Schematics > Telephone related > Telephone Hold Button
Telephone Hold ButtonAlthough 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
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
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 122
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