А что такое палмер3?
В Alto стоят довольно хорошие ОУ 4580M:
The AZ4580 is a monolithic dual low noise operational
amplifier. It is specifically designed for audio systems
to improve tone control; it can also be used in preamplifier,
industrial measurement tools and applications
where gain and phase matched channels are mandatory.
The IC features internal frequency compensation, low
noise, low distortion, high gain and high bandwidth.
The AZ4580 can operate under dual power supply
voltage up to ±18V or single power supply up to 36V.
The AZ4580 is available in DIP-8, SOIC-8, SIP-8 and
TSSOP-8 packages.
Features
· Large Signal Voltage Gain: 110dB Typical
· Low Input Noise Voltage: 0.7 μVRMS (RIAA)
Typical
· Wide Gain Bandwidth Product: 15 MHz at
10KHz Typical
· Low Distortion: 0.0005% Typical
· Slew Rate: 7V/μs Typical
Applications
· Audio AC-3 Decoder System
· Audio Amplifier
SOIC-8 DIP-8
Figure 1. Package Types of AZ4580
SIP-8
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