Audio Preamplifier, filter, crossover circuits - Service Manuals

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Audio Line High-End Preamplifier with ICs

Audio Peak Indicator (overload)

Audio Preamplifier with Digital Volume

Auto Fade for Audio signals

Class A Buffer preamplifier module

Class A preamplifier module with IC

Electronic Balance Input to Electronic Balance output

Electronic Balance input with Gain and Volume

High-End Audio Modular Preamplifier

Module 1 Line amplifier in Class A

Module 2 Line amplifier in Class A

Remove common signal from Stereo sound

Speech filter- Band pass (300HZ to 3KHZ)

Stereo Preamplifier with elect. adjustment Volume-Balance-Treble-Bass

Symmetrical Audio Class A preamplifier 3

Symmetrical class A Line amplifier 1

Symmetrical class A Line amplifier 2

Variable High-Pass 20HZ to 200HZ Filter
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