Circuits of audio pre-Amp mic

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A microphone preamp is a preamplifier used to amplify a microphone's low output voltage to a stronger, more usable level. A microphone preamp must provide stable gain for small signals without being sensitive to induced noise from cabling and without distorting large amplitude signals. Most microphones must be used in conjunction with a microphone preamp to function properly.

Simple audio Pre-Amp mic

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This circuits use infront an RF oscilator to make an RF transmitter that is very sensitive to sound

Rangkaian Pre-Amp Sepul Gitar

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This is a pre-amp guitar circuit suitable for high impedance type electric guitar pickups. The circuit is based on a uA 741 op-amp (IC1). The IC1 is wired as a non-inverting amplifier. Resistor Variable R1 can be used as a volume controller. Resistor Variable R6 can be used as tone controller. The switch S1 is used to produce “brilliant” or “soft” tonal effects.

Skema rangkaian Pre-Amp sepul gitar

Description Op-Amp UA741

The UA741 is a high performance monolithic operational amplifier constructed on a single silicon chip. It is intented for a wide range of analog applications.

* Summing amplifier
* Voltage follower
* Integrator
* Active filter
* Function generator

The high gain and wide range of operating voltages provide superior performances in integrator, summing amplifier and general feedback applications. The internal compensation network (6dB/ octave) insures stability in closed loop circuits.

Data max Ic UA741

* Symbol Parameter UA741M UA741I UA741C Unit
* Supply voltage (VCC) ±22 V
* Differential Input Voltage (Vid ) ±30 V
* Input Voltage (Vi ) ±15 V
* Power Dissipation (Ptot) 500 mW
* Storage Temperature Range (Tstg) -65 to +150 °C.

Rangkaian Pre-Amp Mic 2 Transistor.

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Here is a Pre-amp microphone dynamic using two transistors. The circuit factor of this around 150 and can handle signals from 50Hz to 100Khz.This circuit is designed for use with 200 Ohm dynamic microphones. For usage with low impedance microphones, the value of R3 must be increased to around 47o Ohms and C1 must be decreased to around 2.2uF.

Skema rangkaian Pre-Amp mic 2 transistor

The audio signal from the microphone is coupled to the base of Q1 via the capacitor C1 and resistor R3. Q1 works as a preamplifier here. The preamplified signal will be coupled to the base of Q2 for further amplification. Resistor network comprising of R4, R5 and R6 provides the necessary negative feedback. Final output signal will be available at the emitter of Q2.

Layout Transistor BC549 & BC546

Transistor BC549 Absolute maximum rating

• VCBO collector-base voltage open emitter...............30 V.
• VCEO collector-emitter voltage open base...............30 V.
• VEBO emitter-base voltage open collector................5 V.
• IC collector current (DC)........................................100 mA.
• ICM peak collector current......................................200 mA.
• IBM peak base current............................................200 mA.
• Ptot total power dissipation Tamb £ 25 °C..................500 mW.
• Tstg storage temperature...................................... -65 to +150 °C.
• Tj junction temperature..........................................150 °C.
• Tamb ambient temperature..................................... -65 to +150 °C.
• hFE DC current gain VCE = 5 V, IC = 2 mA .............420 to 800.

Transistor BC546 Absolute maximum rating

• VCBO collector-base voltage open emitter..................80 V.
• VCEO collector-emitter voltage open base..................65 V.
• VEBO emitter-base voltage open collector..................6 V.
• IC collector current (DC).........................................100 mA.
• ICM peak collector current.......................................200 mA.
• IBM peak base current.............................................200 mA.
• Ptot total power dissipation Tamb £ 25 °C.................. 500 mW.
• Tstg storage temperature........................................ -65 +150 °C.
• Tj junction temperature...........................................150 °C.
• Tamb operating ambient temperature ........................-65 +150 °C.
• hFE DC current gain VCE = 5 V, IC = 10 mA..............150.

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

Rangkaian Op-Amp (LM741) Pre-Amp Mic

type='html'> Op-Amp Pre-Amp Mic

This is the circuit of Op-Amp Microphone Preamplifier using a single power supply, this circuit suitable for dynamic or electret microphones. Nothing too special here. The Schematic is shown using a dynamic microphone, for use with an electret a pair of suitable biasing resistor is required to power the electret microphone.

Skema rangkaian op-amp pre-amp mic

Note:

• use a capacitor with voltage 25volt or more
• so that the sound produced maximal use supplay good voltage, with output of 18 volts max
• If the desired strengthening of the different, you can change the value of R1 or R2

The design is a standard non-inverting design, the input is applied to the non-inverting input of the op-amp, which is pin 3 in most cases. The input impedance is 23.5k, the overall voltage gain is determined by R2 and R1according to the following formula:

Vo = (R2 / R1) + 1

With the values of R2 and R1 on the diagram of the voltage gain (for mid band, 1kHz) is approximately 23x or 27.2dB.

Pinning IC Op-Amp LM741