Rs232 Voltage Regulator - with an input voltage of 9 v the voltage drop across r2 will be 3 3v and so a current of 2 2 181 a will ow transistor t3 multiplies this current by 220 to 0 5 ma which is p div class b factrow b twofr div class b vlist2col ul li div author extreme circuits div li ul ul ul div div div li with an input voltage of 9 v the voltage drop across r2 will be 3 3v and so a current of 2 2 181 a will ow transistor t3 multiplies this current by 220 to 0 5 ma which is there are many small applications where it would be preferable to power a device directly from an rs232 v 24 interface avoiding a mains power supply this article briefly describes the voltage regulator rs232 this principle is easy to understand but also very practical depth understanding of circuit elements you can better grasp this principle an output voltage of 5 v from an input voltage of at least 8 v and a short circuit current of 19.

ma the current drawn by the regulator itself is only 0 2 ma rs232 features and specifications rs232 uses asynchronous munication so no clock is shared between pc and modem logic 1 on pin is stated by voltage of range 15v to 3v and logic 0 on pin is stated by voltage of range 3v to 15v the usb uart bridge connects uart ponents with an usb host the bridge generates a 3 45v voltage from usb this can be used to supply the microcontroller





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