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Piezoelectric crystal circuits: telephones, walkie-talkies, and homegrown crystals
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Jeff Emmett 33c3d24838 Initial commit: Piezoelectric circuits guide and backlog tasks 
Add comprehensive guide covering:
- Zero-power crystal telephone (two piezos, no batteries)
- Amplified version with LM386
- Full-duplex intercom
- One-crystal walkie-talkie with PTT switching
- Rochelle salt crystal growing instructions
- Physics explanations and demonstration scripts

Backlog tasks created:
- task-1: Build Unpowered Crystal Telephone (high priority)
- task-2: Build One-Crystal Walkie-Talkie (medium priority)
- task-3: Grow Rochelle Salt Piezoelectric Crystals (medium priority)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 		2026-01-06 00:03:42 +01:00
backlog Initial commit: Piezoelectric circuits guide and backlog tasks 2026-01-06 00:03:42 +01:00
piezoelectric-circuits-guide.md Initial commit: Piezoelectric circuits guide and backlog tasks 2026-01-06 00:03:42 +01:00