### 8PAKAMP & 12PAKAMP KIT BUILD THREAD

Posted:

**Tue Mar 20, 2012 6:02 pm**8PAKAMP kit is a 8 channel version of our popular 60W AMP kit. We originally designed the 8PAKAMP for a large Dolby Labs project we did a while ago.

8PAKAMP PCB measures 184mm x 81mm

1 x JLM 8PAKAMP PCB

8 x LM3886TF POWER AMP IC

16 x 1000uF 50v 105 degree caps (12.5 to 13mm diameter can only will fit PCB)

8 x 100uF 35v 105 degreee cap

16 x 10uF 25v Bi Polar cap

16 x 100nF Mono caps (100nF = 104)

88 x 10k

8 x 1k

8 x 10mm x 3mm bolt

8 x 3mm nut

8 x 3mm lock washer

8 x 10k trim pot 25turn screw on top type

No Terminals

or

8 x TRS S4 PCB jacks

16 x fibre washer

8 x black plastic trim

8 x chrome nuts

or

8 x XLR Male

- 8 x 75Watts of power configurable for making active monitors or full surround sound amp setups in lots of combinations on 184mm x 81mm PCB

(eg 4 x 140watt bridged, 2 x 280watt bridged, 1 x 560watt bridged, 1 x 280watt bridged + 1 x 140watt bridged + 2 x 75watt. etc)

2 x 8000uF 50v capacitor power rail smoothing banks on board PCB. So only power transformer, Bridge rectifier and heatsink needed to complete full 8 channel amp.

Fully balanced inputs to all amps (can be wired unbalanced in by shorting either +in or -in to 0v depending on amp phase needed)

Amp level setting trims on all channels. Can be fitted under the PCB for external front panel trimming or on top of PCB for internal trimming.

Inputs can be PCB XLR or TRS sockets or hard wire

Amp IC's can be fitted flat under PCB or vertical standing on top of PCB for different heatsink setups.

PCB can be run by 25 to 35Amp bridge rectifier and transformer of 300 to 500VA with 2 x 25vac to make +/-35vdc if no amps are bridged or 2 x 18vac to make +/-25vdc if any amps are bridged.

Bridging is easily done by wiring two amp inputs together but with the second amp +in and -in are swapped to reverse its phase

**The LM3886 when mounted underneath should be placed flat on the bottom of PCB and 2 x flat 3mm washer or 3 x 3mm lock washer inserted in the gap between the PCB hole and mounting tab hole to pack the gap.**8PAKAMP PCB measures 184mm x 81mm

**JLM 8PAKAMP PCB PARTS KIT**1 x JLM 8PAKAMP PCB

8 x LM3886TF POWER AMP IC

16 x 1000uF 50v 105 degree caps (12.5 to 13mm diameter can only will fit PCB)

8 x 100uF 35v 105 degreee cap

16 x 10uF 25v Bi Polar cap

16 x 100nF Mono caps (100nF = 104)

88 x 10k

8 x 1k

8 x 10mm x 3mm bolt

8 x 3mm nut

8 x 3mm lock washer

8 x 10k trim pot 25turn screw on top type

**Options**No Terminals

or

8 x TRS S4 PCB jacks

16 x fibre washer

8 x black plastic trim

8 x chrome nuts

or

8 x XLR Male