Two radios, One speaker

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wheelman

Member - Posts: 6

Joined: November 13, 2004

Location: United States

Posted: November 27, 2004 at 9:46 PM / IP Logged

Howdy,

I have an Yaesu FT-7800 (2-way radio) and a Uniden BCT8 (scanner) in my car. I also have a Motorola extension speaker. I would like to use the speaker for both radios. I am wondering if I should isolate the speaker outputs for the two radios, or if I could just hook them together and then to the speaker.

Thanks in advance.

JJ

Hang on boys... we're going in hot!

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 28, 2004 at 12:24 AM / IP Logged

It would be better to use an Isolation Transformer to hook them together.

You can find one in a good RCA adaptor that converts a Stereo to RCA

Just rewire it for your project.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 28, 2004 at 1:10 AM / IP Logged

Here is the RCA adaptor I am talking about.

Two radios, One speaker - Last Post -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 28, 2004 at 1:28 AM / IP Logged

Here is your final circuit

Two radios, One speaker - Last Post -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 28, 2004 at 2:09 AM / IP Logged

You could use the RCA Adaptor to make the Audio at low level, Then you could Use an Audio Mixer Circuit then send it to one Amplifier.

Two radios, One speaker - Last Post -- posted image.

http://www.electronics-lab.com/projects/audio/034/ Two radios, One speaker - Last Post -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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rknj01

Copper - Posts: 59

Joined: March 08, 2004

Location: United States

Posted: November 28, 2004 at 2:18 AM / IP Logged

i would just use 2 relays

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 28, 2004 at 2:23 AM / IP Logged

rknj01 wrote:

i would just use 2 relays

He wants to hear both at the same time thru one speaker.

How would a relay do the job?

We don't want the output of one Radio to Feed into the output of the other because it could blow the Audio amplifier. So you have to Isolate the two from eachother then combine them into one.

The simple solution would be to use a small Dual Voice coil Speaker or a second speaker.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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Two radios, One speaker

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