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G8MNY > TECH 07.10.25 15:51l 84 Lines 4422 Bytes #4 (0) @ WW
BID : 42289_GB7CIP
Subj: Another Mic Preamp
Path: JH4XSY<N3HYM<GB7YEW<GB7CIP
Sent: 251007/0650Z @:GB7CIP.#32.GBR.EURO #:42289 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
From: 2E1ESY@GB7NND.#23.GBR.EU
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
The microphone below I have made & used now for around 15 years, it has lots of
gain & a very small current drain, the 1.5V battery will last for over a year
with daily use.
Pre-Amp Microphone
==================
+1.5V
ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｴ
ｳ ｳ ｳ ｳ ｳ ｳ
ｳ ｳ ｳ R5 ｱ ｳ R6 ｱ ﾉﾍﾍﾍﾍﾍﾍﾍﾍﾍｻ -1.5V
C5 ｳ ｳ ｳ ｳ ｳ ｳ ﾚﾄﾄﾄｺﾄﾛﾛ ﾛﾛﾄｺﾄﾄﾄﾄﾄﾄｴ
ﾚｴﾃﾙ ｳ ｳ C6 ｳ ｳ + C7 ｳ ｳ ｺ SW1 ｺ
ｳ ｳ ﾀﾄﾄﾄｴﾃﾄﾄﾄｴ ﾀﾄﾄﾄﾛﾃﾄﾄﾄｴ ｳ ﾚﾄｺﾄﾛﾛ ﾛﾛﾄｺﾄｿ
ｳ R1 ｱ ｳ R7 ｳ ｳ ｳ ｺ ｺ ｳ
ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｳﾄﾄﾄﾄｱｱｱｱﾄﾄﾄﾄｴ ｳ ｳ ｺ ﾛﾛ ﾛﾛ ｺ ｳ
ｳ ｳ ｳ ｳ ｳ ｳ ｳ ﾈﾍﾍﾍﾍﾍﾍﾍﾍﾍｼ ｳ
E1 + ｳ ｳ+ C1ｳ ﾚﾄﾄcﾄﾄﾄｴ ﾚﾄ<ﾄeﾄﾙ ｳ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾙ
ｲｲｲｲﾄﾄﾄﾄﾄｳﾄﾄﾄﾄﾄﾄﾄﾅﾄﾛﾃﾄﾅﾄbｴT1 ﾀﾄﾄﾄﾄﾄbｴT2 ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｳﾄﾄﾄﾄﾄPTTﾄ>
ｲｲｲｲﾄﾄｿ ｳ ｳ ｳ ﾀﾄ>eﾄｿ ﾀﾄﾄﾄcﾄｿ ｳ
- ｳ ｳ C2 ｳ ｳ ｳ ｳ+ C4 ｳ
ｳ ｳ ﾚｴﾃﾙ ｳ ｳ ﾚﾄｴﾃﾄﾄﾄﾅﾄﾛﾃﾄｿ ﾃﾄSCREENﾄﾄ>
ｳ ｳ ｳ R2 ｱ R3 ｱ ｳ C3 ｳ ｳ ｳ
ｳ ｳ ｳ ｳ ｳ ｳ ｳ ｱ<ﾄﾄﾄﾄﾄﾄﾄﾄﾄｳﾄAUDIOﾄﾄﾄ>
ｳ ｳ ｳ ｳ ｳ ｳ R4 ｱ ｳRV1 ｳ
ﾄﾄﾄﾄﾄﾄﾁﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄｴ
Resistors:- R1,R4=1k. R2,R7=100k. R3=470ohm. R5=10k. R6=510ohm. RV1=5k lin pot.
Capacitors:- C1,C4,C7=1mf mini electrolytic capacitor. C2=1nf disc capacitor
C3,C5,C6=4.7nf disc capacitor.
Transistors:- T1=BC549C. T2=BC559C.
E1=Electret Mic Element. SW1=D.P.D.T. Switch.
---------------------------------------
MATRIX BOARD LAYOUT
===================
+ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ﾉｳﾍﾍｻE1 ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｳﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄｿ
ｺ ｺ ｳ ﾉﾍﾍﾍﾍﾍﾍﾍｳﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｳﾍﾍｳﾍｻ ｳ ﾉﾍﾍﾍﾍﾍﾍﾍﾍﾍｻ
ﾈﾍﾍｳｼ ｳ ｺ ﾂ o ｳ oC2ﾂ ﾂ o ﾂR3 oC3ﾂ ﾂR4ﾁ ﾁ ｺ ｳ ｺ RV1 ｺ
ｳ- ｳ ﾌﾍｳﾍﾍﾍﾍﾍｳﾍﾍﾍﾍﾍｳﾍﾍｳﾍﾍﾍﾍﾍｳﾍﾍﾍ*ﾍﾍﾍﾍｲﾍﾍｱﾍﾍﾍﾍﾍﾍﾍｹ ｳ ｺ ｺ
ﾚﾄﾄﾄﾙ ｳ ｺ ｳL1o ｳ o ｲ ｳR2o ｱ * ﾂc ﾁ ﾁ +ﾂC4o ｺ ｳ ﾈﾍﾋﾍﾍﾋﾍﾍﾋﾍｼ
ｳ ﾚﾄﾄｳﾄﾄｿ ﾌﾍｳﾍﾍﾍﾍﾍｳﾍﾍﾍﾍﾍｳﾍﾍｱﾍﾍﾍﾍﾍｳﾍﾍﾍ*ﾍｳﾍﾍﾍﾍﾍﾍﾍﾍｲﾍﾍﾍﾍｹ ﾀﾄﾄﾄﾄﾄﾙ ﾀﾄﾄｳｿ
ｳ ｳ ｳ ｳ ｺ ｳ ﾂ ﾁ +ﾂ ﾁ ｳ ﾂe ﾁ * ｳT2o o ﾁ oﾄｺﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙｳ
ｳ ﾚﾄｳﾄﾄｳﾄｿｳ ﾌﾍｳﾍﾍｳﾍﾍﾍﾍﾍｲﾍﾍﾍﾍﾍｳﾍﾍﾛﾍﾍﾍﾍﾍﾍ*ﾍﾛﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｹ ﾉﾍﾍﾍﾍﾍﾍﾍｻ ｳ
ｳ ﾉﾍｳﾍｳﾍｻｳ ｳｳ ｺ ｳ ｳR1o ﾁC1o ﾁ ﾛb ﾂ * bﾛ o ﾂL2o o ｺ ｺ(-) (+)ｺ ｳ
ｳ ｺ | | ｺｳ ｳｳ ﾌﾍｳﾍﾍｳﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾛﾍﾍｱﾍﾍﾍ*ﾍﾛﾍﾍﾍﾍﾍｳﾍﾍﾍﾍﾍﾍﾍｹ ﾈﾍｳﾍﾍﾍｳﾍｼ ｳ
ﾃﾄｺﾄ|ﾄ|ﾄｺﾙ ｳｳ ｺ ｳ ｱ o o o oT1ｳ ﾁR7o ﾁe ﾂ ｳ ﾂ o ｺ ﾚﾄﾄﾙB1 ｳ ｳ
ｳ ｺ | | ｺ ｳｳ ﾌﾍｳﾍﾍｳﾍﾍﾍﾍﾍﾍﾍ*ﾍﾍﾍﾍﾍﾍｳﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｳﾍ*ｳﾍﾍｳﾍﾍﾍﾍｹﾚﾄｳﾄﾄﾄﾄﾄﾄﾙ ｳ
ｳ ﾈﾍﾍﾍﾍﾍｼ ｳｳ ｺ ﾁ ｳ ﾂ *o o ﾁc ﾂ ﾂ o ｱ *ﾁ ｲC7o ｺｳ ｳ ｳ
ｳ S1 ｳｳ ﾌﾍﾍﾍﾍｳﾍﾍｲﾍﾍﾍﾍ*ﾍﾍﾍﾍﾍﾍﾍﾍﾍｱﾍﾍｲﾍﾍﾍﾍﾍｳﾍ*ﾍﾍﾍｳﾍﾍﾍﾍｹｳ ｳ ﾚﾄﾄﾄﾄﾄﾄﾙ
ｳ ｳｳ ｺ o ﾁ ﾁC5o o o oR5ﾁ ﾁC6o ﾁR6o +ﾁ oﾄｺﾙ ｳ ｳ AUDIO
ｳ ｳｳ ﾈﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｼ ｳ ﾀﾄﾄﾄﾄﾄﾄ>
ｳ ｳﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ P.T.T.
ｳ ｳ
ｳ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ>
ｳ SCREEN
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ>
Output to TX >>>>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DIAGRAM VIEWED FROM COMPONENT SIDE, COPPER STRIP ON OPPOSITE SIDE
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Diagram Symbols:- ｱ = Resistors. ｲ = Capacitors. o = Vero board holes
e c
ﾛ ﾛ
ﾛb bﾛ = Transistors. * = Breaks in Copper track.
ﾛ ﾛ
c e
+ = Marked on diagram for the positive connection on electrolytic capacitors
L=Link Wire. B1=1.5V AA Cell Battery
---------------------------------------------------------------------
ｺ ｳ 73 de Alan ｳ ｺ
ｺ ｳ 2E1ESY @GB7NND.#23.GBR.EU ｳ ｺ
Why don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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