Home  Resources  References  Tubes  Forums  Links  Support  Sale  Search 



   < Previous Message Index Next Message >   


Antique Radio Technical Forum


Posted by Lewis L on 04/20/2009 11:00

:Hi everyone,
:Just acquired a "little Wonder Microphone" from 30's-40's. It was sold as a novelty item so people could "hear" themselves over their radios. It came with the original box...however, missing instructions and cable. From looking at Ebay, I saw same...with instructions and cable (2 wire) This is a carbon Mic. My question is that of wiring into ckt. I figured that most were for plug into "phono or tv" inputs. Is it possible to wire this into the Oscillator/mixer stage, so as to use it with a signal tuned at a frequency and mix in the Microphone? Sort of like a 1941 "karaoke" machine! Even if not a possiblity, I'm confused as to where the two wires need to terminate. Looks to be a jack in back of mic. One button microphone. Any help greatly appreciate.
:Joe

Well, a carbon mike is not going to do anything unless it has some DC flowing through it. This is the way telephones worked for a hundred years. You can work it into a tube two ways. Put it inot the cathode of a tube, or use a battery and a capacitor into the grid of the tube.I can't think of a way to put a carbon mike into a tube circuit without some changes to the tube circuit.
Lewis



"Little Wonder Microphone" 
JoeinRI 04/20/2009 10:44 
Lewis L 04/20/2009 11:00 
JoeinRI 04/20/2009 12:46 
G. Berg 04/20/2009 13:58 
JoeinrRI 04/20/2009 14:17 
Lewis L 04/20/2009 14:46 
Edd 04/20/2009 16:43 
Radiodoc 04/20/2009 16:43 
Jim l 04/20/2009 21:22 
Joeinri 04/21/2009 07:12 

   < Previous Message Index Next Message >   




© 1996-2004 Nostalgia Air