Telephone Hold Button
Category: Main page » 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 powered by the phone line itself, eliminating the need for batteries.

Schematic


This is the schematic of the Phone Hold Button

Parts


Part

Total Qty.

Description

Substitutions

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.


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