| Author | Message | ||
     Uknown User Unregistered guest |
Dear Simon, I been curently studing telphones and radio waves. And sense i do not have a oscilator i just want to make a wire telephone line. But unfortuanatly i need help. Maybe you can help me out with some diagrams or plans? Well thankz and If anybody would like to submitt their ideas if read this feel free!! | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 456 Registered: 12-2004 |
A simple wire telephone is simply two speakers wired together. If you shout into one, someone can hear your voice in the other. An improvement is to have the receiver use a piezoelectric earphone. A further improvement is to have the receiver use an audio transformer and a piezoelectric earphone. Connect the 8 ohm side to the speaker, the two long wires to the 1,000 ohm side, and the piezoelectric earphone to the other end of the two long wires. You can also use two regular telephones and a 9 volt battery. Each phone has two wires coming from it (the red and the green). Connect the red wires from phone to phone. Connect the green wire from each phone to a different terminal of the battery. If both phones are off the hook at the same time, you can talk, just like on a phone connected to the phone company. | ||
| Uknown! Unregistered guest |
THANKS! | ||
| Anonymous |
WAIT??!! HELP!!! CAN U PLEASE DRAW IT OUT! THANKS! | ||
| Angus Chalmers (Fungus) Intermediate Member Username: Fungus Post Number: 31 Registered: 12-2005 |
I tried connecting the phones together like you said but it only works one-way. What do you think I have done wrong? | ||
| Trevor (Hendrix00) Intermediate Member Username: Hendrix00 Post Number: 25 Registered: 7-2005 |
re- check the wires and the battery | ||
| Troy (Pharoah) Member Username: Pharoah Post Number: 14 Registered: 3-2006 |
I had to add another 9v battery and a 680 ohm resistor to get this to work properly |
