Telephone Control | Electronic Project Circuits

Posts Tagged ‘telephone control’

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 powered by the phone line itself, eliminating the need for batteries.

Parts
R1 1 1.5K 1/4 W Resistor
R2 1 1K 1/4W Resistor
D1 1 1N4002 Silicon Diode 1N4003, 1N4004, 1N4005, 1N4006, 1N4007
SCR1 1 C106Y SCR
LED1 1 Red LED Green LED, Yellow LED
S1 1 Normally Open Push-Button Switch
MISC 1 Wire, Board, Case (If Used)

Notes
1. To place a call on hold, simply hold down the button while hanging up the phone. To take a call off hold, just pick up the phone, or any extension.
2. Even though this is a simple circuit, you may have to check with your phone company before use.

Be the first to comment - What do you think? Posted by admin - September 28, 2010 at 4:58 pm

Categories: Basic electronics, Telephone Tags: indicator telephone, telephone control, telephone hold circuits

Extension Phone Line Switcher by SCR 2N5061

Having multiple extension telephones at home is very convenient. You can make or receive phone calls practically anywhere in the house. This circuit disables other telephones connected to the phone line whenever a telephone (either the master or any extension phone) is in use. The circuit is inexpensive and is guaranteed to keep the phone conversation private. The circuit does not need an external power supply. It gets its power from the telephone line.

Read more original source:http://www.electronicsforu.com/efylinux/circuit/cir45.htm

Be the first to comment - What do you think? Posted by admin - July 14, 2008 at 9:03 am

Categories: Electronic Control, Telephone Tags: circuit SCR, circuit switches, telephone control

Phone Line Controller by PIC16F84

It might be “yet another” Â«deviceÂ» controller that operates over phone-line, but this one works for sure The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected Â«consumerÂ» is turned-on or off and report to the administrator at the other end of the phone line. The administrator would then call-in the device, log in with the password, and check the state of Â«consumerÂ», turn it on or off, change password or some other settings. Current version has only one relay.