Battery powered desk microphone
Component List
TR1-BC549.... TR2-BC559.......VR1-5KOhm.........SW1-DPDT type
MIC-Electret miniature........R1-1K........R2-330 Ohm......R3-100K
R4-10K......R5-470 Ohm.....R6-470 Ohm......R7-1K.....R8-4.7K.......R9-100K
C1-1 UF 50 V.......C2-1nF metal film.......C3-4.7 nF ceramic......C4-1 UF 50 V
C5-1 UF 50 V.......C6-0.1 UF ceramic......C7-0.1 UF ceramic
The battery to be used is an AA type
This mike is VERY POWERFUL you will only need to have the gain very low to be the same level as a stock mike !
I have designed this mike to be loud but i have restricted it because it was too BLOODY LOUD !
This mike works best on FM or AM sets,
it is too loud for SSB
(it picks up too much background noise)
If you build this unit and like it please email me !
Enjoy !
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