red. 2. STANDBY: To switch the component on and off. ...

[Page 5] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 5 Rear panel 3. BALANCED/UNBALANCED: With this switch you may select the balanced input (5.) or the unbalanced input (8). 4. CONTROL IN: To connect the optical cable from another Sphinx component like a p...

[Page 6] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 6 5. TECHNICAL SPECIFICATIONS Bandwidth 0 - 1.5 MHz (+0/-3 dB) 0 - 203,000 Hz after RF input filter Phase response error <1° (0 - 20,000 Hz) Gain (balanced) 29.5 dB max. (x 29.9) ( unbalance...

[Page 7] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 7 6. GENERAL CHECKLIST Before you test or service the Project Twelve please check the following items. They will give information about the current status of the amplifier. Note: The Project Twelve will b...

[Page 8] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 8 7. USING THE AMP WITHOUT PROTECTION CIRCUIT To adjust the internal controls of the Project Twelve the protection circuit board may be removed. This ensures that all adjustment points on the main board ar...

[Page 9] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 9 8. ADJUSTMENT PROCEDURES The Project Twelve has three adjustable settings: 1. Bias: to set the bias current of the power-FETs 2. Offset: to set the minimal DC voltage for the output 3. Common Mode: to ma...

[Page 10] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 10 Offset The Offset adjustment procedure minimises the DC offset value of the amplifier output. This DC offset is important when capacitive loads are used, such as electrostatic loudspeakers. These loudsp...

[Page 11] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 11 9. PROBLEMS AND SOLUTIONS At the moment of writing the Project Twelve has one known specific problem. If in the future you encounter any problem(s) you may enter the info in this table. This table can t...

[Page 12] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 12 10. DIAGRAMS AND PARTS LISTS The next pages contain a complete set of schematic drawings including the associated parts lists (if applicable). Connection diagram for testing the project 12.................

[Page 13] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 13 Connection diagram for testing the project 12 out1 out2 inp2 inp1 gnd THD Amplitude Frequency Oscillator THD out (+) (-) (+) (-) x y inp2 time/div inp1 gnd N.C. N.C. A A Project Twelve Voffset ...

[Page 14] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 14 Schematic layout of project 12 with securityprint Project Twelve main board Security Print Large Connector screw screw Attached to heatsink Attached to heatsink PTC-connector PTC-connector Input wires...

[Page 15] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 15 Schematic layout of all relevant parts P2 Biasing P1 Offset P3 Com. mode R45 Source resistor R40 Source resistor R31 Source resistor R30 Source resistor R39 Source resistor R43 Source Resistor Jp1 Jp2 J...

[Page 16] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 16 Project 12 amplifier diagram C2 220pF R1 1K R2 18K GND R5 22K R6 120K R7 820R R8 820R R9 22R R10 22R R11 1K R12 475R C3 1uF C12 100nF C11 220uF/100V P3 100R P1 200R C1 1nF GND GND GND Sig1+ Sig1- Agnd1 ...

[Page 17] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 17 Project 12 protection diagram RA2 1 RA3 2 RA4 3 /MCRL 4 GND 5 RB0 6 RB1 7 RB2 8 RB3 9 RB4 10 RB5 11 RB6 12 RB7 13 VCC 14 X2 15 X1 16 RA0 17 RA1 18 IC282 PIC16C71 C208 1n R208 4k7 C210 100n + C209 1µ5/1...

[Page 18] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 18 PCB drawings of Project 12 Because there is a significant image-quality loss during the conversion of the drawings, the PCB-drawings are located in seperate files. These files are in PDF-format (Adobé ...

[Page 19] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 19 Partlist amplifier Designator Part Type Description C1 1nF Capacitor C10 100uF/16V Capacitor C11 220uF/100V Capacitor C111 220nF/250V Capacitor C112 C220nF/250V Capacitor C113 1000uF/100V Capacitor C114...

[Page 20] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 20 Designator Part Type Description L1 EE-K-021 Coil M14 2SK1529 Transistor M15 2SJ200 Transistor M17 2SK1529 Transistor M18 2SJ200 Transistor M19 2SK1529 Transistor M20 2SJ200 Transistor Opto1 OPTO COUPLE...

[Page 21] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 21 Designator Part Type Description R33 10R/5W Resistor 5W R34 10R/5W Resistor 5W R35 220R Resistor R36 100R Resistor R37 100R Resistor R38 0.22R Resistor 5W R38 68R Resistor R4 18K Resistor R40 0.22R Resi...

[Page 22] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 22 Partlist protection Designator Part Type Description C201 10µ/25V Electrolitic capacitor C203 100n MKT capacitor C203 100n MKT capacitor C204 100n MKT capacitor C206 100n MKT capacitor C207 100n MKT ca...

[Page 23] SPHINX Project Twelve

SPHINX Project Twelve Service Manual 23 Designator Part Type Description R211 560R Resistor R212 100k Resistor R213 560R Resistor R214 2k2 Resistor R215 2k2 Resistor R216 2k2 Resistor R217 4k7 Resistor R218 10k Resistor R219 4k7 Resistor R220...