Schematic For Recotron Wireless Speakers?

D

Doug White

Guest
These things were also sold under the Advent and Radio Shack name. They
run on 900 MHz. I have the owner's manual, but it doesn't include any
repair info. I actually want to bypass RF and just use them as battery
powered speakers. I'm sure I could trace it out, but it would be easier if
I had a schematic, and I'm curious about the inner workings of the RF as
well.

Thanks!

Doug White
 
Doug White wrote:
These things were also sold under the Advent and Radio Shack name. They
run on 900 MHz. I have the owner's manual, but it doesn't include any
repair info. I actually want to bypass RF and just use them as battery
powered speakers. I'm sure I could trace it out, but it would be easier if
I had a schematic, and I'm curious about the inner workings of the RF as
well.
Click to expand...

Do they have volume controls? If so, you may be able to connect the
audio across the pot. That is, if it is an analog circuit. If not,
you'll have to find the datasheets for the ICs and draw your own
circuit.


--
You can't have a sense of humor, if you have no sense.
 
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:tZSdnXJtHfgz39fSnZ2dnUVZ_jSdnZ2d@earthlink.com:

Doug White wrote:

These things were also sold under the Advent and Radio Shack name.
They run on 900 MHz. I have the owner's manual, but it doesn't
include any repair info. I actually want to bypass RF and just use
them as battery powered speakers. I'm sure I could trace it out, but
it would be easier if I had a schematic, and I'm curious about the
inner workings of the RF as well.


Do they have volume controls? If so, you may be able to connect
the
audio across the pot. That is, if it is an analog circuit. If not,
you'll have to find the datasheets for the ICs and draw your own
circuit.
Click to expand...
They do have a volume control, but how useful that is depends on where
they put it in the food chain. Certainly worth a look if I can't scare
anything up.

Recoton also has a large number of patents, and I thought I might get
lucky with one of those. Unfortunately, a lot of them are unrelated, and
none of them include any detailed schematics (sometimes they do). The
guy behind Recoton was Larry Schotz, who was pretty creative. I found
his original patent (4829570) for sending the audio over the power lines
(I had those speakers a long time ago as well). No real info on the 900
MHz FM wireless speakers. I may just have to open one up & try to sort
it all out. If he used a commercial FM decodeer chip, there may be a
clean spot where I can tap into the lines comming out of that. There is
also a left/right/mono selector switch that would be a likely spot to
inject the audio.

Doug White
 
On Feb 26, 9:05 am, Doug White <gwh...@alum.mit.edu> wrote:
"Michael A. Terrell" <mike.terr...@earthlink.net> wrote innews:tZSdnXJtHfgz39fSnZ2dnUVZ_jSdnZ2d@earthlink.com:







Doug White wrote:

These things were also sold under the Advent and Radio Shack name.
They run on 900 MHz.  I have the owner's manual, but it doesn't
include any repair info.  I actually want to bypass RF and just use
them as battery powered speakers.  I'm sure I could trace it out, but
it would be easier if I had a schematic, and I'm curious about the
inner workings of the RF as well.

   Do they have volume controls?  If so, you may be able to connect
   the
audio across the pot.  That is, if it is an analog circuit.  If not,
you'll have to find the datasheets for the ICs and draw your own
circuit.

They do have a volume control, but how useful that is depends on where
they put it in the food chain. Certainly worth a look if I can't scare
anything up.

Recoton also has a large number of patents, and I thought I might get
lucky with one of those.  Unfortunately, a lot of them are unrelated, and
none of them include any detailed schematics (sometimes they do).  The
guy behind Recoton was Larry Schotz, who was pretty creative.  I found
his original patent (4829570) for sending the audio over the power lines
(I had those speakers a long time ago as well).  No real info on the 900
MHz FM wireless speakers.  I may just have to open one up & try to sort
it all out.  If he used a commercial FM decodeer chip, there may be a
clean spot where I can tap into the lines comming out of that.  There is
also a left/right/mono selector switch that would be a likely spot to
inject the audio.

Doug White- Hide quoted text -

- Show quoted text -
Click to expand...
Is there a patent number anywhere on the label???
 
On 26/02/2012 13:22, Doug White wrote:
These things were also sold under the Advent and Radio Shack name. They
run on 900 MHz. I have the owner's manual, but it doesn't include any
repair info. I actually want to bypass RF and just use them as battery
powered speakers. I'm sure I could trace it out, but it would be easier if
I had a schematic, and I'm curious about the inner workings of the RF as
well.
Click to expand...
FCC ID printed anywhere? As a wireless device, the whole thing could be
documented within the FCC's online database.

--
Adrian C
 
"hrhofmann@att.net" <hrhofmann@att.net> wrote in
news:6e2fc688-d09d-4f6b-a391-f473fd059443@b23g2000yqn.googlegroups.com:

On Feb 26, 9:05 am, Doug White <gwh...@alum.mit.edu> wrote:
"Michael A. Terrell" <mike.terr...@earthlink.net> wrote
innews:tZSdnXJtHf
gz39fSnZ2dnUVZ_jSdnZ2d@earthlink.com:







Doug White wrote:

These things were also sold under the Advent and Radio Shack name.
They run on 900 MHz.  I have the owner's manual, but it doesn't
include any repair info.  I actually want to bypass RF and just
use them as battery powered speakers.  I'm sure I could trace it
out, bu
t
it would be easier if I had a schematic, and I'm curious about the
inner workings of the RF as well.

   Do they have volume controls?  If so, you may be able to conne
ct
   the
audio across the pot.  That is, if it is an analog circuit.  If not
,
you'll have to find the datasheets for the ICs and draw your own
circuit.

They do have a volume control, but how useful that is depends on
where they put it in the food chain. Certainly worth a look if I
can't scare anything up.

Recoton also has a large number of patents, and I thought I might get
lucky with one of those.  Unfortunately, a lot of them are unrelated,
a
nd
none of them include any detailed schematics (sometimes they do).
 The guy behind Recoton was Larry Schotz, who was pretty creative.  I
found his original patent (4829570) for sending the audio over the
power lines (I had those speakers a long time ago as well).  No real
info on the 90
0
MHz FM wireless speakers.  I may just have to open one up & try to
sort it all out.  If he used a commercial FM decodeer chip, there may
be a clean spot where I can tap into the lines comming out of that.
 There i
s
also a left/right/mono selector switch that would be a likely spot to
inject the audio.

Doug White- Hide quoted text -

- Show quoted text -

Is there a patent number anywhere on the label???
Click to expand...
I checked both a speaker & the user manual. No luck.

Doug White
 
On Feb 26, 7:05 am, Doug White <gwh...@alum.mit.edu> wrote:
"Michael A. Terrell" <mike.terr...@earthlink.net> wrote innews:tZSdnXJtHfgz39fSnZ2dnUVZ_jSdnZ2d@earthlink.com:





Doug White wrote:

These things were also sold under the Advent and Radio Shack name.
They run on 900 MHz.  I have the owner's manual, but it doesn't
include any repair info.  I actually want to bypass RF and just use
them as battery powered speakers.  I'm sure I could trace it out, but
it would be easier if I had a schematic, and I'm curious about the
inner workings of the RF as well.

   Do they have volume controls?  If so, you may be able to connect
   the
audio across the pot.  That is, if it is an analog circuit.  If not,
you'll have to find the datasheets for the ICs and draw your own
circuit.

They do have a volume control, but how useful that is depends on where
they put it in the food chain. Certainly worth a look if I can't scare
anything up.

Recoton also has a large number of patents, and I thought I might get
lucky with one of those.  Unfortunately, a lot of them are unrelated, and
none of them include any detailed schematics (sometimes they do).  The
guy behind Recoton was Larry Schotz, who was pretty creative.  I found
his original patent (4829570) for sending the audio over the power lines
(I had those speakers a long time ago as well).  No real info on the 900
MHz FM wireless speakers.  I may just have to open one up & try to sort
it all out.  If he used a commercial FM decodeer chip, there may be a
clean spot where I can tap into the lines comming out of that.  There is
also a left/right/mono selector switch that would be a likely spot to
inject the audio.
Click to expand...
So are they analog or digital? One patent keeps the signal digital
until the very end.

I can't believe he got a patent for analog FM stereo transmission over
AC power lines -- that is an obvious combination of AM carrier current
plus FM stereo multiplex of thirty years previous.
 
Doug White wrote:
They do have a volume control, but how useful that is depends on where
they put it in the food chain. Certainly worth a look if I can't scare
anything up.

Recoton also has a large number of patents, and I thought I might get
lucky with one of those. Unfortunately, a lot of them are unrelated, and
none of them include any detailed schematics (sometimes they do). The
guy behind Recoton was Larry Schotz, who was pretty creative. I found
his original patent (4829570) for sending the audio over the power lines
(I had those speakers a long time ago as well). No real info on the 900
MHz FM wireless speakers. I may just have to open one up ? try to sort
it all out. If he used a commercial FM decodeer chip, there may be a
clean spot where I can tap into the lines comming out of that. There is
also a left/right/mono selector switch that would be a likely spot to
inject the audio.
Click to expand...

I used to visit their outlet store near Orlando. All the electronics
was imported from various Asian countries. All they did was warehouse
it there, and ship it out to stores. I doubt there was ever a schematic
for it in the US, since they used to sell piles of defective
electronics. They would test & repackage returned electronics, and dump
the rest. They also had other brands of accessories they did buybacks
on, to get stores to switch to their brands.

--
You can't have a sense of humor, if you have no sense.
 
Adrian C <email@here.invalid> wrote in
news:9qvfi6F5o3U1@mid.individual.net:

On 26/02/2012 13:22, Doug White wrote:
These things were also sold under the Advent and Radio Shack name.
They run on 900 MHz. I have the owner's manual, but it doesn't
include any repair info. I actually want to bypass RF and just use
them as battery powered speakers. I'm sure I could trace it out, but
it would be easier if I had a schematic, and I'm curious about the
inner workings of the RF as well.


FCC ID printed anywhere? As a wireless device, the whole thing could
be documented within the FCC's online database.
Click to expand...
The ID is CLV-A900R. It took some digging on the FCC web site, but I found
it under the Equipment Authorization search, under the CLV code.

Unfortunately, none of the Recoton stuff appears to be available on-line.
It's probably too old to be in electronic form & the FCC has never scanned
it.

Doug White
 
On Tue, 28 Feb 2012 22:43:17 GMT, Doug White <gwhite@alum.mit.edu> put
finger to keyboard and composed:

The ID is CLV-A900R.
Click to expand...
I only managed to find user manuals for the Advent AW820 and AW810,
but I'm not sure if they match your model:

http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/4001463_PM_EN.pdf
http://support.radioshack.com/support_audio/doc73/73257.pdf
http://support.radioshack.com/productinfo/ProductResults.asp?Name=Home_Speaker_Systems&ID=003008002

I also turned up a blank when I searched for RadioShack circuits for
cat #400-1463 and #40-1463 at the FCC database.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Franc Zabkar <fzabkar@iinternode.on.net> wrote in
news:n1ork75vl2ql1godp9dchn3mugvfo0q0ka@4ax.com:

On Tue, 28 Feb 2012 22:43:17 GMT, Doug White <gwhite@alum.mit.edu> put
finger to keyboard and composed:

The ID is CLV-A900R.

I only managed to find user manuals for the Advent AW820 and AW810,
but I'm not sure if they match your model:

http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/400146
3_PM_EN.pdf
http://support.radioshack.com/support_audio/doc73/73257.pdf
http://support.radioshack.com/productinfo/ProductResults.asp?Name=Home_
Speaker_Systems&ID=003008002

I also turned up a blank when I searched for RadioShack circuits for
cat #400-1463 and #40-1463 at the FCC database.

- Franc Zabkar
Click to expand...
Thanks. I have the user manuals, but I need to modify the circuitry &
was hoping I wouldn't have to sort it out the old fashioned way. No big
deal. At some point, tracing out the necessary signal paths is quicker
than tracking down the schematic. I think we've hit that point.

Doug White
 
On Thu, 01 Mar 2012 00:19:38 GMT, Doug White <gwhite@alum.mit.edu> wrote:

Franc Zabkar <fzabkar@iinternode.on.net> wrote in
news:n1ork75vl2ql1godp9dchn3mugvfo0q0ka@4ax.com:

On Tue, 28 Feb 2012 22:43:17 GMT, Doug White <gwhite@alum.mit.edu> put
finger to keyboard and composed:

The ID is CLV-A900R.

I only managed to find user manuals for the Advent AW820 and AW810,
but I'm not sure if they match your model:

http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/400146
3_PM_EN.pdf
http://support.radioshack.com/support_audio/doc73/73257.pdf
http://support.radioshack.com/productinfo/ProductResults.asp?Name=Home_
Speaker_Systems&ID=003008002

I also turned up a blank when I searched for RadioShack circuits for
cat #400-1463 and #40-1463 at the FCC database.

- Franc Zabkar

Thanks. I have the user manuals, but I need to modify the circuitry &
was hoping I wouldn't have to sort it out the old fashioned way. No big
deal. At some point, tracing out the necessary signal paths is quicker
than tracking down the schematic. I think we've hit that point.

Doug White
Click to expand...
Wireless speakers usually have a matching transmitter. Do you have one?

?-)
 
josephkk <joseph_barrett@sbcglobal.net> wrote in
news:nq48l7pi83nvihcmodqb5tsrcjid4av28o@4ax.com:

On Thu, 01 Mar 2012 00:19:38 GMT, Doug White <gwhite@alum.mit.edu
wrote:

Franc Zabkar <fzabkar@iinternode.on.net> wrote in
news:n1ork75vl2ql1godp9dchn3mugvfo0q0ka@4ax.com:

On Tue, 28 Feb 2012 22:43:17 GMT, Doug White <gwhite@alum.mit.edu
put finger to keyboard and composed:

The ID is CLV-A900R.

I only managed to find user manuals for the Advent AW820 and AW810,
but I'm not sure if they match your model:


http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/400146
3_PM_EN.pdf
http://support.radioshack.com/support_audio/doc73/73257.pdf

http://support.radioshack.com/productinfo/ProductResults.asp?Name=Home_
Speaker_Systems&ID=003008002

I also turned up a blank when I searched for RadioShack circuits for
cat #400-1463 and #40-1463 at the FCC database.

- Franc Zabkar

Thanks. I have the user manuals, but I need to modify the circuitry &
was hoping I wouldn't have to sort it out the old fashioned way. No
big

deal. At some point, tracing out the necessary signal paths is
quicker than tracking down the schematic. I think we've hit that
point.

Doug White

Wireless speakers usually have a matching transmitter. Do you have
one?
Click to expand...
Yes, but the modifications I want to make are to the audio circuitry in
the speakers.

Doug White
 
On Tue, 06 Mar 2012 01:11:36 GMT, Doug White <gwhite@alum.mit.edu> wrote:

josephkk <joseph_barrett@sbcglobal.net> wrote in
news:nq48l7pi83nvihcmodqb5tsrcjid4av28o@4ax.com:

On Thu, 01 Mar 2012 00:19:38 GMT, Doug White <gwhite@alum.mit.edu
wrote:

Franc Zabkar <fzabkar@iinternode.on.net> wrote in
news:n1ork75vl2ql1godp9dchn3mugvfo0q0ka@4ax.com:

On Tue, 28 Feb 2012 22:43:17 GMT, Doug White <gwhite@alum.mit.edu
put finger to keyboard and composed:

The ID is CLV-A900R.

I only managed to find user manuals for the Advent AW820 and AW810,
but I'm not sure if they match your model:


http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/400146
3_PM_EN.pdf
http://support.radioshack.com/support_audio/doc73/73257.pdf

http://support.radioshack.com/productinfo/ProductResults.asp?Name=Home_
Speaker_Systems&ID=003008002

I also turned up a blank when I searched for RadioShack circuits for
cat #400-1463 and #40-1463 at the FCC database.

- Franc Zabkar

Thanks. I have the user manuals, but I need to modify the circuitry &
was hoping I wouldn't have to sort it out the old fashioned way. No
big

deal. At some point, tracing out the necessary signal paths is
quicker than tracking down the schematic. I think we've hit that
point.

Doug White

Wireless speakers usually have a matching transmitter. Do you have
one?

Yes, but the modifications I want to make are to the audio circuitry in
the speakers.

Doug White
Click to expand...
My idea was to open it up and see what you can figure out from the
transmitter circuitry. Also you could run the transmitter and see what it
is transmitting. (maybe you have a spectrum analyzer or a emc reviewer)

?-)
 
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