LDA DMx DiY dual mono audio amplifier kit assembly instructions

General assembly advice

Recommended transformers: See PSSR350c or PSS701c/PSS702c assembly instructions.

Separate ON/OFF switches are required for the two channels, if the total of the power of the transformers exceeds about 350VA (175VA per channel).

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.

Click below for a possible positioning of the boards within the Dissipante 4U or Deluxe 4U chassis:

Assembly instructions of kit components

LDA17 assembly instructions

PSSR350c assembly instructions or PSS701c/PSS702c assembly instructions

APBFa/APBMa assembly instructions

The "MI12" PCB is not supplied with the kit, you should make it yourself, but here is a suggestion.

Connection scheme

Click below for the connection scheme:

Mark the two LDA17 boards "1" and "2". Do the same for the two ABPF/APBM/APB boards and for the two PSSR350/PSS701/PSS702 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".

List of connections between boards

PSSR350 - LDA17

PSSR350

LDA17

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

PSS701/PSS702 - LDA17

PSS701

LDA17

Connection type

Remarks

J94(+VCC)

J9(+VCC)

solder - solder

cable min. 0,75 mm2

J96(PGND)

J13(PGND)

solder - solder

cable min. 0,35 mm2

J97(ZGND)

J11(ZGND)

solder - solder

cable min. 0,35 mm2

J98(GND)

J3(GND)

solder - solder

cable min. 0,25 mm2

J95(-VCC)

J12(-VCC)

solder - solder

cable min. 0,75 mm2

J102(RLYIN)

J10(AOUT)

solder - solder

cable min. 0,75 mm2

+12 VDC, GND - PSSR350/PSS701/PSS702


PSSR350/PSS701

Connection type

Remarks

+12 VDC, GND

J103(12VDC)

solder - connector

cables min. 0,25 mm2

LDA17 - APBF/APBM

LDA17

APBF/APBM

Connection type

Remarks

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

J51(ERV)

solder - connector

observe +/- polarity;

see LDA172 assy instructions

PSSR350/PSS701/PSS702 - APBF/APBM

PSSR350/PSS701

APBF/APBM

Connection type

Remarks

J92(PROT)

J53(PROT)

connector - connector

observe polarity when assembling connector

 

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