Telephone electronic circuits ေလ့လာလုိသူမ်ားအတြက္

Telephone electronic circuits list :

1. Telephone Ringer using 556 dual timers
3. Two line intercom plus a telephone changeover switch
4. Telephone line based audio muting and light on circuit
5. Having secrecy in parallel telephones
6. Telephone call meter using calculator & COB
7. Phone Broadcaster
8. Conversation Recorder
9. Multipurpose Circuit for telephone
10. Remote control using telephone
11. Cordless phone backup
12. Telephone Number Display
13. Smart Phone light
14. Telephone Headgear
15. Telephone Line Vigilant
16. Audio Visual Ringer
17. Off line Telephone tester
18. The Link Telephone Intercom ? Every Home Should Have One!