Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Much hanks,
Bob

On Sun, 09 Aug 2015 12:45:55 -0400, Bob wrote:

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

It's still in the catalog:
http://comingsoon.radioshack.com/radioshack-mini-audio-amplifier/2771008.html

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Rumors of Radio Shack's demise have been greatly eggagerated. Many
stores are still open as is their mail order business.

Anyone have any ideas where I can purchase a few.

Online. See above URL.

Or eBay at outrageous prices:
http://www.ebay.com/sch/i.html?_nkw=277-1008

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Sun, 09 Aug 2015 09:53:14 -0700, Jeff Liebermann
wrote:

On Sun, 09 Aug 2015 12:45:55 -0400, Bob wrote:

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

It's still in the catalog:
http://comingsoon.radioshack.com/radioshack-mini-audio-amplifier/2771008.html

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Rumors of Radio Shack's demise have been greatly eggagerated. Many
stores are still open as is their mail order business.

Oops. Looks like the mail order business isn't there any more.
However, the store search found several stores that allegedly have it
in stock.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

I use these for simple hearing assist. No volume controls but nice. http://www.smokeyamps.com/

"Bob" wrote in message
...
Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Another alternative is an amplified PC speaker, if the input impedance is
too low just add a JFET source follower. You can use the volume pot as rhe
source resistor, then all you need is a gate-leak resistor and input
coupling capacitor.

Most types run off a wall-wart, but you can get them with an internal
battery compartment.

A couple of years back; a columnist in one of the hobby magazines mentioned
a speaker amplifier unit for Walkman style gadgets in the £1 shop - needless
to say, all gone by the time I got there. Apparently the unit had a pair of
small speakers driven by a TDA2822.

Ready made amplifiers aren't exactly rare, back in the 70s - 80s, any number
of component stockists advertised small amplifiers (just a populated PCB)
around the 250mW mark.

An old vest pocket transistor radio is a good candidate for the JFET
modification - but those are often collectibles, such vandalism would
horrify some people.

Search for Personal Amplifier on Amazon.com. There are several there that
have builtin microphones, but use earphones instead of a builtin speaker.
Prices are generally under $30.

My dad used one of those amplifiers for several years before his death.
Sorry, but it's long gone now, else I'd be glad to send it to you.

If you're into electronics kits, you might check out the kit at
http://www.bgmicro.com/KITMK136.aspx. Looks interesting, small enough to
put into a small box with a battery and carry in your shirt pocket. And
it's STEREO!!

Cheers,
Dave M



Bob wrote:
Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Much hanks,
Bob

"Dave M" wrote in message
...
Search for Personal Amplifier on Amazon.com. There are several there that
have builtin microphones, but use earphones instead of a builtin speaker.
Prices are generally under $30.

My dad used one of those amplifiers for several years before his death.
Sorry, but it's long gone now, else I'd be glad to send it to you.

If you're into electronics kits, you might check out the kit at
http://www.bgmicro.com/KITMK136.aspx. Looks interesting, small enough to
put into a small box with a battery and carry in your shirt pocket. And
it's STEREO!!

A stereo unit can be a PITA if you only want mono, but if its a common chip
and not already BTL, most have a sample circuit for a BTL amp included in
the appnote.

On Sun, 9 Aug 2015, Ian Field wrote:


"Bob" wrote in message
...
Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Another alternative is an amplified PC speaker, if the input impedance is too
low just add a JFET source follower. You can use the volume pot as rhe source
resistor, then all you need is a gate-leak resistor and input coupling
capacitor.

Most types run off a wall-wart, but you can get them with an internal battery
compartment.

A couple of years back; a columnist in one of the hobby magazines mentioned a
speaker amplifier unit for Walkman style gadgets in the £1 shop - needless to
say, all gone by the time I got there. Apparently the unit had a pair of
small speakers driven by a TDA2822.

Ready made amplifiers aren't exactly rare, back in the 70s - 80s, any number
of component stockists advertised small amplifiers (just a populated PCB)
around the 250mW mark.

An old vest pocket transistor radio is a good candidate for the JFET
modification - but those are often collectibles, such vandalism would horrify
some people.

And there's sort of a return to all this. In the old days, stereos were
big, now everyone with their Walkman, oops iPod, are throwing out their
stereo system and replacing it with a docking station, which is just an
amplifier with speakers in the same box, so stereo separation is virtually
non-existent.

Oddly, there was a period when boomboxes included auxiliary inputs,
because they wanted to be "ready" for CD players that were either not yet
out, or too expensive to build into the thing. So they also have
auxiliary inputs, if they are of the right vintage.

Anything with an amplifier should be useful, just find a way to feed the
audio into it. In the old days it was easy, the top of the volume control
would be the place, a coupling capacitor would make sure all was safe.
But now, the volume control may not be a suitable marker, the control may
not be attenuating the audio signal, but varying a DC voltage to control a
stage that is controlling volume.

Michael

"Anything with an amplifier should be useful, just find a way to feed the
audio into it. In the old days it was easy, the top of the volume control
would be the place, a coupling capacitor would make sure all was safe.
But now, the volume control may not be a suitable marker, the control may
not be attenuating the audio signal, but varying a DC voltage to control a
stage that is controlling volume."

Or a rotary encoder going to the microprocessor.

In article ,
says...

But now, the volume control may not be a suitable marker, the control
may
not be attenuating the audio signal, but varying a DC voltage to control a
stage that is controlling volume."

Or a rotary encoder going to the microprocessor.

I rather like my old JVC hi-fi in which the remote control (which
unfortunately was stolen!) causes a motor to turn a nice large volume
control knob, on which a flashing LED shows what setting it has reached.
Much better than a digital display!

I have only recently given up using my Nikko TRM 40LA amplifier which I
bought second hand from an ex-pat colleague on a business trip to NY
City in the early 1970s. Although it was fairly heavy (with of course a
large power transformer) it came back to the UK embedded in my dirty
laundry in my suitcase. Since the instruction booklet included a
schematic I tweaked some circuits as I saw fit...

Mike.

"Michael Black" wrote in message
news:alpine.LNX.2.02.1508092125250.25787@darkstar. example.org...
On Sun, 9 Aug 2015, Ian Field wrote:


"Bob" wrote in message
...
Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Another alternative is an amplified PC speaker, if the input impedance is
too
low just add a JFET source follower. You can use the volume pot as rhe
source
resistor, then all you need is a gate-leak resistor and input coupling
capacitor.

Most types run off a wall-wart, but you can get them with an internal
battery
compartment.

A couple of years back; a columnist in one of the hobby magazines
mentioned a
speaker amplifier unit for Walkman style gadgets in the £1 shop -
needless to
say, all gone by the time I got there. Apparently the unit had a pair of
small speakers driven by a TDA2822.

Ready made amplifiers aren't exactly rare, back in the 70s - 80s, any
number
of component stockists advertised small amplifiers (just a populated PCB)
around the 250mW mark.

An old vest pocket transistor radio is a good candidate for the JFET
modification - but those are often collectibles, such vandalism would
horrify
some people.

And there's sort of a return to all this. In the old days, stereos were
big, now everyone with their Walkman, oops iPod, are throwing out their
stereo system and replacing it with a docking station, which is just an
amplifier with speakers in the same box, so stereo separation is virtually
non-existent.

Oddly, there was a period when boomboxes included auxiliary inputs,
because they wanted to be "ready" for CD players that were either not yet
out, or too expensive to build into the thing. So they also have
auxiliary inputs, if they are of the right vintage.

Anything with an amplifier should be useful, just find a way to feed the
audio into it. In the old days it was easy, the top of the volume control
would be the place, a coupling capacitor would make sure all was safe.
But now, the volume control may not be a suitable marker, the control may
not be attenuating the audio signal, but varying a DC voltage to control a
stage that is controlling volume.

Most of the older shirt pocket items had about 4k7 volume pot, usually this
is too low for most signal sources you might want to patch into it.

My solution is to build a JFET source follower onto the input, you can use
the pot as the source resistor, in front of the JFET you only need a
gate-leak resistor and coupling cap.

On 8/9/2015 12:45 PM, Bob wrote:
Hello,

Hoping someone here might know.

Have been using a Radio Shack Mini Amplifier Model No. 277-1008
for many years to help out a person with a disability.
Really important for them

As no longer a R/S, have been trying to find who might actually
make/made this unit, and/or who might still be carrying them.

Anyone have any ideas where I can purchase a few.

Much hanks,
Bob



Bob,

There happens to be a new one on e-bay right now, for what I think is
too much money:

http://www.ebay.com/itm/Radioshack-M...item3cffb46b6b

If you watch e-bay and similar sites for a while you may find a few.

Regards,
Tim