Audio Frequency Circuit

13 Kasım 2010 Cumartesi

Audio preamplifier with tone controls

The margin of sensitivity and an overload of audio preamplifier circuits are designed to cope with more modern music program sources such as CD players, tape recorders, iPod, computer output audio, tuner etc... Source select switch and input connectors do not appear, and their number and their arrangement are left to the manufacturer.

A margin overload audio preamplifier for pre amplifier volume control extremely high input was provided input.After a gain level converter impedance (T1) negative feedback type low Baxandall and treble EQ step was ajoutée.Comme some very low noise (5.6 times) win this phase must provide, phase characteristics implementiert.Diese two transistors with FET input circuits was also excellent THD numbers "their" 4V RMS output and an exit low impedance, needed to drive right Mini MosFet power amplifier, but can be used for other purposes.

Audio preamplifier The parts list:

R1 = 220 K 1/4W resistance
R2 = 100 K 1/4W resistance
R3 = 2 K 7 1/4W resistance
R4, R5 = 8 K 2 resistors 1/4W
R6 4 K = 7 1/4W resistance
R7, R8, R13 = 2 K 2 resistors 1/4W
R9 = 2 M 2 1/4W resistance
R10, R11 = 47 K 1/4W resistance
R12 33 K = 1/4W resistance
R14 = 470R 1/4W resistance
R15 10 K = 1/4W resistance
R16 3 K = 3 1/4W resistance (see notes)

= C1, C2, C9 470nF lo polyester capacitors
C3, C4 = 47nF lo polyester capacitors
C5, C6 = 6n8 lo polyester capacitors
C7 = 10µF lo electrolytic capacitors
C8, C10 = 22µF 25V electrolytic capacitors
C11 = 470µF 25V electrolytic capacitors (see notes)

Q1, Q3 BC550C input voltages 100mA low noise = gain high NPN transistor
Q2 = multifunctional N-channel FET 2N3819

MP3 car amplifiers

Here, a diagram is an active speakers. LF353 goes Audio parts in three bands. SANYO LA47536 goes to amplify these signals. In stereo mode, we have eight high speakers that will create a very large acoustic pressure action.

Three bands active tone
These devices are low-cost, high speed, dual JFET input operational amplifier with a carved .you in-house offset (BI - FET II technology) requiring a low current supply still retained a bandwidth product input voltage benefit and high slew rate. Also the input voltage of well co-ordinated high JFET devices very low input bias and compensating currents.

LF353 pin compatible with the standard that LM1558 enables designers, e the ability of the existing models LM1558 and LM358 immediately to aktualisieren.Diese amplifier can be used in applications such as the inclusive high-speed fast D converters, sampling and organize tours and many other circuits require low offset voltage, low bias current input, high input impedance, high scanning speed and range.Devices also have low noise and offset voltage drift.

Power amplifier

If the amplifier behind installed in carry-on baggage is, we need a switch works Stop.Die LA47536 pin4.Diese pine stand a higher a function require a small voltage of 21 to launch amplifier .TRANSISTOR T1 and T2 causes if walking distance driver left number is enabled, the fire back light or press brake lamps Kindle reader back Q2, it has same drive Q1, which applies a > 21 voltage it overview pin4.

LA47536 four channel 45 W BTL car audio amplifiers
The LA47536 emerged Channel 4 BTL power amplifier IC designed for car audio characteristics Systeme.Die stage

-A structure free pure transistors on the top side V PNP and NPN transistors side low, used to provide high performance and excellent audio quality.

-LA47536 includes almost all features for audio use car including Eve, switch also self-diagnostics (output offset detection) function a muting function and protection circuit.

Printed circuit boards

Article source: visit 150W MP3 car amplifiers

21 Ekim 2010 Perşembe

Otomobile Amplifier for MP3

A mp3 player can use a car amplifier. LF 353 is changing audio signal to 3 bands.

Three Band Active Tone Control Circuit

Low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage They require low supply current yet maintain a large gain band width product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents.

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11 Ekim 2010 Pazartesi