A microphone amplifier is a device that increases the conductivity of a signal. This process is provided by the conductors. The standard model includes capacitors as well as thyristors. Modulators in amplifiers are installed in various types.
To increase the sensitivity of conductors, tetrodes are used. Extenders are installed in various capacities. Contactors are used to maintain a stable voltage in the circuit. In order to learn more information about devices, you should consider specific types of microphone amplifiers.
Single-cycle modification scheme
Single-ended microphone amplifiers (the circuit is shown below) are made on the basis of wired capacitors. In this case, the trigger is selected with a high conductivity of the signal. Many models use two resistors. If we consider a low-power amplifier, then it has one filter installed.
Thyristors are directly used without a conductor. Transceivers for models are installed behind expanders. The output sensitivity index fluctuates 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.
Push-pull model
The push-pull amplifier on the chip is made with field capacitors. Extenders for models are used in various 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 at the insulators is 12 V. It is easy to make this type of microphone amplifier with your own hands. For this, a chip of the PP20 series is selected. A direct expander is required with a capacitance in the region of 6 pF. A thyristor is also installed with capacitors. The signal conductivity in this case must be at least 2.2 microns.
Three-stroke amplifier device
Three-stroke microphone amplifiers (circuit 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 a microphone amplifier with your own hands. For this, a multichannel type microcircuit is primarily taken. An amplifier will also require an expander with a capacitance of about 2.3 pF. If we consider a simple model, then the filter is allowed to use the absorbing type. The parameter of current overload should average no more than 6 A.
How to make a model with a common emitter do-it-yourself
Microphone amplifiers (circuit 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, a thyristor is prepared for assembly. Install it follows the trigger. The output sensitivity of the element should be no more than 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.
Collector device
Collector amplifiers are well-suited for studio microphones. Capacitors in models are pulse type. There are three resistors in the circuit. The output sensitivity parameter averages 5.6 mV. In this case, the trigger uses a two-bit or three-bit type. If we consider the first option, then the expander is selected with a capacity of up to 5 pF.
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-digit trigger, then the expander is used with a capacity of more than 5 pF. Capacitors are installed only vector type. In total, three modulators will be required for the model. The minimum output voltage is 15 V. Filters are used to stabilize the threshold current.
Devices with AGC (automatic gain control)
Amplifiers with AGCs have recently been quite in demand. First of all, they are characterized by low power consumption. Tetrodes for models are used on two contacts. If we consider the circuit of a simple amplifier, 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 a microphone amplifier with AGC. In total, the model will need three scalar transistors. Extenders for the model are installed in sequential order.
Models for Canyon Studio Microphones
For studio models, microphone amplifiers (the circuit is shown below) are made on the basis of a pulse modulator. In total, assembly will require two transceivers. Capacitors are used with output contactors. The minimum output sensitivity is 2 mV. In this case, the trigger can be used without isolators. The filter is installed absorbing type. On average, the threshold voltage in amplifiers of this type is 12 V.
Models for Defender Condenser Microphones
The amplifier on the chip for condenser microphones consists of field resistors. To solve the problems with signal conductivity, beam tetrodes are used. In this case, triggers are used both pulse and operational type. Modulators are installed with low conductivity. The output sensitivity parameter is not more than 5 mV. In this case, expanders are allowed to be used with capacities up to 4.2 pF. Models with chromatic expanders are not common.
Amplifier for microphone electret type "Sven"
The microphone amplifier for the electret microphone is based on the passage capacitors. The standard device circuit has three resistors. They are installed in sequential order. The signal conductivity index for them is about 8 microns. In this case, the output sensitivity parameter fluctuates around 3.3 mV. Thyristors on a microphone amplifier for an electret microphone are selected without contactors. Triggers are most often used low-frequency type. Next to the filter is a tetrode. The extender for models is suitable with a small capacity. Modulators are most often installed behind a trigger.
Model for microphones Esperanza
Amplifiers for these microphones are manufactured in a single-act type. Capacitors in the models are used field. Resistors are most often installed with contactors. In total, there are three expanders in the circuit. Their capacitance value is 4.5 pF. In this case, the output sensitivity does not exceed 8 mV. Triggers for devices are selected on 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. Directly contactors in devices are used with low signal conductivity. Due to this, it is possible to solve the problem with negative polarity.
Trust Microphone Device
The microphone amplifier on the microcircuit for the specified model is based on the passage capacitors. In total, the device will need two resistors. They must be installed together with filters. For an independent assembly of the amplifier, an expander is required. Many experts believe that the maximum resistance in the circuit must be 50 ohms.
In this case, the trigger does not overheat much. Contactors for the model are suitable for open type. In some cases, amplifiers contain two-digit triggers. Such devices belong to the push-pull type. In this case, modulators are installed without isolators. The transceiver may be used with a regulator. Filters are installed as standard absorbing type. On average, the output sensitivity parameter in the circuit is 3.5 mV.
Microphone Amplifier Plantronics
A simple microphone amplifier for this model contains field resistors. In total, the circuit has two pairs of capacitors. They are installed with an expander. The transceiver is allowed to use a dipole or pulse type. If we consider the first option, then the capacity of the expander should not exceed 5 pF. In this case, the trigger is used with a contactor. The insulators on the amplifiers are installed behind the capacitors.
If we consider a modification with a pulsed element, then the trigger uses a three-digit type. Filters in this case are applied with a mesh lining. All this is necessary in order to solve problems with negative polarity. The thyristor is installed directly behind the modulator. The capacity of the expander should be at least 5 pF.