Texas Instruments TPA6120A2 User Manual

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
 
User’s G uide
May 2004 HPA Audio Power
SLOU169
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IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty . Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation.
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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
Page 3
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR S TA TUT ORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A NY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards. No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
Page 4
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the supply voltage range of ±5 V to ±15 V. Exceeding the specified supply range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the supply range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 125°C. The EVM is designed to operate properly with certain components above 125°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
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About This Manual
How to Use This Manual
Preface

This users guide describes the characteristics, operation, and use of the TPA6120A2 evaluation module (EVM). This users guide includes EVM description, performance specifications, board layout, bill of materials (BOM), and schematic diagram.
How to Use This Manual
This document contains the following chapters:
- Chapter 1 – Introduction
- Chapter 2 – Getting Started
- Chapter 3 – Customizing the EVM
- Chapter 4 – EVM Circuit and Layout
Related Documentation From Texas Instruments
SLOS431 − TPA6120A2 data sheet
If you need Assistance
Contact your local TI sales representative.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.
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Contents

1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Description 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specification Summary 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Getting Started 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Power Supply 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Inputs and Outputs 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Power Up 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Customizing the EVM 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Inverting Configuration 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Differential Configuration 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Special Note on Gain and Input Configuration 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Single Power Supply Configuration 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 EVM Circuit and Layout 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 TPA6120A2 EVM Top Layer 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 TPA6120A2 EVM Bottom Layer 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Component Selection 4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Input Bias Voltage 4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Schematic 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Bill of Materials 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents

2−1 Top Layer With Numbered Callouts 2-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 Top Layer of the TPA6120A2 EVM 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−2 Bottom Layer of the TPA6120A2 EVM 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−3 TPA6120A2 EVM Schematic 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−1 TPA6120A2 EVM Performance Specifications 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 TPA6120A2 EVM Bill of Materials 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1

The TPA6120A2 is a high-fidelity audio amplifier. The amplifier can operate from a split power supply, and is designed for low noise, high dynamic range performance.
Topic Page
1.1 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specifications 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
1-1
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Description
1.1 Description
The TPA6120A2 EVM is designed to operate specifically with a split power supply, and is configured such that both left and right channels have a noninverting gain of 2 V/V. The output signal is routed into RCA jacks J1 and J2, as well as the 1/4 inch headphone jack, J10. The EVM is approximately 3 inches x 3 inches square, and comes complete with standoffs.
1.2 Performance Specifications
Table 1−1.TPA6120A2 EVM Specifications
Supply voltage range, V Power supply current rating required 1 A Continuous output power, Po: 32- stereo, V Audio input voltage, V Minimum load impedance, Z
CAUTION
I
CC
(L)
= ±12 V 2 W
CC
TPA6120A2
±5 V to ±15
−VCC to V 8
CC
1) Accidental swapping of supply polarities causes damage to the device and can cause damage to the other components on the board.
2) Do not short the outputs of the TPA6120A2 to either the positive or negative supply when operating with a split power supply. When operating with a single power supply, do not short the outputs to the positive supply. This damages the device.
1-2
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Chapter 2
 
Follow these steps to use the TPA6120A2 EVM in its original configuration. No soldering is necessary . Connection to the TPA6120A2 EVM can be made with banana plugs, RCA jacks, and a 1/4 inch headphone jack. See Figure 2−1 for an illustration of the top layer.
Topic Page
2.1 Power Supply 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Inputs and Outputs 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Power Up 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
2-1
Page 12
Power Supply
2.1 Power Supply
1) Make sure all external power supplies are turned off.
2) Connect an external power supply with the positive voltage set between 5 V and 15 V to the terminal marked +12 V (J8) on the EVM.
3) Connect the negative voltage to the terminal marked −12 V (J9), making sure the negative voltage is set to the same magnitude as that of the positive (i.e., ±5 V, ±12 V, ±15 V).
4) Connect the ground of the external supply to the terminal marked GND (J7) on the EVM.
2.2 Inputs and Outputs
5) Ensure the signal source is turned off or set to a minimum.
6) Connect the left signal source to the RCA jack labeled LIN+ (J5), and the right signal source to the RCA jack labeled RIN+ (J6).
7) Insert headphones into 1/4 inch headphone jack, J10.
2.3 Power Up
8) If desired, RCA Jacks J1 and J2 may be used instead of the headphone jack for load driving purposes. The RCA jacks and the headphone jack should not be used together when both are driving a load. One may be used to drive a load while the other is used for measurement purposes.
9) Verify correct voltage polarity on the supplies.
10) Make sure the signal source is going into the positive inputs only. Do NOT connect anything to the negative inputs—this shorts the output of the signal source directly to ground (see schematic in EVM Circuit and Layout section)
11) Turn on the power supply.
12) Turn on the signal source.
13) Adjust signal source level as needed.
2-2
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Figure 2−1.Top Layer With Numbered Callouts (From paragraphs 2.1 through 2.3)
878
2 9
Power Up
3 9
6
6
4
Getting Started
2-3
Page 14
Power Up
(This page has been left blank intentionally.)
2-4
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Chapter 3
  
The TPA6120A2 EVM comes in a noninverting configuration with a gain of 2 V/V. However, the EVM is designed to be flexible, and can be converted to operate in inverting and differential configurations. The TPA6120A2 EVM can also be operated in a single power supply configuration.
Topic Page
3.1 Inverting Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Differential Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Special Note on Gain and Input Configurations 3-2. . . . . . . . . . . . . . . . . .
3.4 Single Power Supply Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customizing The EVM
3-1
Page 16
Inverting Configuration
3.1 Inverting Configuration
The TPA6120A2 EVM can be converted to operate in an inverting gain configuration. To d o this, it is necessary to remove resistors R1 1 and R12, then connect the audio source to RCA jacks LIN− (J3) and RIN− (J4) instead of LIN+ (J5) and RIN+ (J6). With the feedback and input resistors already in place on the EVM, the gain is set to −1 V/V (R
3.2 Differential Configuration
The TPA6120A2 EVM can also be converted to operate in a differential input configuration. Remove resistors R11 and R12. Resistors R9 and R10 must be removed and replaced with resistors whose values match those of resistors R3 and R4, respectively. The 49.9-Ω input series resistors, R7 and R8 must likewise be removed and replaced with resistors whose values match those of input resistors R1 and R2, respectively. Both positive and negative input jacks should be used. Assuming the feedback resistors R9 and R3 are equal, and R10 and R4 are equal, and the input resistors R7 and R1 are equal, and R8 and R2 are equal, the gain is set by the following formula:
F/RI
).
R
Gain + 2
F
R
I
3.3 Special Note on Gain and Input Configurations
The TPA6120A2 high-fidelity audio power amplifier has two separate channels, left and right. It is not necessary to operate each channel in the same configuration. For test purposes, it may be desirable to operate the left channel with a noninverting configuration, and the right channel with an inverting configuration. One channel may be configured to operate with differential inputs while the other channel with single-ended inputs. The TPA6120A2 EVM allows for this flexibility. From a listening standpoint, the best audio performance is achieved when both channels are operated with the same configuration. In this case, there is no sound difference between the left and right channels for the human ear to detect.
3.4 Single Power Supply Configuration
The TPA6120A2 EVM was not optimized for single power supply operation. To operate in this mode, the −12-V terminal must be connected to GND. DC-blocking capacitors must be used at the outputs to prevent large amounts of dc current from flowing through the headphones due to the high midrail bias. Likewise, dc-blocking capacitors must be used at the input. Resistors R11 and R12, and resistors R9 and R10 must be removed. The positive input nodes must be biased to midrail. Resistors R9 and R10 tie the positive node to ground.
3-2
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Chapter 4
   
The TPA6120A2 EVM layout was carefully planned to minimize the capacitance and inductance detected by the output and input pins of the amplifier. Test points are available, but intentionally left unpopulated to keep signal interference as low as possible.
This chapter includes the EVM layout, the TPA6120A2 EVM component selection, schematic, and bill of materials.
Topic Page
4.1 TP A6120A2 EVM Top Layer 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 TPA6120A2 EVM Bottom Layer 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Component Selection 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Input Bias Voltage 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Schematic 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Bill of Materials 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVM Circuit and Layout
4-1
Page 18
TPA6120A2 EVM Top Layer
4.1 TPA6120A2 EVM Top Layer
Figure 4−1 shows the top layer of the TPA6120A2 EVM. The RCA jacks at the inputs are configured to short to ground when no plug is inserted. The noninverting configuration of the EVM requires that RIN− and LIN− be at ground. Rather than have the signal go through the long signal trace to get to the input jacks, 0- resistors R11 and R12 are used to provide a connection to ground much closer to the device.
A star point for ground should be chosen. For the TPA6120A2 EVM, the ground terminal of the board is (J7). Current paths to the star ground should be as direct as possible.
Figure 4−1.Top Layer of the TPA6120A2 EVM
4-2
Page 19
4.2 TPA6120A2 EVM Bottom Layer
Figure 4−2 shows the bottom layer of the TPA6120A2 EVM. Note that the copper has been removed from around the capacitive sensitive nodes. It is important to remember that the thermal pad on the underside of the IC must be properly soldered to the board at all times.
Figure 4−2.Bottom Layer of the TPA6120A2 EVM
TPA6120A2 EVM Bottom Layer
EVM Circuit and Layout
4-3
Page 20
Component Selection
4.3 Component Selection
The TPA6120A2 is a high-fidelity audio amplifier. The composition of components is important when dealing with high fidelity. The best practice is to operate the device with a split power supply. This eliminates the need for capacitors in the signal path, which can introduce distortion. Capacitors can also fail after a certain period of time. The failure mode of many capacitors is to essentially turn into a short. If capacitors must be used in the signal path because the device is being used in a single power supply configuration, polystyrene and PPS film capacitors are good choices.
Thin film resistors have excellent noise and distortion performance.
4.4 Input Bias Voltage
The TPA6120A2 EVM is designed to keep a constant dc voltage on the positive input pins of the amplifier. This is done with resistors R9 and R10 which ef fectively tie the positive input pins to ground. This is necessary in most applications to protect the system and its components from unexpectedly high dc currents, and to prevent damage to headphones from both large continuous dc currents and a large POP.
When a source is not connected to the positive node, and the positive node is not tied to ground, it floats, typically up to the rail. A 12-V offset with a 32- load can draw up to 375 mA of current, depending on the size of the output series resistor. When a source is then connected, or turned on and thus taken out of a high impedance state, the offset voltage quickly drops to near 0 V. This large, fast change can cause a loud, potentially headphone damaging POP. The solution is to keep the positive input pin of the amplifier at a constant voltage, regardless of the state of the audio source.
With headphones, permanent damage to the voice coil can begin to occur when the dc voltage across them exceeds 100 mV. The maximum input bias current of the TPA6120A2 is 12 µA. Therefore, the maximum output offset with the audio source off is:
ǒ
(12 mA R9) *ǒ12 mA RFø R
Once the audio source is turned on, the output offset voltage drops to just a few millivolts.
The value for R9 must be chosen carefully. The value has a direct impact on the output offset voltage and the loading of the audio source. In the configuration of the TPA6120A2EVM, where the input and feedback resistors (R1 and R3) are each 1-kΩ, a 500- resistor would be the best choice for offset performance. However, a load of this size can degrade the performance of the audio source. The audio source should have no problems driving a large load such as a 100-k resistor. However, a load of this size can cause as much as
2.4 V of output offset voltage (when the source is left floating).
Ǔ
Ǔ
I
Gain
4-4
Page 21
4.5 Schematic
Schematic
The TPA6120A2 EVM uses 4.02-k resistors to tie the positive terminals to ground. This value is a good compromise between the device’s effect on the performance of the audio source and the output offset voltage. When the source is removed or is off (or high impedance), the maximum output offset value possible with a 4.02-kΩ resistor is about 85 mV. The loading effect on the audio source is minimal since for most sources, a 4.02-k load is seen as high impedance. Going from 4.02 kto 10 kΩ results in a minimal performance increase, but pushes the output offset voltage past the 100-mV threshold.
Figure 4−3.TPA6120A2 EVM Schematic
+12 V
L1
Ferrite
J8 J9
C7
100 mF
To J10 LOUT
J1
LIN+ J5
LIN− J3
R11
C5
10 mF
R15
DNP
R7
49.9 W
R1 1 kW
0.01 W
R5 10 W
0.1 mF
R9
4.02 kW
0.1 mF
R13
DNP
C3
C1
R3
1 kW
LVCC−
LOUT
LVCC+
TPA6120A2
LIN+
LIN−
RVCC−
ROUT
RVCC+
RIN+
RIN−
J7
10 mF
C2
0.1 mF
R4 1 kW
C6
R6 10 W
R14 DNP
C4
0.1 mF
R10
4.02 kW
L2
Ferrite
C8 100 mF
R16 DNP
49.9 W
R2 1 kW
R8
−12 V
R12
To J10
ROUT
J2
RIN+
J6
RIN−
J4
0.01 W
EVM Circuit and Layout
4-5
Page 22
Bill of Materials
4.6 Bill of Materials
Table 4−1.TPA6120A2 EVM Bill of Materials
ComponentQty Value Size
C5, C6 2 10 µF, 50V, +80/−20%, F 1210 Panasonic ECJ−4YF1H106Z Digi−Key PCC2308TR−ND C1, C2, C3,
C4
C7, C8 2
L1, L2 2
R1, R2, R3, R4
R5, R6 2
R7, R8 2
R11, R12 2 10 m, ±2.0% 0805
R9, R10 2
R13, R14 2 Do Not Populate 0805 R15, R16 2 Do Not Populate 1210 J1, J2, J3, J4,
J5, J6
J7, J8, J9 3 Banana Jacks
J10 1 Headphone Jack 1/4” Switch Craft RN112BPC Digi−Key SC1123−ND
U1 1
PCB 1 2 layer 3” x 3”
4 0.1 µF, 50V, ±10%, X7R 0805 Panasonic ECJ−2YB1H104K Digi−Key PCC1840TR−ND
100 µF, Aluminum Electrolytic, 63V, ±20%
Ferrite Bead, 330 at 100 MHz, 2.5A
1 k, ±0.1%, 1/10W,
4
TCR = ±25 PPM/°C 10 , ±0.1%, 330 mW,
TCR = ±25 PPM/°C
49.9 , ±0.1%, 1/10W, TCR = ±25 PPM/°C
4.02 k, ±0.1%, 1/10W, TCR = ±25 PPM/°C
6 RCA Jacks, Black Switch Craft PJRAN1X1U01
4 Aluminum Standoffs
4 Screws 1” #4
IC high-fidelity headphone driver
10 mm x
12.5 mm
0805 TDK MPZ2012S331A Digi−Key 445−1569−2−ND
0805
1206 Vishay P1206E10R0BB
0805
0805
1.00” Round 4−40
20 Pin DWP
Name Number Name Number
Panasonic EEU−FC1J101 Digi−Key P10343−ND
Thin-Film Technology
Thin-Film Technology
Thin-Film Technology
Thin-Film Technology
USM EYELETS
Keystone 3482 Digi−Key 3482K−ND
Texas Instruments
RR1220P102B
RR1220P49R9B
RL1220TR010G
RR1220P4021B
SE−68−Hot Solder Dip
TPA6120A2
Thin−Film Technology
Thin−Film Technology
Thin−Film Technology
Thin−Film Technology
Bisco
RR1220P102B
RR1220P49R9B
RL1220TR010G
RR1220P4021B
SE−68−Hot Solder Dip
Manufacturer Distributor
4-6
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