in english
in-russian
AM-FM Transmitters and Bugs
 

Electronic circuits, devices for phones

  1. Cellular Phone calling Detector
  2. Phone line indicator
  3. Phone "Hold" With Music
  4. Soft Musical Telephone Ringer
  5. Telephone amplifier
  6. Cut Phone Line Detector
  7. Telephone line monitor
  8. Phone Busy Indicator
  9. Phone In Use Indicator
  10. Phone In Use Indicator-2
  11. Ringing Phone Light Flasher
  12. Simple Phone Tap
  13. Telephone Hold Button
  14. Telephone recorder
  15. Telephone Record Control
  16. The Link Telephone Intercom – Every Home Should Have One!
  17. The Link A2B+1 (the Link Telephone Intercom - DTMF version)
  18. The Link 4+0 – Internal Intercom
  19. The Original 2 Phone Link Design

Other:

  1. Intercommunication (Intercom)
  2. Intercom
  3. High Quality Intercom
  4. Cellular Phone calling Detector
  5. Low cost intercom using transistors
  6. Infrared Head Phones
  7. Audio Visual Indicator for Telephones
  8. Cordless phone backup
  9. Smart Phone light
  10. Off line Telephone tester
  11. Isolated Telephone Interface
  12. Voice Scrambler
  13. Voice Record / Playback Circuit
  14. Simple speakerphone
1999-2010. cxem.net. All right reserved!