Microphone amplifiers: circuit. Microphone amplifier for electret microphone

A microphone amplifier is a device that increases the conductivity of a signal. This process is provided at the expense of conductors. The standard model includes capacitors, as well as thyristors. Modulators in the amplifiers are installed in different types.

To increase the sensitivity of conductors, tetrodes are used. Expanders are installed in different capacities. Contactors are used to maintain a stable voltage in the circuit. In order to learn more about devices, you should consider specific types of microphone amplifiers.

Single-cycle modification scheme

Single-ended microphone amplifiers ( shown below) are made on the basis of wire capacitors. In this case, the trigger is selected with a high conductivity signal. Many models use two resistors. If we consider a low-power amplifier, then it has one filter installed.

Directly thyristors are used without a conductor. Transceivers for models are installed behind the expanders. The output sensitivity index is around 4.5 mV. In this case, the threshold voltage does not exceed 10 V. The current overload indicator depends on the conductivity of the expander.

Two-stroke type model

The push-pull amplifier on the chip is made with field capacitors. Expanders for models are used in different capacities. As a rule, the output sensitivity parameter does not exceed 5 mV. In this case, triggers are used without conductors.

On average, the threshold voltage on the insulators is 12 V. Make this type of microphone amplifier with your own hands easily. For this, a PP20 series chip is selected. The expander will be required directly with a capacitance in the region of 6 pF. A thyristor is also installed with the capacitors. The conductivity of the signal in this case should be at least 2.2 microns.

The device three-stroke amplifier

Three-stroke microphone amplifiers (shown below) contain field capacitors. In total, the device has two triggers. The output sensitivity is 5.8 mV. In this case, expanders are used at 2 pF. Direct contactors are installed with insulators.

If necessary, you can assemble the microphone amplifier yourself. To do this, the microchip of a multichannel type is first taken. Also for the amplifier, an expander with a capacitance of about 2.3 pF is required. If we consider a simple model, then the filter is allowed to use an absorbing type. The parameter of the current overload should average no more than 6 A.

How to make a model with a common emitter yourself

Microphone amplifiers (the circuit is shown below) with a common emitter are added on the basis of field capacitors. Resistors are used with a high conductivity parameter. First of all, the thyristor is harvested for assembly. Install it follows the trigger. The output sensitivity of the element should not exceed 6.5 mV. In turn, the current overload parameter must be equal to 8 A. The contactor on the board is installed next to the filter.

Device with collector

Amplifiers with a collector are well suited for studio microphones. Capacitors for models are impulse type. There are three resistors in the circuit. The output sensitivity parameter is 5.6 mV on the average. In this case, the trigger is used in a two-bit or three-digit type. If we consider the first option, then the expander is selected with a capacity of up to 5 pF.

The thyristor is used with a contactor. Directly transceivers are located near the capacitors. The minimum output voltage is 12 V. If we consider a circuit with a three-bit trigger, then the expander is used with a capacitance of more than 5 pF. Condensers are installed only vector type. In total, the model requires three modulators. The minimum output voltage is 15 V. To stabilize the threshold current, filters are used.

Device with AGC (automatic gain control)

Amplifiers with AGC have recently become quite popular. First of all, they are characterized by low power consumption. The tetrodes of the models are applied to two contacts. If we consider a simple amplifier circuit, then the filter is installed behind the thyristor. The capacity of the expander must be at least 8 pF. The output sensitivity is about 4.5 mV. In this case, it is allowed to install open type capacitors on the microphone amplifier with AGC. In total, the model requires three scalar transistors. Expanders in the model are installed in a sequential order.

Models for Canyon studio microphones

For studio models, the microphone amplifiers (shown below) are based on a pulse modulator. In total, two transceivers are required for the assembly. Condensers are used with output contactors. The minimum output sensitivity is 2 mV. In this case, the trigger is allowed to be used without insulators. The filter is installed in an absorbing type. On average, the threshold voltage in amplifiers of this type is 12 V.

Models for condenser microphones "Defender"

The amplifier on the microcircuit for capacitor microphones consists of field resistors. To solve problems with the conductivity of the signal, ray tetrodes are used. In this case, the triggers are used both as a pulse and as an operational type. Modulators are installed with low conductivity. The output sensitivity parameter is no more than 5 mV. Expanders in this case are allowed to be used with a capacity of up to 4.2 pF. Models with chromatic expanders are infrequent.

Amplifier for the electret type microphone "Sven"

The microphone amplifier for the electret microphone is folded on the base of the through capacitors. In the standard circuit of the device there are three resistors. They are installed in a sequential order. The signal conductivity index in them is about 8 microns. In this case, the output sensitivity parameter is around 3.3 mV. Thyristors for a microphone amplifier for an electret microphone are selected without contactors. Triggers are most commonly used by the low-frequency type. Next to the filter is a tetrode. The expander for models is suitable with a small capacity. Modulators are most often installed behind the trigger.

Model for microphones Esperanza

Amplifiers for these microphones are made of one-act type. Capacitors for models are field. Resistors are most often installed with contactors. In total there are three expanders in the circuit. Their capacity is 4.5 pF. In this case, the output sensitivity does not exceed 8 mV. Triggers for devices are selected for three contacts.

The minimum threshold voltage parameter is 12 V. Filters for devices are suitable only for the absorbing type. They must be installed next to the modulator. Direct contactors in devices are used with low conductivity of the signal. Due to this, it is possible to solve the problem with negative polarity.

Microphone Device Trust

The microphone amplifier on the chip for this model is added to the base of the through capacitors. A total of two resistors are required for the device. They are required to install along with the filters. For self-assembly of the amplifier you need an expander. Many experts believe that the maximum resistance in the circuit must be 50 Ohm.

In this case, the trigger is not strongly overheated. The contactors for the model are of an open type. In some cases, amplifiers contain two-bit triggers. Such devices are referred to as push pull type. In this case, the modulators are installed without insulators. The transceiver is allowed to be used with a regulator. Filters are installed as standard in an absorbing type. On average, the output sensitivity parameter in the circuit is 3.5 mV.

Plantronics microphone amplifier

A simple microphone amplifier for this model contains field resistors. In total there are two pairs of capacitors in the circuit. They are installed with an expander. The transceiver is allowed to use a dipole or a pulsed type. If we consider the first option, then the expander capacity should not exceed 5 pF. In this case, the trigger is used with the contactor. Isolators for amplifiers are installed behind the capacitors.

If we consider a modification with a pulsed element, then the trigger is of the three-digit type. Filters in this case are applied with a mesh cover. All this is necessary in order to solve problems with negative polarity. Directly thyristor is installed behind the modulator. The capacity of the expander must be at least 5 pF.