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

Applications: Portable component stereos, tape-recorders, radio-cassette recorders, car stereos. Features: On-chip one operational amplifier. 5-band graphic equalizer for one channel can be formed easily by externally connecting capacitors and variable resistors which fix fo (resonance frequency). Series connection of two LA3600’s makes multiband (6 to 10 bands) available. Highly stable to capacitive load. LA3600 Circuit diagram: LA3600 Circuit diagram   LA3600 pcb: LA3600 pcb