Medium Power Linear and Switching Applications• Complement to BD136, BD138 and BD140 respectively
New link in the calculators and converters page abot the hysterisis of an opamp as a comparator.
The circuit has been made for the creation of a symmetrical voltage that would come from a single power supply.
The circuit is providing the possibility the possibility of producing a symmetric voltage as required for some applications. This will always come from the existing single power supply of the circuit which is made possible by the use of IC1 L165. The voltage output is symmetrical in nature compared to the normal output.
The following programs calculate the relevant currents and voltages for various switch mode power supplies and display these graphically. Furthermore the programs give suggestions for appropriate choking coils and high frequency transformers.
For a Light Emitting Diode to emit any form of light it needs a current to flow through it, as it is a current dependant device. As the LED is to be connected in a forward bias condition across a power supply it should be current limited using a series resistor to protect it from excessive current flow. From the graph above we can see that each LED has its own forward voltage drop across the PN-junction and this parameter, which is determined by the semiconductor material used, is the forward voltage drop for a given amount of forward conduction current.
The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a
linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the
LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation
of the whole system from less than 3V.
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