SS-100 UNIVERSAL "SOFT START" INSTALLATION INSTRUCTIONS PART S SUPPLIED WITH T HIS KIT : (1) SS-100 "S oft Start" Circuit Board Assembly It is not possible to give exact installation instruc tions for the Universal "Soft Start" module because I ha ve neither the schematic nor the physical layout of your specific am plifier. I can give you enough information, together with the schematic of the Universal "Soft Start", to help you install this module. Plea se exam ine the SS-100 m od ul e. N ote that there are letters on the foil side that designate the leads to be connected. The "C" and "D" leads will be connected to the switche d power input. The "A" and "B" leads will be connected to the load. A RED wire betwe en p ads "C" and "D" (user supplied) is connected to the neutral or return of the input power line. Refer to the schematic below. The m odule will be mounted using silicone a dhe sive relay side to the ch assis. The overall o peration is qu ite sim ple. W hen the power switch in turn ed ON , 240 volts is ap plied to the load through a 20 10W resistor in each side of the line. The voltage at the load is measured by the diode connected to pad "A". As the filter capacitors and other components charge or stabilize in current drain, the voltage at pad "A" rises. When this voltage reaches app roximately 90 volts, the two relays are activated, shorting out the 20 resistors. Now the power c ircuit is back to its full power state and the soft start circuit is locked out of operation. 120-VOLT OPERATION If this circuit is to be installed in equipm ent operating from 120-volt AC power lines, a mo dification m ust be made. The 20 10W resistors must be changed to 10 10W . These resistors are readily available at any electronic store. However, if the soft start is used with equipm ent running on less than 120 volts, the resistors probably do not need to be changed. NOTE: If only one side of the input power line is switched, be sure that the switched lead is on the "C to A" side of the soft start circuit. PARTS LIST D1 K1 & K2 R1 & R2 (240VAC) R1 & R2 (120 VAC) R3 C1 & C2 1N4005 (1A 600 PIV) SPDT 12A 48VDC 20 10W 10 10W 2400 2W 5% 100µF 63VDC HARBACH ELECTRONICS Jeff Weinberg ­ W8CQ 468 County Road 620 Polk, OH 44866-9711 (419) 945-2359 http://www.harbachelectronics.com info@harbachelectronics.com 1 ...