AmplifierCircuits

FEATURES • Two independent amplifiers with open-loop gain of  90 dB (typical) • Internal DC feedback via 140 kΩ resistor from output to  feedback point • AC characteristics that can be determined externally by  an RC network • Electronic on/off switching with transient suppression for  switch on • Head input at DC ground that eliminates the input  coupling capacitor • Minimum external component requirement • Stability down to a gain of 30 dB • Low input noise • Low distortion • DC input current <2 µA. GENERAL DESCRIPTION The TDA1523 is a playback amplifier for car radio/cassette  players. Circuit diagram: Preamplifier and Equalizer TDA1523 Datasheet for TDA1523:   Download

Dual Low Noise Preamplifier

Low Noise Stereo Preamplifier

Acoustic spectrum is extended by the 20Hz frequency is very low and reaches as high frequency 20000Hz. In the low frequency is lowered sense of direction. This reasoning leads us to attribute to the speaker's use of very low frequency. Making it to you we propose to distinguish these frequencies, in order for him to lead us on a suitable amplifier. Acoustic filter are met at different points in the sound system. Applications knownest they are filter baxandal to organize low-and high-frequency tones and crossover filter where the acoustics are separated in the subareas, for it leads to the appropriate speakers. Applications that you can we propose is a simple filter that limits the acoustic region (20-20000Hz) in 20-100Hz region. With manufacturing, we propose that you can you can make an active filter for you lead a very low frequency loudspeaker. With this you will put a big one between speaker HIFI speakers from you. In order for you to have a complete picture of sound you ...

This is a good pre-amplifier for microphones that can be. Used in, for example, mixing consoles The circuit operates with a dual op-amp type NE 5532. The amplifier must be adjusted. Simply plug the power and control over P1 such that half the supply voltage (6 V) on pin 3 of IC1 state. P2 is then adjusted to the desired volume. R1 = 8,2 kW R2, R4, R5, R6 = 10 kW R3 = 1 k P1 = 4.7 K? P2 = 100 k C1, C2, C4, C6 = 10 uF C3 = 470 nF C5 = 100 nF IC1 NE = 5532