Re: HowTo Wire Radio Speakers to Audio-In on TV-VCR Combo
- From: Don Bowey <dbowey@xxxxxxxxxxx>
- Date: Thu, 30 Aug 2007 16:45:50 -0700
On 8/30/07 1:25 PM, in article 46d727bd$0$18914$4c368faf@xxxxxxxxxxxxxx,
"911 Was An Inside Job" <nobody@xxxxxxxxxxx> wrote:
Hello Don,
Thanks for your time and your sage advice. Take a look at the images of the
board for the radio and let me know what you may make of them per the
following...
If your AM radio uses an audio output transformer, find the connections
from
it to the speaker, and see if both wires go directly to the speaker. If
they don't then one of them is probably connected to the systems "common"
somewhere. Connect it to the shell of your male RCA jack. If one is not
connected to common, connect it to the shell of your male RCA jack.
//SpeakerWire
http://metromilwaukee.com/images/radio/speakerwire.jpg
//ObliqueView
http://metromilwaukee.com/images/radio/obliqueview.jpg
//TopView
http://metromilwaukee.com/images/radio/topview.jpg
<%= Clinton
"Don Bowey" <dbowey@xxxxxxxxxxx> wrote in message
news:C2FC4E42.7570A%dbowey@xxxxxxxxxxxxxx
On 8/30/07 9:42 AM, in article 46d6f389$0$19607$4c368faf@xxxxxxxxxxxxxx,
"911 Was An Inside Job" <nobody@xxxxxxxxxxx> wrote:
"clintonG" <nobody@xxxxxxxxxxx> wrote in message
news:46d6e83e$0$18948$4c368faf@xxxxxxxxxxxxxxxxx
I like to record the Coast To Coast AM radio program which airs on local
radio from 12am to 5am nightly. I have a TV-VCR combo that will support
recording an external source.
In the front of the TV-VCR there are two female RCA [1] inputs, one
input
labeled Video and the other input labeled Audio. In the rear of the
TV-VCR
there are -- two pairs -- of RCA inputs, one pair labeled Audio in and
Audio
out and the other pair labeled Audio in and Audio out.
I know I can set the TV-VCR to Line 1 to record input from an external
device. Can somebody help explain to me how to wire the speakers
(output)
of
an AM radio to interface with the TV-VCR to enable recording radio
programming (input) to the VCR?
<%= clintonG
[1] http://en.wikipedia.org/wiki/RCA_connector
Okay searching the web I just learned the speaker wires transmit power
and
not a 1:1 audio signal as I ignorantly presumed.
The speaker wires carry an audio signal (an AC voltage) to a low impedance
speaker (probably about 8 Ohms). The speaker impedance (similar to, but
more complex than resistance) presents a load on the voltage, producing a
current flow in the speaker wires. The product of the voltage and current
is power.
Forum discussions say I
must use an amplifier inline i.e. AM radio speaker wires -->
amplifier -->
TV-VCR Audio In.
Your forum discussion group is, in my experience, wrong on this one
I don't really understand how power can become audio when amplified
You should discard this idea. Further study, if wanted, will explain the
conditions much better.
but if
that's all that it is I know I am using an older table top AM-FM radio
which
will need to have an amplifier to record the radio's audio using the
TV-VCR.
No external amplifier is needed.
Your recorder's audio input has a very high impedance, which means the
signal audio voltage will drive it easily.
If your AM radio uses an audio output transformer, find the connections
from
it to the speaker, and see if both wires go directly to the speaker. If
they don't then one of them is probably connected to the systems "common"
somewhere. Connect it to the shell of your male RCA jack. If one is not
connected to common, connect it to the shell of your male RCA jack.
Connect one end of a low power, 100,000 Ohm resistor (radio shack?) to the
other speaker wire. Connect the other end of the resistor to the center
pin
of the RCA jack.
Turn the radio volume down low, and plug the RCA jack into the audio input
of your recorder. While recording, turn the radio volume up to a usable
level.
So what might be your recommendation for the least expensive amplifier?
I'll
be calling Radio Shack to learn what may be learned. Thanks for your
time...
<%= clintonG
I can't tell if the transformer shown is a power transformer or an audio
output transformer. If you can't trace the wire by eye, or check it with an
Ohmmeter....... Hmmm!
Do you have a Volt/Ohmmeter? If yes, then first measure for voltage (AC and
DC) between the outer shell of the audio input jack, and each of the radio
speaker wires. If there is no voltage, then measure for resistance between
the same points. If there is no voltage and no continuity (n low
resistance) then it doesn't matter which wire goes where.
Otherwise..... Do you have a soldering iron?
.
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- From: clintonG
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- From: 911 Was An Inside Job
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