ECN PH3-0002    September 12, 2002

SD-2 Dual Audio Silence Sensor

The silence delay can be increase to 1 - 10 minutes by changing the following components.

C13 and C15 from 220uF/35V TO 2200uF/25V - The two capacitors are next to the mute alarm push button switch.
R43 and R48 from 5,100 (5K1) Ohms TO 27,000 (27K) Ohms - The resistors are located behind the delay potentiometer for each channel.

Note: By using either 1100uf OR 13K5 the 1 - 10 minutes would change to 0.5 - 5 minutes. Various combinations will produce different delay ranges.