DATASHEET and Circuit Diagram

The circuit diagrams the VFC32 connected as a frequency-to voltage converter. The VFC32 Frequency to Voltage Converter operates on a principle of charge balance, the oscilation processes a long term balance of charge or average current between the input signal current and the refference current.

VFC32 can be operated up to 500kHz, both voltage to frequency or frequency to voltage conversion ability, and used to be applied on FM analog signal mod/demod, integrating A/D converter, isolated data transmission, motor speed control and tachometer.

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The following circuit diagrams the new circuit as a resonant mode circuit that has been modified from dimming fluorescent applications. It uses IRS2530D Dimming Control IC and the output stage has been modified to drive LEDs instead of a fluorescent lamp.

This new LED Control Circuit is for non-isolated, off-line applications, and can drive one or many LEDs in series, can be easily scaled for different LED current levels, and utilizes soft-switching for good efficiency.

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The CA-55 converter can be used to your CARK-91 car kit with compatible Nokia phones and compatible mobile holders with a Pop-Port connector. Below is the image of CA55 Converter Installation Diagram (click to enlarge image).

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National LM3886 known as a high performance audio power amplifier which utilized Self Peak Instantaneous Temperature (SPiKe) protection circuitry, and provided an inherently, dinamically protected Safe Operating Area (SOA). With this SPiKe, the device are protected at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks, according to the datasheet.

This LM3886 capable of delivering 68W continuous average output power into 4 Ohm at VCC = ±28V, 38W continuous average output power into 8 Ohm at VCC = ±28V, 50W continuous average output power into 8 Ohm at VCC = ±35V and typically used in applications such component stereo, compact stereo, self-powered speakers, surround-sound amplifiers, and stereo TVs.

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We provide you with an article contain information about new backlighting system for Liquid Crystal Displays (LCDs) utilize RGB LED lightsources, an optical sensor and feedback controller. The aim of using optical feedback is a color stability over temperature, maintaining constant brightness, and controlling any color point or brightness required by the LCDs.

Within the article you will find section discuss about Main functional blocks of the backlighting systems, The understanding of xy coordinate and brightness y (colorimetry), Luxeon RGB lightsource, Typical LED performance in temperature/lifetime behaviour, LED output wavelength using pulse width modulation (PWM), the RGB backlighting system description (click figure to enlarge), Feedback controller (clipping, brightness, calibration), Photodiode sensor for averaging radiometric power, and Luxeon LED driver descriptions.

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Battery backup and battery charging are two modes of battery backup circuits. The circuit below shown a simple battery backup circuit using low treshold MOSFET device in order to gain better efficiency in addition of very low voltage drop resulted by the MOSFETs that will prolong battery life, and meet battery voltage limitations.

You require the following component selection to design this Battery Backup Circuit : 1N4001 Diodes (D1-D5), standard 1/4 watt, 5% tolerance Resistors, dual comparator LM393N for U1, 5 Eveready nickel cadmium cells battery in series, and TN0604N3 low threshold N-channel DMOS transistors for their low on-resistance at low gate drive. You can modify this circuit with an added features such as battery backup mode indicator, low battery voltage early warning, or battery shutdown indicator with a microprocessor in more complex systems.

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