Telephone Hold Button
Electronic Schematics > Telephone related > 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.

Title: Telephone Hold Button
electronic circuit
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 317
Print version: Print version

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Electronic circuits > Telephone related > Telephone Hold Button