🚀 go-pugleaf

In article <31703a33.711113@news.demon.co.uk>, Michael Clements
<Michael@zoec.demon.co.uk> writes
>On Fri, 12 Apr 1996 22:30:12 +0100, Frank Erskine
>>Although a telephone itself has only two wires, the handset itself has
>>four - two for the microphone and two for the earpiece.  Traditionally
>>the microphone wires are blue and white and the earpiece wires are red
>>and green (if I remember correctly!).  You can quickly check by briefly
>>connecting a 1.5V cell (battery) across the red/green, when you should
>>hear a click in the earpiece.
>Thanks for this info. Do you happen to know whether there is any
>reason why this should not work- for instance that the mic unit in a
>standard handset has such a low output that the SB16 would be unable
>to amplify it even at x8 gain setting to be of use or that the speaker
>in the handset is incompatible in some way owing to its impedence.
>Has anyone actually tried this mod yet?
>
>--
>Michael Clements
As I said in my follow-up, you'd need a power supply to the microphone,
and with that you'd get a fairly high output.  If it's an *old-
fashioned* type handset you can perhaps fit another earpiece in place of
the microphone and that should work ok as a mike.
Regarding the impedance, I don't know how it'll match up to the SB!
Often the input impedance to an amplifier such as the SB is high, so
that it'll accept almost any input impedance.
Why not try it and see? :-)
-- 
Frank Erskine
Sunderland