Message 26092 in TECH.WW
From: G8MNY
Date: Sun, 19 Jul 26 08:11:00 Z
Newsgroups: TECH.WW
Subject: Mic Preamps
Message-ID: <65273_GB7CIP>
Path: N2NOV|N2MH|N2MH4|GB7BED|EI2GYB|GB7CIP
R:260719/0812z @:N2NOV.#RICH.NY.USA.NOAM $:65273_GB7CIP
R:260719/0812z @:N2MH.#NNJ.NJ.USA.NOAM [via AREDN Mesh] jnos 2.0p $:65273_GB7CIP
R:260719/0812Z 33962@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260719/0812Z 14518@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260719/0811Z 56591@EI2GYB.DGL.IRL.EURO LinBPQ6.0.25
R:260719/0811Z @:GB7CIP.#32.GBR.EURO #:65273 [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 #####################
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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