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Sunday, August 10, 2014

USB to Serial Converter Home Made without Microcontroller IC - No need programming

USB to Serial converter home made without IC microcontroller or no need programming can realization using special IC for that. It is TF 232 BM. For more explanation will shown in this circuit:

At the PC side you need driver software (winxp and lower) but for win7 up no need driver.

Complete Circuit/Driver/Schematic can download at HERE

Most of today's PCs and notebooks began to leave the serial port and switch to USB. The use of USB is more practical because in addition to its speed higher, this port has a 5 volt voltage source that can be used to provide resources on an electronic system that is connected to it. While today most electronic devices are still using the port RS232 communication with PC media. To bridge these problems  so many products launched USB to RS232 which makes electronic devices is still detected as COM (RS232 port) on the PC or notebook. Old software that was previously still using COM does not need to be changed  again because the device is still considered to communicate with COM (Port RS232) But most of USB products on the market toRS232 still using 12 Volt +/- level on the microcontroller whereas RS232 can only use TTL level 0 / + 5Volt just so needed IC MAX232 again to communicate with this module. 

RS232 Converter production has TTL level 0 / + 5 volts on the RS232nya so it can be connected directly to the microcontroller system without using a MAX232.
Installation HOME MADE USB - Serial Converter:
- Connect the USB cable to a PC's USB port and USB port Home Made this circuit
- Power LED indicator will indicate the presence of active voltage source Module enters the This circuit
- Windows will ask for the driver of the module to be installed

Driver installation step by step:

To testing connection use Hyperterminal

Step Down Power Supply Up to 30A Output

This circuit is so simple for step down power supply with the one IC controller like this

Key Features

    • Fully-encapsulated dual step-down switching power supply
    • Up to 100W output from a 17mm square PCB footprint
    • Dual 15A or single 30A output
    • Up to 95% conversion efficiency
    • 4.5V to 20V input voltage range
    • 0.6V to 6V output voltage range
    • 1.5% output voltage accuracy with differential remote sensing
    • Up to six modules may be paralleled to support 180A output current
    • Output over-voltage, over-current and over-temperature protection
    • Full power operation without heat sinks or fans
    • QFN package with exposed leads permits easy probing and visual solder inspection


The ISL8225M is a fully-encapsulated step-down switching power supply that can deliver up to 100W output power from a small 17mm square PCB footprint. The two 15A outputs may be used independently or combined to deliver a single 30A output. Designing a high-performance board-mounted power supply has never been simpler -- only a few external components are needed to create a very dense and reliable power solution.

Automatic current sharing and phase interleaving allow up to six modules to be paralleled for 180A output capability. 1.5% output voltage accuracy, differential remote voltage sensing and fast transient response create a very high-performance power system. Built-in output over-voltage, over-current and over-temperature protection enhance system reliability.

The ISL8225M is available in a thermally-enhanced QFN package. Excellent efficiency and low thermal resistance permit full power operation without heat sinks or fans. In addition, the QFN package with external leads permits easy probing and visual solder inspection.


    • Computing, networking and telecom infrastructure equipment
    • Industrial and medical equipment
    • General purpose point-of-load (POL) power


If you need high voltage or more headroom, you can move to the ISL8240M dual 20A/single 40A step-down power module, which is pin-to-pin compatible with the ISL8225M, and is well suited for power hungry ASIC, FPGA and microprocessor loads in infrastructure systems. Current sharing and phase interleaving allow up to 6 modules to be paralleled for up to 240A of current. 

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