Rangkaian Pre-Amp Mic Condenser

type='html'>Pre-Amp Mic Condenser

Microphone amplifier circuit is simple, consisting of 2 levels. with wide dynamic regions, small noise, and can with a long cable about 50 meters.

Skema rangkaian Pre-Amp mic condenser

Note:

all capacitor (elco) using 25-volt
to avoid the buzzing sound, use a good regulator supplay
This circuit can provide voltage 6-20volt

This circuit uses low noise transistors are type types: BC 650 C but the transistor is hard to find, so you can replace it with 109 BC is no less good. This condenser mic element in it is a very sensitive microphone, and to use this mic condenser required voltage between 2-10 volts, for that we can resistors in series with 1K-10 K ohms, in the picture above the tide 1k ohms

Pin BC109

1. Emitter
2. Base
3. ollector, connected to the case

BC109 limiting values

collector-base voltage 30 V
collector-emitter voltage 20 V
emitter-base voltage 5 V
collector current (DC) 100 mA
peak collector current 200 mA
peak base current 200 mA
total power dissipation Tamb £ 25 °C - 300 mW
storage temperature 65 +150 °C
junction temperature 175 °C
operating ambient temperature -65 +150 °C
DC current gain (hFE) IC = 10 mA; VCE = 5 V 100 -- 270

Microphone Condenser Pre Amplifier Circuit

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This is a simple preamplifier circuit for electret condenser microphone. using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn’t normally accept microphone level signals .

Schematic Circuit of Microphone Electret
Condenser Pre Amplifier

The circuit requires a 6-9 volt supply. Output of the microphone amplifier can be made variable by connecting a 10kΩ potentiometer . Circuit’s gain can be increased by men perbesar the value of 47K, depending on the input sensitivity of the main amplifier system. The microphone should be housed in a small round enclosure.

List componet of condenser pre-amp mic circuit

Q1,Q2 : LM1458 Op-Amp
R1,R2,R3 : 4.7k ohm resistor
R4, R5 : 10k ohm resistor
R6,R7 : 47k ohm resistor
C1, : 0.22uF ceramic capacitor
C2 : 1uF ceramic capacitor

Absolute maximum ratings of LM 1458 IC

Supply Voltage : ±18V
Power Dissipation : 400 mW
Differential Input Voltage : ±30V
Input Voltage : ±15V 
Output Short-Circuit Duration: Continuous
Operating Temperature Range : 0°C to +70°C
Storage Temperature Range : −65°C to +150°C
Lead Temperature :(Soldering, 10 sec.) 260°C