Telephone related electronic circuits and electronic schematics
Telephone amplifier, Smart Phone light, Conversation Recorder, Simple Phone Tap...
- Audio Visual Ringer
- Conversation Recorder
- Cordless phone backup
- Cut Phone Line Detector
- Detector of cellular phone incoming call
- FM Telephone Bug
- Having secrecy in parallel telephones
- Multipurpose Circuit for telephone
- Off line Telephone tester
- Phone "Hold" With Music
- Phone Broadcaster
- Phone Busy Indicator
- Phone line indicator
- Ringing Phone Light Flasher
- Simple Phone Tap
- Smart Phone light
- Soft Musical Telephone Ringer
- Telephone amplifier
- Telephone Audio Interface
- Telephone call meter using calculator & COB
- Telephone Headgear
- Telephone Hold Button
- Telephone line based audio muting and light on circuit
- Telephone line monitor
- Telephone Line Vigilant
- Telephone Number Display
- Telephone Ringer using 556 dual timers
- The Link 4+0 – Internal Intercom
- The Link A2B+1 (the Link Telephone Intercom - DTMF version)
- The Link Telephone Intercom – Every Home Should Have One!
- The Original 2 Phone Link Design
- Two line intercom plus a telephone changeover switch
Total in category: 32