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

R1__________1.5K 1/4 W Resistor
R2__________1K 1/4W Resistor
D1__________1N4002 Silicon Diode
SCR1________C106Y SCR
LED1________Red LED
S1__________Normally Open Push-Button Switch
MISC________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.