jeffemmett
/
crystal-radio
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
crystal-radio/backlog/tasks/task-2 - Build-One-Crystal-...

1.0 KiB
Raw Permalink Blame History

id title status assignee created_date labels dependencies priority
task-2 Build One-Crystal Walkie-Talkie To Do
2026-01-05 23:03
hardware
piezoelectric
electronics
medium

Description

Build the half-duplex walkie-talkie that uses a SINGLE piezo crystal as both microphone AND speaker. Press PTT to talk, release to listen - demonstrating the ultimate reversibility of piezoelectricity.

Key components:

  • LM386 amplifier
  • DPDT momentary switch (PTT)
  • Single piezo disc per unit
  • 9V battery power

Refer to piezoelectric-circuits-guide.md Build 4 section.

Acceptance Criteria

  • #1 Source LM386 chips and support components
  • #2 Acquire DPDT momentary switches for PTT
  • #3 Build amplifier circuit on breadboard/perfboard
  • #4 Wire PTT switching logic
  • #5 Build enclosures (Altoids tins work great)
  • #6 Test two-unit communication
  • #7 Add TX indicator LED