[sdiy] Using a phone earpiece as a speaker???

[John L Marshall]

Decades ago I used carbon microphones by connecting the microphone directly 
to the cathode of a grounded grid amplifier. The grounded grid provided bias 
current and a reasonable impedance match to the low impedance of the 
microphone. Only a few volts are required.

Take care,
John
www.sound-photo.com
www.antenna-farm.com

----- Original Message ----- 
From: <harrybissell at copper.net>
To: <lief138 at yahoo.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, January 11, 2007 10:59 AM
Subject: RE: [sdiy] Using a phone earpiece as a speaker???


> You should be able to activate the earpiece...
> its is essentially a speaker. It has two terminals
> you can hook to an amplifier...
>
> The 'old school' mouthpiece is a CARBON
> microphone... it needs to have a DC voltage
> imposed across it (how much ... don;t know)
> and then AC couple the input in to your
> uhhh... input ???
>
> H^) harry
>
>
>>
>>
>>
>>---- Original Message ----
>>From: lief138 at yahoo.com
>>To: synth-diy at dropmix.xs4all.nl
>>Subject: RE: [sdiy] Using a phone earpiece as a speaker???
>>Date: Thu, 11 Jan 2007 10:09:42 -0800 (PST)
>>
>>>Hi Everyone, I wanted to output to a telephone
>>>earpiece, the old kind of phone, you know doubles as a
>>>club....
>>>I found the wires that go to the speaker but its not
>>>happening for me. Does anyone know the secret or where
>>>I might look online?
>>>Also, how about using the talk into part as a mic???
>>>Thanks, Lief
>>>
>>>
>>>
>>>____________________________________________________________________
>>________________
>>>Need a quick answer? Get one in minutes from people who know.
>>>Ask your question on www.Answers.yahoo.com
>
>
>