Schematics > Telephone related > Phone "Hold" With Music
Phone "Hold" With Music
This circuit will allow you to place a phone call on hold and if you wish to
have them listen to music while they are on hold. The circuit operates as
follows: The RED wire from the phone jack is typically positive and the GREEN
wire is negative or ground. When you want to place a call on hold, close S1 and
hang up the handset. The resistor R1 simulates another phone off hook and allows
enough
current to pass through to prevent the phone company from disconnecting the
call. The resistor R2 and LED provide a visual indication that you have someone
on hold ( this is optional )
The capacitor C1 and the transformer provide the interface to a radio or CD
player headphone jack. Before you hook up the project to the phone line you must
determine the polarity of the line. Place a voltmeter across the red and green
wires of the telephone line, there should be about 48 volts
DC positive when the black lead of your meter is connected to the green phone
wire. If it is negative 48 volts then reverse the wires.
Title: Phone "Hold" With Music
Source: www.electronics-lab.com
Published on: 2005-02-10
Reads: 311
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