-=> On 09-26-97  22:47, Steve Brack said to Ivy Iverson,<=-
-=>"About Ramsey HR-40 reciever...,"<=-
-=> * In a message to Stan Black on 09-15-97, IVY IVERSON said the
-=> On -Fr-Se  97 21, Stan Black said to All,<=-
 
Hi, Steve;
 
 II> It used to be that you could buy small audio amps that would drive a
 II> speaker to full room volume from a mic from RadShack for a few $$, but
 II> those days are gone forever.  (I made several intercoms using them).
 SB> Check the handbook for schematics of small af amps.  They are easy to
 SB> build with a few $$ of easily available parts.  The hardest part would
 SB> be etching a PC board for it.
 
 SB> Well, Radio Shack's 277-1008 (for about $10) combines a
 SB> speaker & an amp that can be powered by 9VDC or from a $7 AC
 SB> adaptor.  Almost every store stocks them.
 
That's a complete amp, I was referring to a module.  (I suppose one could
gut one of the ones you mention and put it in a different case, though.)
 
The amp I am referring to was a PC board about 1 1/2 X 3 inches, and you
could feed a microphone into it, (I used small loudspeakers and output
transformers connected in reverse), and it would put out a couple of
watts - plenty to drive 4 speakers in different areas to reasonable
volume in two buildings.  (It was an all-call system which used the
black-yellow pair in the phone wiring).
 
But I guess RadShack doesn't think that people actually BUILD things any
more!
 
I don't care to etch PC boards unless I have to, (it's messy and the
chemicals are poisonous and I don't want my cats to get into it), but I
would like to be able to pick up an occasional module, such as a small
audio amp, and incorperate it into something I am building.  (Heck, you
can never have too many small AF amps lying around!)  :->
 
73 DE KB9QPM
   Ivy
 
 
 
... Become hot stuff... learn to solder!   ;->
 
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