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G8MNY > TECH 13.05.25 19:00l 66 Lines 2966 Bytes #10 (0) @ WW
BID : 32481_GB7CIP
Read: GUEST
Subj: Mic Preamps
Path: JH4XSY<JE7YGF<LU4ECL<LU9DCE<GB7YEW<VK2IO<VK3AT<N6CTA<GB7CIP
Sent: 250513/0951Z @:GB7CIP.#32.GBR.EURO #:32481 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
From: F5PBG@F5PBG.FBRE.FRA.EU (Corrected Oct 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
#################### SPEECH PREAMPLIFIER COMPRESSOR #####################
ﾚﾄｿ ﾚ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ﾂﾄﾄﾄﾄﾄﾄ
ｳ ｳ ｳ ｳ C4 ﾂ ｱ +15V.
ｳ ｳ R1 ｳ === C7 === ｱ R9
ｳ ｱ - C1 + 1ﾚﾄﾄｿ6ｳ ﾁ ｳ ﾃﾄﾄﾄﾂﾄﾄﾄｿ
ｳ ｱﾄﾄｱｱｱﾄﾄﾂﾄｺﾄﾄﾂﾄﾄﾄﾄﾄﾄｴI ﾃﾄﾙ ｳ ｳ ｳ ｳ
ｳ ｱ R2 ｳ ｳ ｳC ｳ +C5- R7 C6 D1 ｳ ｳ/ ｳ ｳ
ｳ ｳ ｳ ｳ 2ｳ1 ﾃﾄﾄﾄﾂﾄｺﾄﾂﾄｱｱｱｱﾄﾄｺﾄﾂﾄｱ>ﾛｱﾄﾄﾁﾄﾄｴ TR2 ｳ ｳ
3 ｳ ｳ === C2 ﾚｴ ｳ4 ｳ ｳ ｳ ｳ\ ｳ ｳ
IN ｳ ﾃﾄﾄｿ ｳ ﾚﾄﾄｴﾀﾄﾄﾙ ｳ ｳ ｳ ﾚﾄｱﾛ<ｱﾄﾄﾄﾄﾙ ｳ ｳ
3 ｳ ｳ ｳ ｳ ｳ ﾃﾄﾄｱｱｱｱﾄﾙ ｳ ｳ ｳ D2 ﾚﾄﾄﾁｿ ｳ
ｳ ｳ TR1ｺﾄﾄﾙ ｳ ｳR4ｱ ｳ R6 ｳ ｳ ｳ ｳ/ ｳ ｳ
ｳ ｳ ﾚﾄﾄｺ R3 ｱ ｳ ｱ ｱR5 ｳ ｳ ﾀﾄﾄﾄﾄﾄﾄﾄﾄｴ ｳ ｳ
ｳ ｳ ｳ ｺﾄﾄｿ ｱ ｳ ｱ ｱ ｳ ｱ R8 TR3 ｳ\ C8ｳ ｳ
ｳ ｳ ｳ ｳ ｱ ｳC3ｳ+ ｱ ｳ ｱ ｳ === ｳ
ｳ ｳ ｳ ｳ ｳ ｳ === ｳ ｳ ｳ R10 ｱ ｳ ｳ
ｳ ｳ ｳ ｳ ｳ ｳ ｳ- ｳ ｳ ｳ ｱ ｳ ｳ
ﾀﾂﾁﾄ)ﾄﾄﾄﾄﾄﾁﾄﾄﾁﾄﾁﾄﾄﾁﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾙ ｳ
ﾄﾁﾄ 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ﾙ
ｳ ｳ
ﾚ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 ｳ
ｳ R15 ｳ
ｳ ﾚﾄﾄﾄﾄｱｱｱｱﾄﾄﾄﾄﾄｿ ｳ
R11 ｱ R13 ｳ ﾚﾄﾄﾄﾄｿ ｳ +C11- ｳ
ｱﾄﾄｺﾄﾄｱｱｱｱﾄﾂﾄｱｱｱｱﾄﾄﾂﾁﾄﾄﾄﾄﾄﾄｴ I ﾃﾄﾁﾄﾄﾄｺﾄﾄﾄﾄ)ﾄﾄｿ
ｳ -C9+ ﾀﾄﾄﾙ R12 ｱ 7ｳ C ｳ5 ｳ ｱﾄﾄﾄﾄﾄﾄｿ
ｳ R14 ｱ ｳ 1� ｳ ｳ ｱR16
ｳ ｳ ﾚﾄﾄｺﾄﾄｴ ﾃﾄﾄｿ ｳ ｱ OUT
ｳ ｳ ｳC10 8ﾀﾄﾄﾄﾄﾙ3 ｳ ｳ ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾁﾄﾄﾄﾄﾄﾄﾙ
R1= trimmer 500 k. C1= 2.5 uF 16V elect.
R2= 100 k. C2= 100 pF.
R3= 1 M. C3,C5,C11= 5 uF. 64V elect.
R4= 2,2 M. C4= 100.000 pF.
R5= 27 k. C6= 47.000 pF.
R6= 120 k. C7= 27 pF.
R7= 47 Ohm. C8= 1 uF. 40V elect.
R8= 47 k. C9= 4,7 uF 16V elect.
R9= 2,2 M. C10= 100.000 pF.
R10= 270 Ohm. TR1= 2N3820
R11= trimmer 100 k. TR2 TR3= 2N1711 MC140
R12= 22 k. D1 D2= 1N914 1N4148
R13= trimmer 50 k. IC1= LM387
R14= 100 k.
R15= 470 k.
R16= Pot. lin. 50 k.
73's de Ludovic. e-mail: radioham@chez.com
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This preamp has high gain, but should have a flat response 300-3k..
Why Don't U send an interesting Bul?
73 De John, G8MNY @ GB7CIP
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