USB-COM adapter with your own hands: circuit. How to choose the right USB-COM adapter

The COM USB adapter is a device that allows a personal computer to connect to various peripheral equipment. Unfortunately, modern models of system blocks do not have very important outputs at times. Thus, the user is limited in his capabilities.

If you consider a device such as a receiver, it can not be connected to the cable. In this case, only the adapter (adapter) can help the user. By the type of connectors, these devices differ. In addition, it should be noted that it is quite possible to make them at home. However, first of all it is important to familiarize yourself with their device.

Simple Adapter Circuit

The USB-COM adapter circuit includes a port, a modulator, a converter, and a resistor. In some cases, an amplifier may be located on the board. In this case, most often selected are wired models. Resistors in this case are only used in an open type. This is necessary in order to increase the limiting frequency of the device. Thus, the response time of the signal will be in the region of 20 ms. Among other things, consider the width of the device. To increase this parameter, many modulators recommend using only two-sided ones.

Type A standard models

Make a type A USB-COM adapter with your own hands at home is quite simple. The chip in this case is more suitable to choose the type PP21. Stabilize the process in the device will help only the converter. To work properly, the model also requires a high-quality modulator. For the specified microcircuit it is necessary to select only low-frequency type. All this will allow the parameter of the response of the signal to be kept at 30 ms.

For better current conductivity, experts also recommend using low-power transistors. In this case, they have to withstand the limiting voltage at the level of 3V. In general, these adapters are excellent for various types of receivers. In addition to them, you can connect radios with connectors type SR101.

Models of type A mini

Adapters of this type are capable of supporting many formats. Without converters, they can not be folded. In addition, it will be necessary to choose a PP22 series chip. Total transistors on it should be located three. In this case, two of them must be placed near the converter. The modulator in this case is important to select the impulse type. The average signal response rate is about 30 ms. For stable operation of the peripheral device this is quite enough.

The cable in this case must be fastened to the back of the chip. It is important not to touch the modulator during the soldering process. Transistors also need to be kept clean. Coupling of circuits is provided due to the cascade of frequency amplification. On average, this parameter fluctuates around 12 Hz. To improve the conductivity of current, some experts recommend using amplifiers. The port for the device is connected last. The driver for the USB-COM adapter is selected separately.

Type A micro models

Make a type A micro USB-COM adapter with your own hands is quite difficult. This is largely due to the presence of a non-standard port. Bandwidth for it should be provided quite high. In this case, the response parameter of the signal must be at least 20 ms. Separately, you should pay attention to the search for a converter.

To increase the clock frequency in the device, many of them are selected in a symmetrical type. In this case, the transistors are selected in the open modification shop. On average, they can withstand a voltage of 3A. As an option, you can consider the combined subspecies. All this will ultimately improve the speed of the signal response.

How to make an adapter of type B standard?

The proposed USB-COM adapter cable is being assembled for devices that have a RSR21 type connector. First of all, you need to choose a modulator in the store. In this situation, you can stop on the stepped analog. However, the bandwidth is rather low. Also in the future, there may be some problems with overlapping contours. To solve the presented problem, it is possible to use oscillatory modulators.

They cost the market quite expensive, but the testing of devices shows that they are very good. First of all, they are distinguished by the presence of copper contacts. Thus, the conductivity of the current is high. Among other things, with a chip type PP20 it works quite well. The port in this case must be installed last. In this case, the cable for it is selected separately.

Type B mini adapters

This COM USB adapter is assembled using a PP220 chip. In this case, the transducer must be selected with a chromatic resistor. In addition, it is important to use only a high-frequency modulator. To increase the speed of the response of the signal, many experts recommend using open-type transistors.

However , the bandwidth of the device will be significantly reduced. As a result, there may be a problem with installing the device driver. Additionally, a USB Trigger Trigger is mounted on the USB-COM adapter. This element in the system is responsible for conjugation of circuits. This process occurs in a grid triode. The amplification of the frequency increases significantly. The port for the adapter is selected without a selector.

Model type B micro

Adapters of the type presented are collected quite simply. First of all, it should be noted that they are quite popular today. They are suitable for all devices on which there is a connector type RSR 23. Converters are selected on a chip only impulse type. In this case, the transistors are best to use the standard ones. However, many specialists still give their preference to open-type analogs.

The bandwidth parameter in this case will depend on the type of amplifier. If you use a low-frequency modification, then the device's problems are inevitable. In turn, longitudinal modifications significantly increase the current throughput parameter. The cable in this case is soldered to the convection output of the microcircuit.

How to choose a model in the store?

For devices with a connector type RSR21 adapter should be selected high-frequency. Minimum load, it must withstand at a level of 3 A. Copper conductors must be necessarily anoxic. In this case, you can count on a good bandwidth of the device. Digital formats adapter is required to support Dolby and Tru.

In turn, the video system should work with 720p. Amplifiers in devices, as a rule, are installed without contact. However, some models have cheaper analog versions. The outer shell of the model should be made of polyvinyl chloride. The parameter of the signal response rate is about 30 ms on the average. A quality adapter will cost around 2500 rubles.

USB mini 4P specifications

The specified USB-to-COM adapter (adapter) differs from other devices in that the modulator is a two-way type. Due to this, the bandwidth is quite good. For audio devices, this model fits perfectly. Traverse in this case is installed in between. To stabilize the signal, a high-frequency amplifier is used in the device. The parameter of the response speed of the model signal is at the level of 25 ms. On average, the frequency of the device is located at 23 Hz. To correct the current in the adapter, there is a small reflector.

Model USB 1394B

Adapters of this type are able to boast a rather high speed of the signal response. The converter is low-frequency in this case. In turn, the modulator is set at the limiting frequency at 23 Hz. All this allows you to quickly stabilize the input voltage. Main format support is provided by installing the device driver. The amplifier is in this case an impulse type. In turn, high throughput became possible due to an increase in the generation parameter.

The disadvantages of this adapter include a low overlap range. In connection with this, there are often conflicts with the system when connecting peripheral devices. In addition, it should be borne in mind that the chip in the model is installed in the PP19 series. Due to this, the intermediate frequency parameter never exceeds 30 Hz.

USB device TDK

This USB-COM adapter is most suitable for connection to a personal computer of receivers, in which the connector is installed of type RSR30. The transducer in this case is used for high sensitivity. In this case, the chip is installed meridional. The modulator is connected to it with an operating frequency of 28 Hz. High bandwidth in the device is provided by high-quality transistors.

It should also be noted that the deviation in the converter is quite rare. However, there are disadvantages with this adapter. First of all, they are related to wave distortion. As a result, the synchronization of the device can take a lot of time from the user.

USB-COM RS232

The USB-COM RS232 adapter is used to connect devices with RSR21 type connectors. In this case, the high quality of the modulator deserves special attention. The chip is used in the device type PP21. Transistors in this model are installed analog type. They do not differ in special bandwidth. However, the response rate parameter of the signal presented by the adapter is at the level of 30 ms. In many respects this was achieved by installing a powerful converter.

The operating frequency in the system can be maintained at 23 Hz. Contacts in this case are copper. All major formats are supported by the system. The driver for the USB-COM adapter can be purchased from the manufacturer. The outer shell of the device is made entirely of polyvinyl chloride. In addition, it should be noted that the parameter of the limiting frequency is exactly 30 Hz. In this regard, the bandwidth of the device is quite high.

USB Modification MINI8M

This COM (port USB) adapter is suitable for devices with a RSR26 series connector. In particular, these models are actively used to connect receivers to personal computers. Additionally, the modification can be installed in laptops. In dimensions it is very compact. The outputs on the chip are provided by the manufacturer coaxial type. The sensitivity of this model does not differ from other devices. In addition, it should be noted that the operating frequency parameter is at a 21 Hz drop.

In this case, the conductivity of the resistors is not very high. As a consequence, the response rate of the signal is on average 20 ms. The intermediate frequency of the model is 33 Hz. The modulators in this adapter are thermo-optical. The wave distortion in them occurs quite rarely. In addition, it should be noted that the presented adapters often suffer from an elevated temperature. You can use them at a maximum of 40 degrees.

USB MINI8P options

This COM ( USB port ) adapter is most often installed under different receivers. The operating frequency is exactly 25 Hz. At the same time, the response rate of the signal is at the level of 40 ms. The converter is used in this case by the manufacturer of a non-chromatic type. Its capacity is rather weak. However, the load can withstand about 3 A. Due to this, the stability of the operation is ensured at a good level, and the transistors in the device burn out rarely. Among the shortcomings is the sharp increase in the clock frequency. This is due to the dissynchronism of the modulator.

Devices with connector on the controller

USB-COM adapter with a connector on the controller is considered quite popular today. Microchips for it can be selected a variety. As a rule, converters are installed low-frequency. This is due to the fact that the response rate of the signals in the models is good. Modulators for adapters of this type are only meridional. All this leads to an increase in the limiting frequency to 30 Hz. However, the stability of the device can be controlled by installing an amplifier on the model.

Models with a connector at the peripheral device

Adapters with a connector at the peripheral device are not much in demand. First of all, they are absolutely not like laptops. In addition to the chips, only the PP13 series can be used. All this, in the long run, entails a number of problems. First of all, we should note the low intermediate frequency parameter at the level of 10 Hz. This is due to the lack of an input resistor on the board.

Also, problems with such models often arise because of a sudden voltage drop. This occurs when the load on the converter exceeds 3 A. However, despite all the above disadvantages, the adapters with a connector at the peripheral device are still useful when it comes to connecting equipment with the output of the RSR24.