PROJECTS: MINI CHIP AMP
5d. Carefully place the assembled electronics into the A/B
assembly. Secure the input switch and volume control to the
front of A with nuts. Install the volume knob. Install the three
#4 screws that hold the input panel to B, and nut them on
5e. Slide part C between the transformer and part B. Install the power switch in part C. From the back,
pass a #8×½" screw through the transformer mounting hole, parts C and B, and the input panel. Pass
#8×½" screws through the P-clip holding the power cord, the transformer mounting hole, and parts C and
B on the speaker side. Nut these 3 screws on the inside, trapping the PCB ground wire lug under one nut
to ground the PCB to the chassis.
5f. Screw down the LM1875 chips with #6 nylon screws from
below and metal nuts on top. Don’t use metal screws. The chip
tabs must be electrically insulated from the chassis.
5g. Connect the speaker ground leads from the PCB to the black
speaker terminals. Connect the speaker signal leads to the red
speaker terminals, right to lower and left to upper.
5h. Drop the plexiglass side panels in place in rails D. They’re left loose for airflow.
5i. With washers, pass the #8× 3½" screws through the upper corner holes in parts C, B, and A from the
back. Install washers and acorn nuts on them at the front. Slide one rail E over the long screw from the
side. Tighten the nut on the screw to hold the E rail in place. Slide one end of the plexi top into the E rail.
Slide the E rail over the other end and tighten the long screw’s nut to hold it in place.
5j. You're done. Hook it up and take it for a spin!
82 Make: Volume
NOW GO USE IT »