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Usb series player is an electronic device or electronic circuit that functions as an MP3 player that is stored on a storage device such as USB flash. In this usb circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone, or again through the power amlplifier strengthened so that it can be heard through the speakers. IC used in this circuit using IC PCM2902 as a modifier of a digital data into analog data storage. Below is a schematic diagram of a USB player. Schematic usb player

For those of you like / love to talk in the air can assemble this simple circuit that can be received by the radio receiver to within a few hundred feet. The voice that issues by this circuit at all clear without rustling. Can also be used to link communications over the air using this radio transmitter, provided that other person also had the same circuit. This PCB design : Description : Resistor R1__________________1K R2__________________18K R3__________________82K R4__________________1K2 R5__________________5K6 R6__________________39K R7__________________18K R8__________________68K R9__________________470R R10_________________100R R11_________________50K XTal Q1__________________ Crystal according to the desired frequency Inductor L1__________________10uH Capacitor C1__________________10uF C2__________________30uF C3__________________20uF C4__________________47uF Transistor Tr1_________________2SB175 Tr2_________________2SB175 Tr3_________________2SB178 Antenna X1-1________________...

Description  This design is derived from the Portable Headphone Amplifier featuring an NPN/PNP compound pair emitter follower output stage. An improved output driving capability is gained by making this a push-pull Class-A arrangement. Output power can reach 427mW RMS into a 32 Ohm load at a fixed standing current of 100mA. The single voltage gain stage allows the easy implementation of a shunt-feedback circuitry giving excellent frequency stability.  Tilt control:   The mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving bass lift and treble cut is obtained. The central position of SW1 allows a flat frequency response, whereas the third position of this switch enables a shelving treble lift and bass cut. Circuit Diagram:  Parts P1 = 22K Dual gang Log Potentiometer (ready for Stereo) R...

This Schematic use IC AN374, this is mono amplifier and have output speaker 1 W with impedance 8 Ohm . Supply need 8Volt to 16 Volt , this Schematic you can use current Voltage 12 V. And better use the stabilizer with 7812 let the voltage stabil. The Effect will be on the sound so smooth. See this Schematic below  and see datasheet IC AN734 : Datasheet IC AN374 Vcc                = 8-16 V Pout               = 1 W RL                  = 8 Ohm Ft                   = 50hz - 17Khz Icco                = 12 mA Package         = SIP2-10 Manufactered = MATSUSHITA

The LM1830 fluid detector IC from National Semiconduc tor is designed to be able to detect the presence of fluids using a probe. This chip requires a relatively high supply voltage and is not the most frugal power consumer. It is also quite specialised so unless you are buying in bulk the one-off price is not cheap. An alternative circuit show n her e uses a standard CMOS IC type 74HC14. It has the advantage of operating with a 3 V supply and consumes less than 1 µA when the alarm is not sounding, this makes it ideal for use with batteries. Water Alarm Schematic Circuit Diagram The 74HC14 has six inverters with hysteresis on their input switching thresholds. A capacitor (C1) and a feedback resistor (R1) is all that’s necessary to make an inverter into a square wave signal generator. In the water alarm circuit the feedback resistor consists of R1 and the water sensor in series. R1 prevents any possibility of short-circuit between the inverter’s input and out-put. Resistor R2 defin...

The schematic above is amplifier based on ic TA7211P or TA7212P , circuit above using OT transformer as a booster amplifier again. The amplifier suitable used on outside / field, because by using a transformer OT is identical to the PA amplifier. Part List : R  = 1K , 10R , 3K3 C  = 1uF , 10uF , 1n , 68u, 3u3, 2n2 x 2, 100u  IC = TA 7211P / TA7212P Technical information : Max Vcc = 15 VDC Min Vcc  = 4 VDC Po            = 3,4 W Rl            = 8 Ohm Icco         = 16 mA

This schematic very suitable applied on small speakers. Because the maximum output is 3W and the minimum voltage is 12 Volt  , this will make speaker does not damage quickly. If you use speaker with impedance 8 Ohm , you must make parallel circuit speaker don't use series circuit. See This Schematic and datasheet IC AN313 below : Datasheet IC AN313 Vcc                = 12-20 V Pout               =  2x3 W RL                  = 8 Ohm Ft                   = 40hz -18Khz Icco                = 40 mA Package         = TABS6-16 Manufactered = MATSUSHITA Or you can call , Datasheetnya IC AN313

This is a simple project of Smoggy Circuit Schematic . Even if your good old (Sony) Walkman  sees little use nowadays it would be a  shame to get rid of it altogether. The more  so when just removing the tape head  would allow the built-in audio amplifier  to become an outstanding electrosmog  detector for a variety of purposes. Looking at the schematic, readers with RF  experience will have no difficulty in recognising the diodes and coils of the two  detector-receivers, which serve to capture and demodulate RF signals. With its  coil of four turns (L2) one receiver covers the higher frequency range of the  electromagnetic waves, whilst the sec-ond detector takes care of the lower frequency range.  Circuit diagram : Simple Smoggy Circuit Diagram For this reason a coil with a  greater number of turns is required: L1 is  an RF choke of about 250 µH. The precise  value is not critical and it could equally be  220 ...

AOC  2116s - TC7CMADDLWA6NG - TC7CMADDLWA6NN Used semiconductors:  AN9945N-T1-PF – TEA1530AT – STP10NK70ZEP(FET)  SMPS and Back-light Inverter circuit diagram SCALER (LVDS) SMPS PWB-solder side Click on the pictures to magnify

This is HiFi amplifier use the IC TDA1111 . The circuit is quite easy to use, but the constraints on the IC is difficult to find my local region. If you have this IC , it is very suitable is made by this circuit. Minimum voltage on the circuit 6-Volt and a maximum of 20 volts. And voltage suitable for supply of 12 Volt. Maximum power output of 40 Watts with 4 ohms impedance, and frequncy of about 20Hz to 20kHz. See the circuit below :

Anyone experimenting or developing USB ported peripheral hardware soon be comes irritated by the need to disconnect and connect the plug  in order to reestablish communication with the PC. This process is necessary for example each time the peripheral equipment is reset or a new version of the firmware is installed. As well as tiresome it eventually leads to excessive contact wear in the USB connector. The answer is to build this electronic isolator which disconnects the peripheral device at the touch of a button. This is guaranteed to reduce any physical wear and tear and restore calm once again to the workplace.  Circuit image :   USB Switch Schematic Circuit Image The circuit uses a quad analogue switch type 74HC4066. Two of the switches in the package are used to isolate the data path. The remaining two are used in a classic bistable flip-flop configuration which is normally built using transistors. A power MOSFET switches the power supply current to the USB device....

This amplifier circuit based on IC TDA2612 produced by siemens , minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance.Frequncy response 20Hz to 20kHz. Quiescent current is 70 mA. This is a mono circuit amplifier. See circuit below :    You can use the circuit above at : Car Tuner Pre amp Head Pre amp Mic Personal Computer  Portable media Player etc. Some advantage of the circuit : Fairly high voltage Low noise sound output Easy to make Components are easy to find

This DC-to-AC inverter schematic produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4.  The 555 DC-to-AC Inverter Schematic The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave. Adjust the value of T1 to your voltage. Error fix: Pin 7 and 2 were reversed. Original pinout was correct. Parts List: R1 = 10K R2 = 100K R3 = 100 ohm R4 = 50K potmeter, Linear C1,C2 = 0.1uF  C3 = 0.01uF C4 = 2700uF Q1 = TIP41A, NPN, or equivalent transistor Q2 = TIP42A, PNP, or equivalent transistor  L1 = 1uH T1 = Filament transformer, your choice The output (in watts) is up to you by selecting different components. Input voltage is anywhere from +5V to +15Volt DC, ad...

This Circuit Use a IC BA515 for operation it. This is very simple Amplifier schematic , with only add 8 component , such as resistor and capacitor. Minimum voltage require 3 Volt , this also low voltage amplifier . And maximum voltage require 9 volt . Power output under 10 Watt with impedance 4 Ohm . This circuit is very suitable for small speakers . See schematic below : If the circuit above not working may cause as follows : - Check voltage on the circuit , wether or not the voltage. - Check wether the components are soldered onto PCB properly. - Check input and output   wether working or not. - Check input output cable , if there are disconnected , or a short circuit. Or input connected with ground.

Even if your good old (Sony) Walkman  sees little use nowadays it would be a  shame to get rid of it altogether. The more  so when just removing the tape head  would allow the built-in audio amplifier  to become an outstanding electrosmog  detector for a variety of purposes. Looking at the schematic, readers with RF  experience will have no difficulty in recognising the diodes and coils of the two  detector-receivers, which serve to capture and demodulate RF signals. With its  coil of four turns (L2) one receiver covers the higher frequency range of the  electromagnetic waves, whilst the sec-ond detector takes care of the lower frequency range. Simple Smoggy Circuit diagram: For this reason a coil with a  greater number of turns is required: L1 is  an RF choke of about 250 µH. The precise  value is not critical and it could equally be  220 µH or 330 µH. The outputs of both detector-receivers  are connected to the...

See this circuit below: Datasheet IC TDA2004 Vcc                = 8-18 V Pout               = 2X 12 W RL                  = 2 Ohm Ft                   = 20hz - 20Khz Icco                = 65 mA Package         = SIP1-11 Manufactered = SGS-ATES Other IC TDA2004 , In this circuit you can use the following IC : A2000V A2005V TDA2005 TDA2005M MPC2005 Or you can call Persamaan IC TDA2004

This Schematic Require voltage 9 - 18 Volt. Good voltage for this schematic is 12 V. This is Mono amplifier with output 5,5 Watt and impedance 8 Ohm. You can make this Circuit easily because i give simple and clear scheme. See this Schematic and Datsheet IC AN315 : Click to Enlarge Datasheet IC AN315 Vcc                = 9-18 V Pout               = 5,5 W RL                  = 8 Ohm Ft                   = 30hz - 18Khz Icco                = 28 mA Package         = SIP2-11 Manufactered = MATSUSHITA