Project Start

flux

To finalize J3/J4 safely, perform the rear silkscreen test on each speaker:
  1. Disconnect the speaker from the amplifier.
  2. Momentarily connect a 1.5 V cell with battery + to JST pin 1 and battery − to pin 2.
  3. Observe cone motion:
    • Cone moves outward: JST pin 1 = SPK+
    • Cone moves inward: JST pin 1 = SPK−
  4. Repeat for the other speaker and report the result for each:
    Left: outward/inward and Right: outward/inward.
I’ll then assign J3/J4 labels and differential audio nets so both speakers are in phase.
raffaelemontella

raffaelemontella

Left: outward. Right: outward, with + applied to JST pin 1 on both speakers.

flux

Confirmed: JST pin 1 is SPK+ and pin 2 is SPK− for both speakers. I’ll finalize the left/right connector nets and rear labels accordingly, then verify stereo phase consistency.
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PRG32 PCB

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