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General Description: The BA3853BFS is a dual-channel electronic volume controller built around a low-noise, low-distortion VCA. It is suited for car-audio applications, and has performance that rivals mechanical-type volume controllers. In addition to volume control, the IC includes all functions required for controlling sound quality, to allow more compact designs with far fewer components. Circuit diagram: Dual-channel electronic volume controller Datasheet for BA3853: Download

The Chinese company Gionee, known mainly for its thinnest smartphone Elife S5.5 and Elife E5.1, is preparing another interesting device. The device, made in unusual for modern smartphones clamshell, was seen on the website of the Agency for certification of Chinese telecommunications equipment (TENAA). This model will be the world's first smartphone equipped with two screens with a resolution of 1080p. Diagonal inner and outer screens is 4 inches. Given the resolution of 1080 x 1920 pixels it gives quite a high density of 550 ppi. The device runs on Android 4.4 KitKat, built on a quad-core processor with a clock speed of 1.5 GHz, equipped with a 13-megapixel main and a 5-megapixel front-facing camera, 2 GB of RAM and 16 GB of internal memory and supports network LTE. The thickness of the model is 14.8 mm, and weight - 172 grams. While nothing is known about when to begin selling Gionee W900 . In any case, the smartphone will be released in China and it is difficult to say whether h...

Description : This schematics is of dual power supply, having voltage output 3,5,6,9,12,15 and -3,-5,-6,-9,-12,-15. LM 317 is adjustable 3-terminal positive voltage regulator and LM 337 is adjustable 3-terminal negative voltage regulator. Switch S1 is for +ve and S2 is for -ve voltage respectively. Schematic: click on image to zoom Pin out: Components: All diode s are 1N4007 R1, R3 270 ohm R2 1K2 ohm R4, R10 390 ohm R5, R11 820 ohm R6, R12 1K ohm R7, R13 1K65 ohm R8, R14 2K35 ohm R9, R15 3K ohm LM317T LM337T C5, C8 2200uF 25v electrolyte C6, C7, C9, C10 22uF 25v electrolyte C1-C4 0.1uF Ceramic F1 0.5A fuse S Switch S1, S2 6-way rotary switch T1 Center taped transformer 15-0-15v 220v Red LED

This project involves constructing an energy efficient dual 3 Watt white LED array that runs on 12VDC at 700mA. The lamp is useful for indoor indirect room lighting. The light that is produced does not flicker and has a regulated brightness from 11V to the maximum operating voltage. The Avago 3W white LEDs are rated at 3 watts (nominal). Never stare directly at this lamp when it is running at full operating power, it is dangerously bright. Specifications: Nominal operating voltage: 12V DC Nominal operating current: 700 mA Maximum operating voltage: 16V DC Power consumption at 12.0V: 8.4W Minimum voltage for regulated light: 11V DC Leds produce light down to: 6V DC White LED voltage: 3.7V DC each White LED input power: 2.59 W each Voltage across regulator when current becomes regulated: 3.3V DC Theory: The lamp is wired as a current loop which includes the power supply, the LED series string and the 700 mA current regulator circuit. The LM317 and 1.8 ohm 5 Watt resistor act as a current...

A IC MAX634 inverting regulator is combined with a IC MAX630 to provide a dual tracking approximately 15 Volt output from a 12 Volt DC battery. The reference for the - 15 Volt output is derived from the positive output via R3 and R4. Both regulators are set to maximize output power at low battery voltages by reducing the oscillator frequency , via LBR, when V Batt falls to 8,5 volt. Technical instruction : Max. Input voltage    : 13 Volt / N/a mA Max. Output voltage :-15 Volt , + 15 volt / 45 mA

General Description: The AN7190NK and the AN7190NZ are audio power ICs developed for the sound output of car audio (dual 20 W). It is incorporating various protective circuits to protect the IC from destruction by GND-open, short circuit to GND and power supply surge which are the important subject of power IC protection, so the IC will largely contribute to a high reliability design of equipment. Also, it is incorporating a perfect muting circuit which is free from shock noise, so that a shock noise design under the set transient condition can be made easily using together with its standby function.  Circuit Diagram: Dual 20 Watt audio amplifier

This circuit alternately flashes 2 white LEDs, on a 3v supply and produces a really bright flash. The circuit produces a voltage above 5v if the LED isn't in circuit however the LED limits the voltage to its characteristic voltage of three.2v to 3.6v.   The circuit takes concerning 2mA and is actually a voltage-doubler (voltage incrementer) arrangement. The 1k charges the 100u and therefore the diode drops zero.6v to prevent the LED from setting out to illuminate on 3v. When a transistor conducts, the collector pulls the 100u down towards the 0v rail and therefore the negative of the electro is actually concerning 2v below the 0v rail. The LED sees 3v + 2v and illuminates terribly brightly when the voltage reaches about 3.4v.  All the energy within the electro is pumped into the LED to supply a really bright flash. DUAL 1v5 WHITE LED FLASHER This circuit alternately flashes 2 white LEDs, on a 1.5v supply and produces a really bright flash. The circuit produces a voltage o...

This circuit alternately flashes 2 white LEDs, on a 3v supply and produces a really bright flash. The circuit produces a voltage above 5v if the LED isn't in circuit however the LED limits the voltage to its characteristic voltage of three.2v to 3.6v.   The circuit takes concerning 2mA and is actually a voltage-doubler (voltage incrementer) arrangement. The 1k charges the 100u and therefore the diode drops zero.6v to prevent the LED from setting out to illuminate on 3v. When a transistor conducts, the collector pulls the 100u down towards the 0v rail and therefore the negative of the electro is actually concerning 2v below the 0v rail. The LED sees 3v + 2v and illuminates terribly brightly when the voltage reaches about 3.4v.  All the energy within the electro is pumped into the LED to supply a really bright flash. DUAL 1v5 WHITE LED FLASHER This circuit alternately flashes 2 white LEDs, on a 1.5v supply and produces a really bright flash. The circuit produces a voltage o...

Before we describe how it's done, note that we recommend that the result be checked as having sufficient brightness for a stop & tail-light application. That's because the light output may be inadequate, depending on the tail-light lens and reflector assembly - so use any modified lamps with discretion! As shown, an additional diode (D1) and resistor (68W) provide power from the "tail" circuit. Alternatively, when the "stop" circuit is powered, the resistor is bypassed by D2, thus increasing the LED current and the light output. Circuit diagram: Modifications to the lamp assembly instructions are as follows: After soldering in the copper tube but before soldering the platform board to the bayonet lamp base, the three components inside the dotted box must be wired up inside the base. The anode leads of the diodes can be soldered directly into the contacts ("bumps") on the base (a fine file or glass paper may be needed to get a nice round shape)....

3V / 35mW dual power amplifier