AMB Laboratories Mini3 Manual Download Page 30

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Part

Quantity

Description

Mouser #

Digi-Key #

Other

PCB, L1L, L1R, L1G, B+, B-

Mini³ printed circuit board (includes three ferrite beads and one set of

board-mount battery contacts)

Volume/Power

Alps RK0971221Z05 10KΩ stereo potentiometer with SPST switch

R1L, R1R, R1G, R3L, R3R, R4G

miniature 1% metal film resistor 330Ω

270-330-RC

P330CACT-ND

Farnell 9343032

R2L, R2R

miniature 1% metal film resistor 100KΩ

270-100K-RC

P100KCACT-ND

Farnell 9342427

R4L, R4R

miniature 1% metal-film resistor 1.5KΩ

270-1.5K-RC

P1.50KCACT-ND

Farnell 9342621

R5L, R5R

miniature 5% or 1% carbon-film or metal-film resistor 6.2Ω

299-6.2-RC

P6.2BACT-ND

Farnell 9343504 (6.8Ω)

miniature 1% metal-film resistor 5.6KΩ

270-5.62K-RC

P5.60KCACT-ND

Farnell 9343369

miniature 1% metal-film resistor 10KΩ

270-10K-RC

P10.0KCACT-ND

Farnell 9342419

miniature 1% metal-film resistor 75Ω

270-75-RC

P75.0CACT-ND

Farnell 9343555

solid dipped tantalum capacitor 10µF 25V

80-T350E106K025AT 399-3565-ND

Farnell 9708448

C3a, C3b

aluminum electrolytic capacitor 470µF 16V

647-UHE1C471MPD

or 647-

UPW1C471MPD6

P10247-ND or

P12376-ND

Farnell 1219462

C4, C6, C7+, C7-, C8+, C8-

multilayer ceramic X7R capacitor 0.1µF 50V

80-

C320C104K5R5CA

399-4264-ND

Farnell 1141775

C5+,C5-

aluminum electrolytic capacitor 100µF 25V

647-UHE1E101MED

or 647-

UPW1E101MED

P10269-ND or

P12924-ND

Farnell 1219466

LM317L voltage regulator TO-92

512-LM317LZ

LM317LZ-ND

Farnell 9488545

7812 voltage regulator TO-220

512-LM7812CT

MC7812ECT-ND

Farnell 9666109

TLE2426CLP precision rail-splitter TO-92

(For Mini³ "high performance" edition)

OPA690ID operational amplifier SOIC-8

(For Mini³ "extended runtime" edition)

LMH6642MA operational amplifier SOIC-8

(For Mini³ "high performance" edition)

AD8397ARDZ dual operational amplifier SOIC-8

(For Mini³ "extended runtime" edition)

LMH6643MA dual operational amplifier SOIC-8

D1, D2, D3

1N4001 1A rectifier DO-41

512-1N4001

1N4001FSCT-ND

Farnell 9564993

BZX55C12 12V 500mW zener diode DO-35

LED1

T-1 (3mm) super-bright LED (red, for charge indicator)

(your choice)

LED2

T-1 (3mm) super-bright LED (blue, for power on indicator)

(your choice)

DC power jack 2.5mm pcb-mount

J2, J3

3.5mm stereo mini phone jack, pcb-mount, isolated

heat-sink thermal compound (electrically non-conductive)

567-120-SA

345-1006-ND

Radio Shack 276-1372

imperial #4-40 or metric M3 low-profile pan-head machine screw, 3/8"

or 10mm long and matching hex nut (for U2 mounting)

local hardware store

Hammond

546-1455C802

HM970-ND

Farnell 4272936

1455C802 or

546-1455C802BK

Farnell 9287906

1455C802BK or

546-1455C801

HM969-ND

Farnell 4272810

1455C801 or

546-1455C801BK

Farnell 9287787

1455C801BK

volume knob, silver or

226-3003-ND

volume knob, black

226-4003-ND

9V NiMH rechargeable battery

Thomas Distributing

CTA 325mAH or 275mAH recommended

or other vendors

412-112053

(for 120VAC 60Hz

USA, rated

12V/500mA, actual

~17VDC unloaded)

1 set

Precision drilled and engraved front/rear aluminum panel set

imperial #6-32 or metric M3.5 flat-head socket cap screws (for front

and rear panel)

McMaster-Carr or local
hardware store

imperial #6-32 or metric M3.5 thumb screws (for rear panel)

534-2406

McMaster-Carr or local
hardware store

AMB audio shop

Wallwart

AC-DC adapter, 15VDC-24VDC, 300mA minimum, 2.5x5.5mm barrel

plug, center positive

Jameco 189982 (for 120VAC
60Hz USA), or Farnell 1217107
(for 230VAC 50Hz Euro), or
Farnell 1217103 (for 230VAC
50Hz UK), or local electronics
store

Optional items

Knob

Battery

Diodes

AMB audio shop

Miscellaneous

AMB audio shop
AMB audio shop

Case

AMB audio shop

Integrated Circuits

AMB audio shop

Circuit board

AMB audio shop

Potentiometers

AMB audio shop

Resistors

Capacitors

Summary of Contents for Mini3

Page 1: ...sion 1 was never released Version 2 is the current offering featuring a smaller sturdier and more attractive aluminum case The technical difficulties with version 1 were solved in version 2 and the battery run time has been greatly increased See the History section for details Unless otherwise noted all information in these pages pertain to Mini version 2 There are two variants of Mini the high pe...

Page 2: ...engraved panel set Why not offer a full kit AMB is not prepared to stock all the needed parts and offer them as a full kit This amplifier is AMB s contribution to the DIY community rather than a for profit product AMB cannot assume the commercial support role that might be implicit with a full kit However to make sourcing parts easier AMB includes the PCB mount battery contacts and the ferrite bea...

Page 3: ...r supply with positive ground and negative outputs which in the Mini would require two batteries and resulting in a larger less portable case a single 9V battery is employed and a virtual signal ground is synthesized by using a TLE2426 precision rail splitter chip This simplifies the power supply yet provide the advantage of a dual tracking split supply without associated complexity The result is ...

Page 4: ...uts anywhere between 15V DC to 24V DC actual voltage with a minimum current rating of 300mA for battery charging and for running the amplifier Onboard voltage regulation allows a low cost unregulated linear AC to DC adapter to be used while protecting the opamps from being damaged by over voltage The charging circuit utilizing a LM317L voltage regulator wired as a constant current source safely ch...

Page 5: ...opper islands beneath the SOIC 8 opamps allows improved heat dissipation when a small amount of heatsink compound is applied especially for the AD8397ARDZ opamp which has a thermal E pad at the bottom A strip of the ground plane is exposed along each bottom side allowing the amplifier s signal ground to be electrically connected to the case via the board slots without the need to add any wires The...

Page 6: ...Schematic diagram The following is the schematic diagram of the Mini amplifier See the Parts list section for more details Here is the same schematic diagram in PDF format 34KB ...

Page 7: ...tput channel The V and V supply rails are connected to U3 the precision rail splitter chip It derives a virtual ground IG which is centered halfway between V and V it ensures maximum possible output voltage swing and symmetrical clipping when the amplifier is driven into overload In effect the rail splitter offers the characteristics of a tracking dual rail power supply from a single battery at a ...

Page 8: ...rd The Mini circuit board is made of high quality FR 4 glass epoxy double layer with plated through holes as well as silkscreen and solder mask It is intended to slide into the bottom slot of a Hammond 1455C801 or 1455C802 extruded aluminum case The board dimensions are 1 9875 x 3 1375 50 48mm x 79 69mm and is 0 062 1 58mm thick Photos of the top and bottom side of the circuit board are shown belo...

Page 9: ...The following is a view of the silkscreen layer You may also view the following ...

Page 10: ... panel set from AMB then you may skip this section and read the Notes below The information here is relevant if you will be drilling your own panels Since all Mini panel components DC power jack input output jacks LED indicators and volume control potentiometer are board mounted it is important that the holes on the front and rear panels be drilled accurately to match The following diagrams and ta...

Page 11: ...ard the plastic bezels provided and mount the panel directly to the case The bezel pads the panel about 0 065 1 65mm away from the edge of the circuit board causing the front 3 5mm stereo mini jacks to become recessed possibly preventing the plugs from seating properly The plastic bezel also creates an unsightly gap around the rear DC power jack and possibly preventing the DC power plug from makin...

Page 12: ...meter panel nut Some knobs would rub against the nut unless mounted with a large gap to the panel The potentiometer is securely attached to the board via eight solder joints and does not need additional reinforcement Similarly if you have a plastic front panel and are using non isolated 3 5mm stereo jacks with a threaded collar you may omit the panel nuts The indicator LEDs should be mounted with ...

Page 13: ...eries Farnell o other similar Notes about all resistors The Mini circuit board is designed for miniature through hole axial lead 1 8W or 1 4W resistors with a body length no longer than 4mm the recommended Xicon Panasonic and Multicomp resistors are 3 5mm or 3 2mm and no wider than 1 9mm Do not use oversized resistors in particular do not mount resistors vertically tombstone style The extra lead l...

Page 14: ...er for extended periods of time even when the battery is fully charged The drawback is longer time to charge the battery from a totally drained state back to full charge Depending on the capacity of the battery it may take 15 hours or more You could decrease the value of this resistor to increase the charge current The formula is I 1 25V R where I is the charge current in Amperes and R is the valu...

Page 15: ...ther similar C5 C5 aluminum electrolytic capacitor 100µF 25V low ESR high reliability Lead spacing 0 100 2 5mm radial diameter 0 250 6 3mm maximum height 0 59 15mm o Panasonic FC Digi Key o Panasonic FM Digi Key Farnell o Nichicon HE Mouser o Nichicon PW Mouser Notes about C4 and C6 If you prefer you may use 10µF 16V solid dipped tantalum capacitors 0 100 lead spacing radial in these locations Ple...

Page 16: ...There is no substitute part for this Opamps The recommended opamps for Mini high performance edition is as follows U4 Texas Instruments Burr Brown OPA690ID SOIC 8 AMB audio shop Mouser Digi Key Farnell U5 Analog Devices AD8397ARDZ SOIC 8 AMB audio shop The recommended opamps for Mini extended runtime edition is as follows U4 National Semiconductor LMH6642MA SOIC 8 AMB audio shop Digi Key Farnell U...

Page 17: ...d panels Mouser Digi Key Newark Farnell A precision drilled engraved aluminum front and rear panel set is available from AMB audio shop Use these for ease of build upgraded appearance and to assure a perfect fit The Mini s shown in the Overview section are equipped with these panels Volume knob The Alps volume control used in the Mini has a 6mm 0 236 D shaft so the volume knob should be made for t...

Page 18: ...s are available from various sources including Thomas Distributing and zbattery com in the US You can try another brand of 9V NiMH battery but you ll have to check the fitment AC DC adapter Due to Mini s onboard voltage regulation the AC DC adapter requirement is not very stringent It should be a linear adapter not switching to avoid high frequency noise but does not need to be regulated It must o...

Page 19: ...moisture While you look at the board layout please also take the time to look at the schematic diagram and associate each part with their location in the circuit While this is not normally required to build a working amplifier one of the opportunities of DIY is to learn about how the circuit works Try to determine what each part does and why the particular part or value is chosen There are many we...

Page 20: ...e the thermal compound does not ooze out the sides and the pin orientation is correct The side of the opamp with pin 1 is beveled and usually has a dot denoting pin 1 Viewing the board with the Mini logo proper side up the pin 1 pad of both U4 and U5 are at the bottom left side Press the tweezer tip on the top of the opamp to keep it from shifting while soldering Apply only a tiny amount of solder...

Page 21: ...p When you are done with the opamps use a Q tip and isopropyl alcohol or specialized electronics flux remover to clean off the flux Now mount and solder the rest of the parts starting with the lowest profile parts and work up in the following order see details below Resistors Diodes Multilayer ceramic capacitors Voltage Regulators U1 U2 Rail splitter chip U3 Ferrite beads L1L L1R L1G Tantalum capa...

Page 22: ...rom the board surface allowing at least 1 8 3 2mm clearance as shown in the following picture The U2 voltage regulator should have its pins bent 90 downward for insertion into the board You must check that the mounting hole is aligned properly while the pins are bent to fit their pads Apply a small amount of heatsink compound to the bottom of the regulator to help it transfer heat to the board No ...

Page 23: ...f the battery is too thick the whole assembly may not fit into the case In that event you can file away a portion of the bottom of the battery contacts to eliminate the gap and obtain additional clearance See the following diagram When soldering the battery contacts it will help to first secure the battery and contacts to the board by wrapping several turns of rubberband around the whole assembly ...

Page 24: ...e pulling on the ribbon will pop the battery out easily after the rear panel is removed If you have a black anodized Hammond case you should grind away some of the anodizing from the board slot in order for the exposed ground plane strips on the bottom of the board to make contact with the case This provides RFI shielding You do not need to do this with the clear anodized version The board will go...

Page 25: ...Wavetek 188 4MHz sweep function generator 2 Tektronix TDS2014B 100MHz quad trace digital storage oscilloscope 3 Protek 6510 100MHz analog dual trace oscilloscope 4 Fluke 95 50MHz digital dual trace ScopeMeter 5 Fluke 187 digital multimeter 6 Toshiba Satellite A65 laptop computer with Celeron 2 8GHz CPU and 768MB RAM 7 M Audio Firewire Audiophile mobile interface 8 RightMark Audio Analyzer 5 5 soft...

Page 26: ... power 11Vp p 3 9Vrms with external power Power output 300mWrms into 33Ω 30mWrms into 330Ω 180mWrms into 33Ω 30mWrms into 330Ω Frequency response at 0dBV output 0Hz 4MHz 0 3dB limited by function generator Rise time 100KHz square wave at maximum output 10 to 90 166nS 54nS Slew rate 100KHz square wave at maximum output 52V µS 162V µS Quiescent current battery current draw while power on 25mA 10mA N...

Page 27: ... load Mini high performance edition 330Ω load vs 33Ω load Mini extended runtime edition 330Ω load vs 33Ω load Comments on the RMAA test results The measured performance with 300Ω load is excellent for both Mini editions exhibiting extremely low THD and IMD distortion low noise floor and low stereo crosstalk through the entire audio frequency range There is virtually no degradation of performance o...

Page 28: ...roduced by a Wavetek 188 4MHz sweep function generator The following are the 100KHz square wave rising edge response of the Mini high performance and extended runtime editions as tested with a Tektronix TDS2014B 100MHz digital storage oscilloscope The rise time as well as the peak to peak output amplitude is shown on the right hand side of the display As could be seen the extended runtime edition ...

Page 29: ...are wave 10KHz square wave 100KHz square wave 100KHz sine wave 100KHz triangle wave 100KHz Lissajous Mini extended runtime edition 1KHz square wave 10KHz square wave 100KHz square wave 100KHz sine wave 100KHz triangle wave 100KHz Lissajous ...

Page 30: ...xtended runtime edition LMH6643MA dual operational amplifier SOIC 8 D1 D2 D3 3 1N4001 1A rectifier DO 41 512 1N4001 1N4001FSCT ND Farnell 9564993 D4 1 BZX55C12 12V 500mW zener diode DO 35 LED1 1 T 1 3mm super bright LED red for charge indicator your choice your choice your choice LED2 1 T 1 3mm super bright LED blue for power on indicator your choice your choice your choice J1 1 DC power jack 2 5m...

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