Simplex Osc-Mike Interface Board for the 2001-9010 Panel

S Simplex INTRODUCTION Osc Mike OS Mike 2001 9010 WD No 841 578 the mike button is pressed and Pl 3 and is fed to the mike interface preamplifier via pins P2 1 and P2 2 by way of the Kl A contacts fed to pin Pl 4 stop the oscillator The mike signal is applied to pins fed to the amplification The amplified signal Operation Condition the operating voltage on pin P2 4 equals the trouble bus battery voltage to pin P3 4 pin P3 3 will send out V