LDA DMx DiY dual mono audio amplifier kit assembly instructions
General assembly advice
It is the sole responsibility of the builder to ensure that the equipment complies with the electrical safety requirements. The use of wooden and plastic boxes is not recommended due to the risk of fire.
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
PSS701c/PSS702c assembly instructions
APBFa/APBMa assembly instructions or DPBsc assembly instructions
MID2/MID2A assembly instructions
Connection scheme
Click below for the connection scheme:
Mark the two LDA17 boards "1" and "2". Do the same for the two ABPF/APBM/DPB 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 |
wire min. 0,75 mm2 |
|
J96(PGND) |
J13(PGND) |
solder - solder |
wire min. 0,35 mm2 |
|
J97(ZGND) |
J11(ZGND) |
solder - solder |
wire min. 0,35 mm2 |
|
J98(GND) |
J3(GND) |
solder - solder |
wire min. 0,25 mm2 |
|
J95(-VCC) |
J12(-VCC) |
solder - solder |
wire min. 0,75 mm2 |
|
J102(RLYIN) |
J10(AOUT) |
solder - solder |
wire min. 0,75 mm2 |
MID2(A) - PSS701/PSS702
|
MID2(A) |
PSS701/PSS702 |
Connection type |
Remarks |
|
J86,J87(SV_1, SV_2)* |
J103(12VDC) |
connector - solder |
wires min. 0,25 mm2 |
* Connect the J86 (SV_1) to the PSS701/PSS702 marked "1" and connect J87 (SV_2) to the PSS701/PSS702 marked "2".
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 |
LDA17 - DPB
|
LDA17 |
DPB |
Connection type |
Remarks |
|
+ER(J5/J7), -ER(J6/J8) |
J52(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 |
PSS701/PSS702 - DPB
|
PSS701/PSS702 |
DPB |
Connection type |
Remarks |
|
J92(PROT) |
J54(PROT) |
connector - connector |
observe polarity when assembling connector |