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UPDATING THE

DYNACO STEREO 120

SOLID STATE

POWER AMPLIFIER:

SUPER HEATSINK

VERSION

Revision 1.12: October 20, 2011

Содержание Stereo 120

Страница 2: ...he Voltage is Much More than 78 volts 14 The Voltage is Much Less than 66 volts 14 There s No Voltage at All 14 Section 5 Building the Updated Circuit Boards 15 Install the Resistors 15 Install the Sm...

Страница 3: ...ts to the PCB 20 Figure 12 Template for checking mounting height of LM3886 21 Figure 13 LM3886 installation step three just the corner pins are soldered 21 Figure 14 The LM3886 sits up off the board t...

Страница 4: ...ng the original modules The only part of your Stereo 120 that really needs to work is the power supply With this kit you ll build good sounding highly reliable amplifiers to replace the original ampli...

Страница 5: ...less for any injuries you may receive in its assembly and or use To prevent injuries Wear safety glasses when soldering to prevent eye injuries Always unplug the power before working on the amplifier...

Страница 6: ...efore starting this section Opening the Amplifier 1 Make sure the amplifier is unplugged If it was recently powered allow the amp to sit for one full minute before proceeding 2 Remove the four screws...

Страница 7: ...nel module cut the following wires in the following places Step Which Wire Where to Cut Done 1 The wire from PC 15 eyelet 5 to LEFT PC 14 eyelet 10 Close to PC 15 eyelet 5 2 The wire from C12 terminal...

Страница 8: ...IGHT PC 14 eyelet 11 Close to RIGHT PC 14 eyelet 11 5 The wire from the RIGHT input socket to RIGHT PC 14 pin 12 typically a black wire Close to RIGHT PC 14 eyelet 12 6 The wire from the RIGHT input s...

Страница 9: ...Page 9 of 32 Figure 2 Location diagram for cutting wires...

Страница 10: ...Page 10 of 32 Figure 3 After the Amplifier Modules have been removed...

Страница 11: ...ected to the LEFT RED Binding post The rest of the wire wrapped around the capacitor will be used to make the new inductor on the UpdateMyDynaco modules Removing the Output Zobel Networks 1 Clip the l...

Страница 12: ...Page 12 of 32 Figure 4 Removal of components is completed...

Страница 13: ...make a test load resistor for the power supply If you know that your power supply and regulator are working correctly you may skip ahead to Section 5 Building the Updated Circuit Boards 1 Keeping the...

Страница 14: ...dynaco com the Power Supply Circuit Description for more information The Voltage is Much Less than 66 volts Most likely the pass transistor is open However repairing the power supply pass module is be...

Страница 15: ...ctor 9 Install the LM3886 Install the Resistors In general you install the resistors by placing the body on silk screen side of the board and the leads through the indicated holes Bend the leads over...

Страница 16: ...R13 100 Brown Black Black Black Brown R1 100K Brown Black Black Orange Brown R2 100K Brown Black Black Orange Brown R3 100K Brown Black Black Orange Brown R5 100K Brown Black Black Orange Brown R7 100...

Страница 17: ...LEDs D2 and D3 Light Emitting Diodes note that in normal operation these diodes will be dark However in a fully darkened room you ll see a dull green glow from the powered LEDs Be careful Light Emitti...

Страница 18: ...off the board The lead length prevents stress on the body and keeps the transistor safe from too much heat during the soldering operation Designation Value Marking Done Q1 2N5551 NPN 2N5551 Q2 2N5551...

Страница 19: ...L1B hole 5 Pull the end of the wire through the L1B hole and solder it on the back of the board Figure 9 Starting to wind the output inductor Figure 10 finishing step for the output inductor Solder th...

Страница 20: ...eded If you miss a right angle by a little don t worry Since you ve only soldered two pins down it s easy enough to reheat those two pins and move the LM3886 up and down a bit until it sits at the rig...

Страница 21: ...M3886 Carefully inspect your soldering Make sure that all pins of the LM3886 are soldered and that there are no solder bridges between pins Inspect the board from both the top and the bottom Figure 13...

Страница 22: ...ge of the board 3 polarity of C1 minus sign away from the indicated plus sign on the silk screen 4 polarity of C6 minus sign away from the indicated plus sign on the silk screen 5 polarity of C7 minus...

Страница 23: ...ar the line into a thin film covering on the back of the LM3886 Save the rest of the thermal compound for other steps in the assembly 3 Assemble the LM3886 and circuit board to the heat sink plate as...

Страница 24: ...age 24 of 32 Figure 16 a completed amplifier module Figure 17 Showing Detail of attaching power wiring harness to C12 Figure 18 Showing the Final Wiring shown with original rather than super heatsinks...

Страница 25: ...upplied black red 18 AWG pairs into two 12 inch lengths Strip of insulation off of the ends of all the wires 8 places Separate the red and black wires for about 5 at one end as shown in the drawing of...

Страница 26: ...ower harness over this screw The nut to hold this in place is added after a later step 7 Form one twisted pair of the power harness along the chassis towards the place where the right channel amplifie...

Страница 27: ...er output terminals should have 16 AWG white wires still connected 1 Form the left channel wire toward the place where the left channel amplifier module will sit 2 Form the right channel wire toward t...

Страница 28: ...Channel Amplifier Module 1 Set the right channel amplifier board in place Don t mount it to the chassis yet Note that the new PCB should face the center of the amplifier chassis 2 For the red and blac...

Страница 29: ...e the hole in the mounting stud 2 Loosen and remove the nut that holds the speaker connection wires Remove the speaker wire lugs noting their locations so that they may be correctly returned 3 Loosen...

Страница 30: ...k speakers up to the binding posts There may be a very soft click as you hook up the speaker 2 The speakers should be rather quiet at this point perhaps with barely audible hiss or hum if you place yo...

Страница 31: ...Page 31 of 32 Figure 22 Schematic of amplifer module...

Страница 32: ...or Number Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Gray 8 White 9 The color band positions have the following meaning Position Meaning 1 Left most Digit e g most significant 2 N...