LDA 53DM_np DiY dual mono audio amplifier kit assembly instructions

General assembly advice

- recommended unloaded power supply voltage (for 200W per 4 ohms power / channel): +/- 52...54V

- recommended transformers (for 2x200W per 4 ohms power): two pieces of 300VA transformers with 2x38...2x40VAC secondary voltage

- a suitable chassis that includes external heatsinks: Dissipante 4U (e.g. with deluxe-style faceplate) or Deluxe 4U (see diyaudiostore.com) -- not supplied within this kit.

Here's a possible positioning of the boards within the Dissipante 4U or Deluxe 4U chassis:

Assembly instructions of kit components

LDA172hc assembly instructions

PSSR350c assembly instructions

APBFa and APBMa assembly instructions

MIB12dc assembly instructions

List of connections between boards

Mark the two LDA172 boards "1" and "2". Do the same for the two ABPF/APBM boards and the two PSSR350 boards. Always connect boards marked "1" together and connect boards marked "2" together. Do not mix up connections between boards marked "1" with those marked "2".

PSSR350 - LDA172

PSSR350

LDA172

Connection type

Remarks

J93(+VCC)

J9(+VCC)

solder - solder

cable min. 0,75 mm2

J94(PGND)

J13(PGND)

solder - solder

cable min. 0,35 mm2

J95(ZGND)

J11(ZGND)

solder - solder

cable min. 0,35 mm2

J96(GND)

J3(GND)

solder - solder

cable min. 0,25 mm2

J97(-VCC)

J12(-VCC)

solder - solder

cable min. 0,75 mm2

J102(AOUT)

J10(AOUT)

solder - solder

cable min. 0,75 mm2

MIB12 - PSSR350

MIB12

PSSR350

Connection type

Remarks

J84/J85

J103(12VDC)

solder - connector

cables min. 0,25 mm2

LDA172 - APBF/APBM

LDA172

APBF/APBM

Connection type

Remarks

+ER(J5/J7), -ER(J6/J8)

J51(ERV)

solder - connector

observe +/- polarity;

see LDA172 assy instructions

PSSR350 - APBF/APBM

PSSR350

APBF/APBM

Connection type

Remarks

J92(PROT)

J53(PROT)

connector - connector

observe polarity when assembling connector

 

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