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This is the circuit quality preamplifier with built-in USB DAC for my Leachamp power amplifier. Scheme is PCM2902 datasheet. Circuit includes DAC and ADC, SPDIF input and output of HID and with 3 buttons + MUTE, VOL-and VOL. For playback of high quality needed for external low-drop voltage stabilizer for the DAC. LP2951CM DAC is used, which was readily available in local stores. Output voltage is fixed at about 3.7 V with two resistors. Circuit board is designed with regard to the placement of good land, and the separation of digital and analog ground. These earth are connected in a single point in a USB connector. The PCM2902 data sheet is recommended to connect a low pass filter the DAC output to filter high frequencies above audioband produced by the conversion of oversampling. Digital integrated circuits that includes LPF filter frequency above 100 kHz. In the Notes application filter on the pages of the manufacturer recommends first-order LPF (simple RC) or 2 nd order with amp...

Description. Many automatic night light circuits had been published here. This one uses a photocell for detecting the light intensity. At full light the resistance of the photocell will be few ten ohms and at darkness it will rise to several hundred ohms. The IC1 uA741 is wired as a comparator here. At darkness the resistance of photocell increases and so the voltage at the inverting input of the IC1 will be less than the reference voltage at the non inverting input. The output of the IC1 goes to positive saturation and it switches ON the transistor to activate the relay. By this way the lamp connected through the relay contact glows. The diode D1 works as a freewheeling diode. Circuit diagram. Notes. The circuit can be assembled on a Vero board. Use 9V DC for powering the circuit. POT R7 can be used to adjust the sensitivity of the circuit. The relay K1 can be a 9V, 200 Ohm SPDT type. L1 can be a 230V,60W lamp. R8 can be a ORP 12 photocell.

This circuit equipped with 2 switches that are useful for loudness and filtering, on SW1 as the loudness , SW2 as a filter. It also equipped with direct  adjust of sound on Potentiometer 10k , but only useful as a master volume. Minimum Voltage  : 8 volts Maximum Voltage : 18 volts Maximum Power   : 2 X 13 Watt stereo Impedance Power  : 4 Ohms

This project provides some lighting effect by the blinking pattern of the bulbs connected at its output. Up to 8 Bulbs can be connected in between connector CN2 to CN9 and AC power to control them should be connected at Connector CN10. DC Power should be applied at Connector CN11 in accordance with the polarity marked on this connector. Care should be taken while using this it as it contains Main Power on the board. [ ]

Online mega-retailer Amazon may be planning to release an Android -based gaming console by the end of the year, if rumors prove correct. Citing "those ... who have knowledge of the in-development hardware," Game Informer claims Bezos & Co. may be readying the device to ship by "Black Friday" – the day after the US Thanksgiving holiday, traditionally the start of the holiday shopping season, which this year falls on November 29. Details of the plan are virtually nonexistent, but this isn't the first time El Reg has heard murmurs that Amazon may be planning to broaden its hardware line beyond its Kindle e-readers and tablets. In May, The Wall Street Journal reported that Amazon was operating a secretive facility in Apple's hometown of Cupertino, California, known only as "Lab 126," where it was working on at least four hush-hush hardware projects. Two of those were said to be Amazon -branded smartphones, a perennial topic of discussion among r...

This circuit employs the popular and easy to find LM3914 IC. This kind of IC is quite very simple to drive, requires no voltage regulators (it features a built in voltage regulator) and can be powered from almost every resource. This LM3914 IC based on Simple Battery Tester is very simple to explain: Once the test switch is pushed, the Car battery voltage is supply into a high impedance voltage divider. His function is to divide 12V to 1, 25V (or lower values to reduced values). This solution is much better than enabling the internal voltage regulator set the 12V sample voltage to be feed into the internal voltage divider simply because it cannot regulate 12V if the voltage falls lower (linear regulators only step down). Simply wiring with no change, the regulator provides secure 1, 25V which can be fed into the precision internal resistor cascade to create sample voltages to the internal comparators. In any case the default establishing let you to determine voltages between 8 and 12V...

Build a 15W Bridge Audio Amplifier Circuit based TDA2002. 15W bridge audio amplifier circuit which use 2 pieces of TDA2002. This is audio amplifier for general, work with a single power supply. Use 2A power supply transformer for maximum performance and heatsink should be used to keep the IC from overheating. Build a 15W Bridge Audio Amplifier Circuit based TDA2002 Component part list: R1-5 = 2.7? R2 = 100? R3-4 = 2.2? R6 = 220? R7 = 1M? TR1 = 100K? trimmer C1-9 = 10uF/16V C2-8 = 220uF/16V C3-4-5-7 = 100nF/63V C6=470uF/25V IC1-2=TDA2002 Lsp = 4 – 8?/40W Loundspeaker