telephone status indicator

this will monitor telephone status without loading the telephone line, this way if you have two phones in parallel you will know if one of them is busy. connect the two ends of circuit in parallel to phone lines.

Read more Source:

http://schematics.blogspot.com/2004/10/telephone-status-indicator.html

Thank you.

Telephone Amplifier by LF351+TBA820M
circuit Telephone Amplifier by LF351+TBA820M If phone your light exceedingly ring. Invite come to this way. I thinks this circuit can help. It is Telephone Amplifier circuit. By have pillar equipment be IC LF351 perform enlarge telephone signal from pick up give the power goes up. Be ...
Circuit Telephone Ringer by IC KA2411
If you feel to are bored with with the phone ring as a result try use this Telephone Ringer by IC KA2411 circuit. It will may help to give testimony is lost can is bored with, because have a voice sweet-sounding good music use IC KA2411(IS A BIPOLAR INTEGRATED CIRCUIT DESIGNED FOR TELEPHONE ...
Telephone Hold Button
Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful. It is easy to build, and is compact enough to be installed inside the phone with no real problem. It is also powere ...
Telephone Record Control
This circuit will allow you to connect any tape recorder that has a mic and remote input to a phone line and automatically record both sides of a conversation when ever the phone is in use. You will need to take a couple of voltage readings before connecting the circuit. First determine ...
DTMF Decoder by MT8870
Uses MT8870 DTMF decoder and PIC microcontroller to decode telephone tones Read more original source: http://www.pira.cz/dtmfdec.htm Related Links DTMF Decoder Decoder circuits Telephone circuit diagram More circuit about Tone-Decoder Circuit Telephone Ringer by IC KA2411 Telep ...