LDA DMx DiY dual mono audio amplifier kit assembly instructions

General assembly advice

Recommended transformers: See 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 400VA (200VA per channel).

A suitable chassis that includes external heatsinks: Dissipante 2U for LDA DM1 and Dissipante 4U for LDA DM2 (see modushop.biz or diyaudiostore.com) -- not supplied within this kit.

Click below for a possible positioning of the boards within the above chassis:

Assembly instructions of kit components

LDA17 assembly instructions

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 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

PSS701/PSS702 - LDA17

PSS701/PSS702

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 - PSS701/PSS702

"MI12"

PSS701/PSS702

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 LDA17 assy instructions

PSS701/PSS702 - APBF/APBM

PSS701/PSS702

APBF/APBM

Connection type

Remarks

J92(PROT)

J53(PROT)

connector - connector

observe polarity when assembling connector

 

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