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A simple
stereo audio amplifier is built around two 7905 negative-voltage
regulators (IC1 and IC2) and a few discrete components. The circuit
will also work with other 79XX regulators if appropriate power supply
is used. Regulator IC 7905 works as an amplifier for the voltages
applied to common pin2 (Ground or GND). Also check the LM317 audio
amplifier, another interesting circuit.The minimal voltage drop over the
standard 7905 is around 2V and it depends on the output current.
Feedback resistors in the IC set the gain of the channel internally.
The amplifier is a class-A audio amplifier. The minimal applicable
value of R3 for the regulator 7905 is 8.2 to 10 ohms per 5W.

7905 1 Watt Audio Amplifier Schematic

If
the required output current for LS1 is below 100 mA, the value of
resistor R3 can be 33 to 51 ohms per watt. The circuit works with any
load resistance (R3 in parallel with LS1 as the load) under the
condition that the regulator is not overloaded with current and power
dissipation. However, it is preferable to use a loudspeaker with a high
resistance (8 ohms, 16 ohms or more). The amplifier works well with
low-impedance headphones having a resistance of 24 to 32 ohms. The
voltage difference between the ground pin of 7905 and the output pin is
fixed internally.
S2 is the on/off switch. Switch S1 is for
mono/stereo selection. When switch S1 is closed, the amplifier works as
a two-way mono amplifier. If S1 is open, the amplifier works as a
stereo amplifier. If no input signal is applied, the DC voltage on the
output of the regulator 7905 should be around –5V, which depends to
some extent on the value of VR1. The maximum output current of 7905 can
be up to 1A and the maximum power dissipation is up to 15W. Mount the
regulator IC 7905 on a heat-sink with

We all know that brand names matter when purchasing car audio hardware. There are brands that are surely more reputable than others. When you are at the store and they offer choice after choice after choice, suddenly you feel overwhelmed on what really to buy. But you can be assured of one thing, if they offer you an Alpine car stereo you can’t go wrong with it.

Alpine car stereo and electronics, founded in 1978, is a world leader in the industry of high performance mobile electronics. They specialize in mobile multimedia, an integrated system approach incorporating digital entertainment, security and navigation products for the mobile entertainment.

Alpine car stereos are a new breed of units which feature the convergence of high performance audio, video, navigation and telematics in the form of Mobile Multimedia. Navigation systems act as the resource center of the Alpine car stereo Mobile Multimedia lineup. Intelligent Transportation Systems (ITS), DVD players, Dolby Digital systems, satellite digital audio radio, mobile data linking and communication through telematics devices will be fused with navigation systems to create a platform of products. Mobile Multimedia integrates Alpines innovative audio, video, security and navigation products, as well as its new GUI for Drivers, human interface and information communications technology.

To grasp what the Alpine car stereo Mobile Multimedia is, take a look at the IVA-D901 Alpine car stereo Mobile Multimedia Station/CD/DVD Receiver/Ai-NET Controller.

The IVA-D901 has 400% more pixels than a conventional in-vehicle display, meaning that it has 1.15 million pixel elements. It has 50W x 4 built-in power and 3 PreOuts (4 volt), SAT Radio ready, a Hard Disc Drive (HDD), and Alpine car stereo Navigation. Key features include:

- 7" Fully Motorized Wide Screen Monitor

- 18W x 4 MOSFET Amplifier

- Built-in Dolby Digital/DTS Decoder

- Bass Engine® Plus

- Subwoofer Level Control

- Bass Center Frequency Control

- Bass Band Width Adjustment

- Treble Center Frequency Control

- Subwoofer Phase Selector

- Bass Type Control

- 4-Ch Digital Time Correction

- 3 Position 12 dB/Oct Crossover

- MediaXpander™

- SAT Radio Ready

- MP3 Text Information Display

- Quick Search Function

- CD/CD-R Playback

- CD Text, Text Display, Text Scroll

- M DAC

- MaxTune SQ Tuner

- 3 Auxilliary A/V Inputs with Remote Control Input

- Dedicated Navigation Input

- Dedicated Camera Input

- 2 Auxilliary Monitor A/V Outputs

- Navigation Audio Mix

- 3 PreOuts (4 volt)

- MM Driver (Hard Disc Drive) Ready

- MobileHub Ready

- Ai-NET Control Center DVD/CD/MP3 Changer Controller

- "Digital Art" Spectrum Analyzer Display

- RUE-4190 Universal Wireless Remote Control Included

If these all seems too much for you, Alpine car stereos also have more conventional head units to offer. The CDA-9835 Alpine car stereo In-Dash CD Player/Ai-Changer Controller lets you fully customize both illumination and sound, with a range of 512 colors and super-versatile Bass Engine functions like digital time correction and parametric EQ. You can download audio parameter settings and connect and control as many as eight amps. The BioLite display, Menu key and rotary knob make operation extremely easy.

Like most Alpine car stereo units, it is also SAT Radio Ready, giving you a much greater choice of listening options than ordinary local AM/FM radio. You can select from among a wide range of music genres, news, sports, and talk programs with digital quality anywhere.