Tuesday, December 8, 2009
50 Watt Rms Audio Amplifier
In skame series of images below presented the series of power amplifiers with 50 watts rms amplifier using NPN and PNP transistors 2n is 2n 7391 and 3055. if the scheme is not clearly visible Kilik so please double picture more clearly visible
Note:
- Transistor Q3 and Q4 must be in pairs with the heatsink.
- Use a well regulated and filtered power supply.
- Connect a 10K POT in series with the input as volume control if you need.Not shown in circuit diagram.
List Component:
R1 1 200 Ohm 1/4 W Resistor
R2 1 200K 1/4 W Resistor
R3 1 30K 1/4 W Resistor
R5 1 1K 1/4 W Resistor
R6 1 5K 1/4 W Resistor
R7,R10 2 1 Meg (5%) 1/2 W Resistor
R8,R9 2 0.4 Ohm 5 W Resistor
R11 1 10K Pot R12,R13 2 51K 1/4 W Resistor
R14 1 47K 1/4 W Resistor
C1 1 100uF 35V Electrolytic Capacitor
C2 1 0.011uF Capacitor
C3 1 3750pF Capacitor
C4,C6 2 1000pF Capacitor
C5,C7,C8 3 0.001uF Capacitor
C9 1 50pF Capacitor
C10 1 0.3uF Capacitor
C11,C12 2 10,000uF 50V Electrolytic Capacitor
U1,U2 2 741 Op Amp
U3 1 ICL8063 Audio Amp Transister Driver thingy
Q1 1 2N3055 NPN Power Transistor
Q2 1 2N3791 PNP Power Transistor
BR1 1 250 V 6 Amp Bridge Rectifier
T1 1 50V Center Tapped 5 Amp Transformer
S1 1 SPST 3 Amp Switch S2 1 DPDT Switch
F1 1 2 Amp Fuse
SPKR1 1 8 Ohm 50W Speaker
.
GAMBAR NOKIA X3
Nokia X3 is a mobile phone that combines stereo speakers and enough storage capacity with a 3.2 megapixel camera. With such a complete specification, when Nokia X3 marketed at a price of 1.8 million, this phone tergolog cheap.
The Nokia X3 is a sleek and stylish slide phone with dedicated music and volume keys to control your sounds. It also has a combined send/end key and camera-shutter key for quick and easy operation. The design also features lighting effects around the dedicated ‘Navi’ key.
Priced for mass-market appeal, it is the first S40 device - the classic Nokia interface loved by millions - to offer direct access to Ovi Store. Using the store’s catalogue of applications no two X3’s need ever be the same.
As one of Nokia’s ‘Comes With Music’ devices the X3 enables users to discover, download and keep any and every track they want from the millions available in the Nokia Music Store*. The Nokia X3 also supports side-loading from PC - and comes pre-loaded with sample audio tracks and music videos from leading artists.
On top of a great music experience, the Nokia X3 offers a full set of features including a 3.2 megapixel camera, video recording and editing, email and instant messaging, web-browsing, and navigation with Nokia Maps. It even comes pre-loaded with the Guitar Rock Tour mobile game from Gameloft.
SPECIFICATION
- Size: 96 x 49.3 x 14.1 mm
- Display: 2.2 inch QVGA (240 x 320 pixels) with up to 262K colors
- Camera: 3.2 megapixels with full focus and 4x zoom
- Video recording at QVGA quality 30 frames-per-second
- Memory: Up to 46 Mb user memory and supports up to 16GB MicroSD
- Data Connectivity: GPRS/EGPRS, 3GPP Rel 4, GSM Quadband
- Talk time: Up to 7.5 hours
- Stand-by time: Up to 380 hours
- Music playback: Up to 26 hours
Monday, December 7, 2009
Audio Amplifier with Bass-boost
As the amplifier circuit is also used to move a number of frequency loudspeaker, the volume of the bass frequencies will be reduced. Therefore it is necessary to set the bass-boost controls on fedback loop amplifier, this is done to address the decline in quality. Graph bass can reach a maximum of +16.4 dB @ 50Hz.
Note:
This circuit can be connected directly to a CD player, tuner, and tape recorders.
Transistor Q3 and Q4 must be in pairs with the heatsink.
List Component
P1 : 22K Log Potemsiometer (Dual gang for stereo)
C3, 4 : 470uF/25V
P2 : 100K Log Potemsiometer (Dual gang for stereo)
C6 : 47pF 63V ceramic ar polyester capasitor
R2, 4, 8 : 820R 1/4W
C7 : 10nF 63V polyester capasitor
R1 : 4K7 1/4W
C9 : 100nF 63V polyester capasitor
R3 : 500R 1/2W
D1 : 1N4148 75V 150mA Diode
R5 : 82K 1/4W
IC 1 : NE5532 Low noise Dual Op-amp
R6, 7 : 47K 1/4W
Q1 : BC547B 45V 100mA NPN Transitor
R9 : 10R 1/2W
Q2 : BC557B 45V 100mA PNP Transitor
R10 : 0,22 4W(wirewound)
Q3 : TIP42A 60V 6A PNP Transistor
C1, 8 : 470nF 63V polyester capasitor
Q4 : TIP41A 60V 6A NPN Transistor
C2, 5 : 100uF/25V J1 : RCA audio input socket
.
150W amplifier circuit car is equipped with Active Crossover and this circuit using the chip that has a 4-channel power amplifier. Active Crossover function is used to separate the tone of the bass, midrange and treble, the output of direct Active Crossover can be strengthened by the power amplifier.
Power Chip 4-channel amplifier in use is SANYO LA47536 output with output power up to 150W, whereas for Active Crossover using LF353 from National Semiconductor.
Block diagram car audio amplifier system
Rangkaian Three band car audio active crossover
Rangkaian car audio amplifier 4 chFeatures :
- Internally trimmed offset voltage: 10 mV
- Low input bias current: 50pA
- Low input noise voltage: 25 nV
- Low input noise current: 0.01 pA
- Wide gain bandwidth: 4 MHz
- High slew rate: 13 V/us
- Low supply current: 3.6 m
- High input impedance: 1012.
- Low total harmonic distortion : <>
- Low 1/f noise corner: 50 Hz
- Fast settling time to 0.01%: 2 us
Maximum supply voltage
- VCC max1 No signal, t = 1 minute 26 V
- VCC max2 With an input signal applied 18 V
Allowable power dissipation Pd max: 50 W
Operating temperature: –40 to +85 °C
Storage temperature: –40 to +150 °C
Source
GAMBAR NOKIA N900
The most powerful ability possessed was multitasking capabilities that resembles the PC / desktop so that we can easily switch from one application to another application. So if you are already familiar with the Alt-Tab in Windows will better understand the advantages of this phone.
SPESIFIKASI NOKIA N900
Processor: ARM's Cortex-A8 600MHz
Display: 3.5-inch 800 × 480 resolution WVGA touch screen (this screen udah spt)
Keyboard: QWERTY row 3
Network: quad-band GSM / EDGE 900/1700/2100MHz and WCDMA / HSPA
Connectivity: Wifi, GPS / aGPS, FM Transmitter, Bluetooth 2.1 with A2DP
Camera: 5Megapixel with Carl Zeiss optics equipped with dual LED Flash and video capture (848 × 480 pixels @ 25fps)
Memory: 1Gb (uda ga lose with netbooks)
Memory storage: 32Gb
Multitasking: yes
Browser: Mozilla technology and support for Adobe Flash 9.4
Price: USD 710 (Harga 7 juta rupiah)
3.5mm audio jack with TV-out
Launch time: October 2009
Saturday, December 5, 2009
AC Line Current Detector
This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detected by passing one of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800 turns of #30 - #35 magnet wire. The pickup could be made from other iron type rings or transformer cores that allows enough space to pass one of the AC lines through the center. Only one of the current carrying lines, either the line or the neutral should be put through the center of the pickup to avoid the fields cancelling. I tested the circuit using a 2 wire extension cord which I had separated the twin wires a small distance with an exacto knife to allow the U-bolt to encircle only one wire.
more
A Unique Discrete Zero-Crossing Detector
A zero-crossing detector delivers an output pulse that synchronizes other circuitry to the transitions through zero volts of a sinusodial source for both polarity excursions. This detector, which was developed to operate from the ac power line, includes a unique negative-voltage detector/level shifter
more
AC Line Sensing – Zero-Crossing Detector
The circuit I came up with is very inexpensive and works as follows. The AC line goes through some resistors to limit the current. The resistors are shown as two parts in parallel, but this is just to split the power between them since they may get a bit warm. The AC voltage goes into a bridge rectifier.
more
AC Current Indicator Light Circuit
This circuit could be wired into a 120vac power line, which feeds power to any load, ranging from 40 watts to 250 watts. It will turn on a LED light whenever current is being drawn by a load. It is especially useful for remote lights, where you may not be able to see if the lamps are receiving power.
more
Method and system for line current detection for power line cords
spects for detecting current flow in a power line cord are described. In these aspects, a line current detector circuit is provided for each input plug line of a power distribution box. A determination of whether line current is flowing in a system line cord plugged into the power distribution box is based on a light indicator from the line detector circuit. The line current detector circuit includes a magnetic device for detecting line current flowing in a power line cord, and a light emitting diode (LED) coupled to the magnetic device for outputting a light indicative of whether current is flowing in the power line cord.
more
AC Line Current Detector
This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detected by passing one of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800 turns of #30 - #35 magnet wire. The pickup could be made from other iron type rings or transformer cores that allows enough space to pass one of the AC lines through the center. Only one of the current carrying lines, either the line or the neutral should be put through the center of the pickup to avoid the fields cancelling. I tested the circuit using a 2 wire extension cord which I had separated the twin wires a small distance with an exacto knife to allow the U-bolt to encircle only one wire.
more
A Unique Discrete Zero-Crossing Detector
A zero-crossing detector delivers an output pulse that synchronizes other circuitry to the transitions through zero volts of a sinusodial source for both polarity excursions. This detector, which was developed to operate from the ac power line, includes a unique negative-voltage detector/level shifter
more
AC Line Sensing – Zero-Crossing Detector
The circuit I came up with is very inexpensive and works as follows. The AC line goes through some resistors to limit the current. The resistors are shown as two parts in parallel, but this is just to split the power between them since they may get a bit warm. The AC voltage goes into a bridge rectifier.
more
AC Current Indicator Light Circuit
This circuit could be wired into a 120vac power line, which feeds power to any load, ranging from 40 watts to 250 watts. It will turn on a LED light whenever current is being drawn by a load. It is especially useful for remote lights, where you may not be able to see if the lamps are receiving power.
more
Method and system for line current detection for power line cords
spects for detecting current flow in a power line cord are described. In these aspects, a line current detector circuit is provided for each input plug line of a power distribution box. A determination of whether line current is flowing in a system line cord plugged into the power distribution box is based on a light indicator from the line detector circuit. The line current detector circuit includes a magnetic device for detecting line current flowing in a power line cord, and a light emitting diode (LED) coupled to the magnetic device for outputting a light indicative of whether current is flowing in the power line cord.
more
