Tag Archives: Satellite
A major problem of designers of audio system requirements faced uneven output power from satellite speakers and a subwoofer is. Typically, the subwoofer output requires four to five times for the right balance. With only 5V is available, a variety of audio power amplifier solutions were used, each with its own drawbacks.
The most common solution was to use two stereo amps of output power. A hard disk drives and the other satellite amplifier to the subwoofer. The satellites use 8? speakers, while the subwoofer is used 4? speakers. The result is a solution of 2.1 with 2 x 1W satellites and a subwoofer 1 x 2W. This solution is simple, it does not provide enough power for the subwoofer to produce a significant amount of bass. In addition, the use of 8? speakers for the satellites do not maximize the amount of satellite sound pressure level (SPL). Therefore, the overall volume of this approach is limited.
The main problem with the design of the subwoofer woofer stereo amplifier with a total production, is that the signals from the left and right channels, sooner or later, are summarized. As a result of the addition only is the separation between channels is minimized and violates the idea of ??stereo systems satellite. The most effective method of summation today – active signal smesitelyami – filters with high input impedance, which is often used by field-effect transistors. To improve subsequent increase in the amplitude of the signal cascade.
I tried to do a different route – the most to weaken the signals from and to their addition, as late as possible before the signal with high sensitivity TDA 7240 – 46dB chip-amp. The second chip TDA 1517, serves as a medium-frequency driver.
The TV video transmitter work is a television station to transfer video from various video sources like video cameras, satellite receivers, DVD players, game consoles, etc. circuit television transmitter on the basis of 470 to 580 MHz and can be received on UHF channels 21-34.
TV video transmitter emits up to 300 meters with a 10-20 cm antenna wire. TV stations need to power 9-15 volts. You can also work with a 9V battery. Oscillator is based around RF transistors BF199 and BFR90. If necessary in the field of television stations with 2N3886 transistors can be expanded by replacing BFR90.
This audio project note provides an overview of conventional constructions 2.1 audio for laptops, and examines how they meet the requirements uneven output power satellite speakers and subwoofer to meet. The article then details Maxim highly effective and cost 2.1 speaker system solution, which provides 2 x 1 x 2 W and 7W of output power.
Audio Designer for laptops are constantly working to improve their system. Designs in a small room, is one of the best solutions to a configuration 2.1, the satellite stereo applications for medium and high frequencies (typically 500 Hz and above in the portable computer systems) and a single subwoofer for low frequencies (typically 500 Hz or less in a laptop computer systems).