RED Free Circuit Designs Page38

From: Subject: RED Free Circuit Designs Page38 Date: Sun, 17 Feb 2002 23:42:43 -0500 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0000_01C1B80C.CB758700"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4807.1700 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C1B80C.CB758700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://space.tin.it/scienza/fladelle/Page38.htm RED Free Circuit Designs Page38
Amplified Ear

Useful to listen in faint = sounds 1.5V Battery operation

Circuit diagram:

3D"Amplified

Parts: =

P1_____________22K   Log. Potentiometer (see Notes)

R1,R9__________10K   1/4W Resistors
R2______________1M   1/4W Resistor
R3______________4K7  1/4W Resistor
R4,R7_________100K   1/4W Resistor
R5______________3K9  1/4W Resistor
R6______________1K5  1/4W Resistor
R8_____________100R  1/4W Resistor

C1,C2_________100nF  63V Polyester or Ceramic Capacitors
C3,C6___________1=B5F  63V Polyester or Ceramic Capacitors
C4_____________10=B5F  25V Electrolytic Capacitor
C5____________470=B5F  25V Electrolytic Capacitor

D1___________1N4148  75V 150mA Diode

Q1,Q2,Q3,_____BC547  45V 100mA NPN Transistors
Q4____________BC337  45V 800mA NPN Transistor

MIC1__________Miniature electret microphone

SW1____________SPST Switch (Ganged with P1)

J1_____________Stereo 3mm. Jack socket

B1_____________1.5V Battery (AA or AAA cell etc.)

Device purpose:=20

This circuit, connected with 32 Ohms impedance mini-earphones, can = detect=20 very remote sounds. Useful for theatre, cinema and lecture goers: every = word=20 will be clearly heard. You can also listen to your television set at a = very low=20 volume, avoiding to bother relatives and neighbours. Even if you have a=20 faultless hearing, you may discover unexpected sounds using this device: = a=20 remote bird twittering will seem very close to you.=20

Circuit operation:=20

The heart of the circuit is a constant-volume control amplifier. All = the=20 signals picked-up by the microphone are amplified at a constant level of = about 1=20 Volt peak to peak. In this manner very low amplitude audio signals are = highly=20 amplified and high amplitude ones are limited. This operation is = accomplished by=20 Q3, modifying the bias of Q1 (hence its AC gain) by means of R2.
A = noteworthy=20 feature of this circuit is 1.5V battery operation.
Typical current = drawing:=20 7.5mA.=20

Notes:=20

Due to the constant-volume control, some users may consider P1 = volume=20 control unnecessary. In most cases it can be omitted, connecting C6 to = C3. In=20 this case use a SPST slider or toggle switch as SW1.=20
Note the stereo output Jack socket (J1) connections: only the two = inner=20 connections are used, leaving open the external one. In this manner = the two=20 earpieces are wired in series, allowing mono operation and optimum = load=20 impedance to Q4 (64 Ohms).=20
Using suitable miniature components, this circuit can be enclosed = in a=20 very small box, provided by a clip and hanged on one's clothes or = slipped in a=20 pocket.

Having Questions?

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