39 lines
1.0 KiB
Markdown
39 lines
1.0 KiB
Markdown
---
|
|
id: task-2
|
|
title: Build One-Crystal Walkie-Talkie
|
|
status: To Do
|
|
assignee: []
|
|
created_date: '2026-01-05 23:03'
|
|
labels:
|
|
- hardware
|
|
- piezoelectric
|
|
- electronics
|
|
dependencies: []
|
|
priority: medium
|
|
---
|
|
|
|
## Description
|
|
|
|
<!-- SECTION:DESCRIPTION:BEGIN -->
|
|
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.
|
|
<!-- SECTION:DESCRIPTION:END -->
|
|
|
|
## Acceptance Criteria
|
|
<!-- AC:BEGIN -->
|
|
- [ ] #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
|
|
<!-- AC:END -->
|