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 Initial Series Power Amplifiers

Initial series power amplifiers use plug-in driver and power boards to ease boards swapping for evaluating sonic characteristics of different output configurations.

Discussion on diyAudio forum

  LME49810/49830/49811 Driver Board (New Rev 1.4)

• Compatible with LME49810, LME49811 and LME49830

• Two-layer, FR-4 with 2 oz copper weight

• Flexible footprints for different caps size/lead space

• Dimension: 74 x 71 mm

• Assembled Boards and Tested Available

• Dale 1%, 0.5 W low-noise metal-film resistors

• WIMA MKP film caps

• MUSE electrolytic cap

• Silver mica compensation cap

• Precision multi-turn trimmer

    Rev1.4 Schematic Now Available

    App Note 101 Now Available

    Component list for  LME49180

    Component list for LME49811

    Component list for LME49830

Universal Power Board for Two-Pair Output Devices

• Accommodates ThermalTrak, 3-Lead TO-264 and Sanken MT-200 Power Transistors

• Onboard Reservoir Caps

• Output Coil and Zobel Network Added

• Two-layer FR-4 with 2-oz copper, gold plated

•  Accommodates separate supply rails for driver board (LME498xx)

• Dimension: 163 mm x 96 mm

• Assembled and Tested boards Available

• Two-pair matched ON Semi NJL3281/1302 or matched Sanken 2SC3624/A1925 power BJTs

• Dale 1%, 0.5 W low-noise metal-film resistors

• WIMA MKP film caps

• Matched non-inductive emitter resistors (0.22 Ohms, 5 W x 2 per emitter leg)

• Rubycon 10,000 uF, 50 V  or ELAN 10,000 uF, 80 V Audio Grade electrolytic caps

Component list for ThermalTrak power BJTs

Component list for non-ThermalTrak power BJTs

• Triple Emitter Follower Output Topology

• Work for LME49810 and LM49811

• Two-layer FR-4 board with 2-oz copper, Gold Plated

• Wide Copper Tracks for High-Current Handling

• Symmetry Layout Eliminating Induction Interference

• Dimension: 160 mm x 77 mm

Rev 2.0 component available

  Power Board for ON Semi ThermalTrak™ Transistors

OUT OF STOCK

Rev 2.2 schematic now available

                               Component list for reference

• Emitter-follower output stage with driver

• Two-layer FR-4 board with 2 oz copper weight, Gold Plated

• Designed for ON Semi ThermalTrak transistors TO-264, 5-Lead packages such as NJL3281D/1302D and NJL4281D.4302D

• Onboard electrolytic filtering caps

• WIMA/BC decoupling caps

• Low inductance 0.22 Ω, 5 W resistors

  Power Board for 3-Lead BJT/MOSFET Power Transistors

OUT OF STOCK

Rev 3.2 BJT schematic now available

Rev 3.2 MOSFET schematic now available

BJT component list for reference

MOSFET component list for reference

• Emitter-/Source-follower output stage with driver
• Two-layer FR-4 board with 2 oz copper weight, Gold Plated
• Designed for TO-264, 3-Lead packages such as IRF240/P240 and MJL21193/4
• Driver stage can be bypassed for using MOSFET transistors with  LME49830 driver board
• Onboard electrolytic filtering caps
• WIMA/BC decoupling caps
• Low inductance 0.22 Ω, 5 W resistors