Maker Pro
Maker Pro

Quick Condenser Mike question.....

L

Les & Claire

Jan 1, 1970
0
Hi all....
I know these things work on capacitance but do the lead in
wires have to be a certain length? Can I just tack some 2core on the board
and have a, say, 8ft length of wire to the mike? It's a mini fm transmitter
btw....

Les



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L

Lizard Blizzard

Jan 1, 1970
0
Les said:
Hi all....
I know these things work on capacitance but do the lead in
wires have to be a certain length? Can I just tack some 2core on the board
and have a, say, 8ft length of wire to the mike? It's a mini fm transmitter
btw....

If the leads are short, you could use some twisted pair wire. The
capacitance of the wire has almost nothing to do with it. The reason
why you should use shielded microphone wire for longer lengths is
because the signal levels are only a millivolt or less. Using shielded
wire keeps out the AC hum.

One other factor that you have to consider with a mini FM Tx. The unit
itself radiates RF, and the microphone leads will be a part of the unit,
and also radiate RF. So shielded cable will help keep the RF out of the
mic input. Another thing that should be included is a ferrite bead RF
choke on the mic input lead, to reduce RF even further. A small 1 nF
capacitor at the base of the audio amp transistor will bypass any
remaining RF to ground.




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L

Les & Claire

Jan 1, 1970
0
Thanks very much... off to experiment!
Les


--
Top Posting© Since 1997

"Oh Bother!" said the Borg, "We've assimilated Pooh!"

"That's 10 times I've explained binary to you. I won't tell you a 3rd time!"
 
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