Universal Audio 1176LN User's Guide download pdf (Page 11)

Theory of Operation

Input

Circuit

Pre-Amp Output Amp

GR Control

Circuit

Signal

Out

Figure 1 - Block Diagram of the 1176LN.

Overview

Figure 1 shows the block diagram of the 1176LN Limiting Amplifier. Signal limiting and

compression is performed by the Gain Reduction section. Before the signal is applied to

the Gain Reduction section, the audio signal is attenuated by the Input stage. The amount

of attenuation is controlled by the input control potentiometer. The amount of gain

reduction as well as the compressor Attack and Release times are controlled by Gain

Reduction Control circuit. After Gain Reduction a pre-amp is use to increase the signal

level. The Output Control potentiometer is then used to control the amount of drive that is

applied to the output amplifier. The 1176LN is a feedback style compressor since the

signal level is sensed after the gain reduction is applied to the signal.

600

R1A

600

R1B

+/-

GND

To GR ck

620 1/4w

R74

270

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Universal Audio 1176LN User's Guide Page 11