| Author | Message | | | eric | | Posted: Mon Aug 28, 2006 12:20 pm Post subject: Turn That Down, Please | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | A. Baur
Many people, both at home and at work, like to have the radio
on for some background music or news. Your preferred sound
volume, however, may well be annoying when a phone call
has to be made or answered. This little circuit keeps music
lovers and phone addicts happy at the same time by automatically
reducing the music volume when the phone is taken
off the hook. No need to walk over to the radio!
The circuit is simple and built from off the shelf components.
As long as the receiver is on the hook, the phone line voltage
will be high, causing the optocoupler to conduct and the
relay to remain off. Via the relay
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