Rangkaian 1,5V Earphones Audio Amplifier

This audio amplifier circuit, connected to 32 Ohm impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will be clearly heard. You can also listen to your television set at a very low volume, avoiding to bother relatives and neighbors. Even if you have a faultless hearing, you may discover unexpected sounds using this device: a remote bird twittering will seem very close to you.

Skema Rangkaian 1,5V Earphones Audio Amplifier

The heart of the circuit is a constant-volume control amplifier. All the signals picked-up by the microphone are amplified at a constant level of about 1 Volt peak to peak. In this manner very low amplitude audio signals are highly amplified and high amplitude ones are limited. This operation is accomplished by Q3, modifying the bias of Q1 (hence its AC gain) by means of R2.

A noteworthy feature of this circuit is 1,5V battery operation.
Typical current drawing: 7,5mA.

List Component

• P1: 22K Log. Potentiometer
• R1,R9: 10K 1/4W Resistors
• R2: 1M 1/4W Resistor
• R3: 4K7 1/4W Resistor
• R4,R7: 100K 1/4W Resistor
• R5: 3K9 1/4W Resistor
• R6: 1K5 1/4W Resistor
• R8: 100R 1/4W Resistor
• C1,C2: 100nF 63V Polyester or Ceramic Capacitors
• C3,C6: 1µF 63V Polyester or Ceramic Capacitors
• C4: 10µF 25V Electrolytic Capacitor
• C5: 470µF 25V Electrolytic Capacitor
• D1: 1N4148 75V 150mA Diode
• Q1,Q2,Q3: BC547 45V 100mA NPN Transistors
• Q4: BC337 45V 800mA NPN Transistor
• MIC1: Miniature electret microphone
• SW1: SPST Switch
• J1: Stereo 3mm. Jack socket
• B1: 1.5V Battery

Source

Rangkaian TDA1554 Audio Amplifier 2 x 22W BTL

Audio Amplifier Based TDA1554 IC

This audio amplifier circuit works up to 2 x 22Watt with main power IC TDA1554. The circuit has only very few components and works best with a 4 Ohm speaker.

IC TDA1554 must be connected to a heat sink. A computer cabinet fan can also be used in addition. Any way better the cooling better the performance.The circuit roughly draws 6A current at 12 V at full volume.So the power supply must be any thing more than 6A.Up to 18 V can be used

Skema rangkaian TDA1554 audio amplifier
2 x 22W BTL

List Componet

• R1 39K 1/4 Watt Resistor
• C1,C2 10uf/25V Electrolytic Capacitor
• C3 100uf/25V Electrolytic Capacitor
• C4 47uf /25V Electrolytic Capacitor
• C5 0.1uf /25V Ceramic Capacitor
• C6 2200uf/25V Electrolytic Capacitor
• U1 TDA1554 Two Channel Audio Amp Chip
• MIS Heatsink For U1

TDA1554 IC

TA8215 Car Audio Amplifier 15W BTL Stereo

Rangkaian TA8215 Car Audio Amplifier

This is circuit of 15W BTL stereo channel audio power amplifier based IC TA 8215 developed by Toshiba. In this power amplifier circuit, two TA 8215 ICs are used. This is for obtaining four channels that is two channels from each IC. TA 8215 is an IC with power amplifier stages and preamplifier integrated inside it.

The power supply required for this amplifier is single 12 V DC supply. The maximum output power delivered from each channel of this amplifier is 15 W to a 4 ohm speaker and hence the name 4×15 W power amplifier.

Skema rangkaian Car Audio Amplifier
15W BTL Stereo

TA8215 IC

R1 with R2 forms a voltage divider that attenuates the input signal by 24dB. Considering the chip's 50dB gain, that still leaves 26dB overall gain, slightly more than enough to fully saturate the amplifier when the sound card works at maximal output. C1 blocks DC at the preamplifier input. C2 is the ground return of the feedback circuit. These two capacitors need to be in the ratio shown, in order to suppress switching clicks when powering the circuit on and off. The output pins 15 and 16 are connected directly to the speaker, while C7, R6, C8 and R7 provide the proper load phase shifting to avoid high frequency instability.

The power supply is decoupled with a rather small 100uF capacitor. That's enough for higher frequency decoupling, and at lower frequencies anyway the large capacitors in the PC power supply are fine. Pins 10 and 17 supply the power amplifiers, while pin 9 provides power to the pre stages. This power is filtered by C3. The power control pin 4 allows to shut down the amplifier, an option not used here, so it's tied to 12V. Pin 1 is a muting input, also not used, and left open.

Rangkaian Audio Amplifier LM4780

Exploring power amplifier integrated circuit LM4780 from National Semiconductor.

What's so special? Well, first of all - a very low harmonic distortion. Usually, manufacturers indicate the maximum power of its regular ingenious handicrafts with the harmonic content of 10%. At the same chip, CT at the maximum specified power is only 0,5%! Thus, it is the most honest of all mikruha I encountered.

In the chip implements two identical amplifier channels and features are given for the stereo mode of the amplifier. Circuit can also operate in mono - in bridge inclusion. In this case, the output power at CT = 0.5% of 120 watts. Other features remain virtually unchanged.

Skema rangakain amplifier 60W stereo LM4780

Skema rangakain amplifier 120W Bridged LM4780

LM4780 IC Fiture

• Features SPiKe Protection
• Low external component count
• Quiet fade-in/out mute mode
• Wide supply range: 20V - 84V
• Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W)

LM4780 IC pin

Rangkaian TDA 1910 Audio Amplifier

This circuit is a simple audio amplifier based on TDA1910 IC. This circuit will deliver 10W power output if used 8 ohm loudspeaker and powered with 24V DC supply.

Skema rangkaian TDA 1910 audio amplifier

TDA 1910 IC Pin

Note

• Use 18-24V DC for powering the circuit.
• A proper heat sink is necessary for the IC.

The TDA 1910 IC is a monolithic integrated circuit inmultiwatt package, intended for use in Hi-Fi audio power applications, as high quality TV sets. The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

Maximun ratings TDA 1910 IC

• Supply voltage 30 V
• Output peak current (non repetitive) 3.5 A
• Io Output peak current (repetitive) 3.0 A
• Input voltage 0 to + Vs V
• Differential input voltage ± 7 V
• Power dissipation at Tcase = 90°C 2 0W
• Storage and junction temperature -40 to 150 °

Rangkaian 20 Watt Audio Amplifier TDA7240

Here is an audio amplifier based on the TDA7240 IC from ST Microelectronics. The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications

Skema rangkaian 20 watt audio amplifier TDA7240

TDA7240 IC Pin

This circuit of audio amplifier based IC TDA7240 can deliver 20 watts of audio output power into a 4ohm load. The IC has minimum external parts count and is available in the 7 pin compact Heptawatt package. The IC also has a lot of good features like loud speaker protection, short circuit protection, low noise, low distortion etc. The circuit can be operated from a 12V DC single power supply and this makes it very useful in car audio application

Note:

• Use 4 ohm, 20W speaker.
• S1 is the standby switch and S2 is the ON/OFF switch.
• LED D2 is a power ON indicator.
• give good cooling at TDA7240 IC
  

Model of Italian style and elegance Alfa Romeo Spider

Alfa Romeo Spider New

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2007 Alfa Romeo Spider


Alfa Romeo Spider New

The new Alfa Romeo Spider is a "legend" open sports cars, the last heir of these heroes who became classics road of peace, and Giulietta Spider Duetto. During his debut at the Geneva Car this model as soon received the prestigious prize "convertible year 2006".

2007 Alfa Romeo Spider


Alfa Romeo Spider New

The Alfa Romeo Spider is a worthy representative of a new generation of awards Alfa Romeo. The Italian in the details, it is the result of joint work of the Alfa Romeo Spider with the two designers whose names serve as a symbol of Italian style in the world: Dzhudzharo and Pininfarina.

2007 Alfa Romeo Spider

2010 Nissan 370Z Roadster

The Nissan 370Z Roadster is the convertible version of the 370Z. It will be available in late summer 2009.

2010 Nissan 370Z Roadster


Nissan 370Z Roadster

Be an alternative to models like the BMW Z4, Mercedes-Benz SLK, Porsche Boxster S or Audi S5 Cabrio. The Nissan 370Z Roadster, as the Porsche and Audi, has a roof which is made of a canvas; the Mercedes-Benz and BMW Z4 carry a folding metal.

Nissan 370Z Roadster

The roof of the Nissan 370Z Roadster has been designed according to Nissan, to meet three objectives: the Nissan 370Z Roadster is recognizable as a Nissan 'Z' by its silhouette, and is convertible tops or the operation of opening and closing the roof is rapid and piece of cake.

Nissan 370Z Roadster

The moon roof is glass and carries electrical resistors to prevent fogging. The Nissan 370Z Roadster has not specified how much it takes to open or close. The model it replaces, the 350Z Roadster, it took 20 s.

Nissan 370Z Roadster

The hood is connected to the frame of the windshield with three fixing points, the central beam to be a release or block manually (Nissan has not explained how they carried out this operation on the Nissan 370Z Roadster).

Nissan 370Z Roadster

Behind the seats has a crystal deflector for limiting air turbulence reaching the occupants when driving with the roof folded.


Nissan 370Z Roadster

The Nissan 370Z Roadster has a 3.7 liter V6 engine that provides 330 hp. It is more powerful and has more displacement than the Nissan 370Z Roadster; a 3.5-liter V6 in the latest version had 313 hp. It can be coupled to a gearbox six-speed manual or an automatic seven relations, which can be operated from the lever or by a cam located behind the wheel.

Nissan 370Z Roadster

The manual transmission has a system called 'SynchroRev Control" which allows the gears quickly and easily fall over the cuts.