LDA 53DM_np 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 transformers' power 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.
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 or PSS701c/PSS702c assembly instructions
APBFa/APBMa 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 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".
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 |
PSS701/PSS702 - LDA172
|
PSS701 |
LDA172 |
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 |
MIB12 - PSSR350/PSS701/PSS702
|
MIB12 |
PSSR350/PSS701 |
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/PSS701/PSS702 - APBF/APBM
|
PSSR350/PSS701 |
APBF/APBM |
Connection type |
Remarks |
|
J92(PROT) |
J53(PROT) |
connector - connector |
observe polarity when assembling connector |