The following diagram is an small surround sound decoder schematics. You may use this decoder surround sound systems for your home audio system. Parts List: R1-2-7-8-12-13-18-19-20=47Kohm R3-4-5-6-21-22-34-35=10Kohm R9-10-11-14-15-16-17=15Kohm R=23-24-25-33-36=100ohm R26-27-28-31-32=100Kohm R29-30=5.6Kohm C1-8=47uF 25V C2-7-9-14-23=47nF 100V C3-6=1uF 100V C4-5-10=33pF 100V C11-12-15=10uF 25V C13=82nF C16=18pF 100V C17=100pF mini adjustable capacitor C18=2.2nF C19=4.7uF 25V C20=100nF 100V C21=10nF C22=180pF C24=150nF RV1-RV2=2X10Kohm Log. pot. RV3-4=10K Log pot. D1=1N4148 IC1-6=TL072 IC2-3=TL074 IC4=MN3101 IC5=MN3004 JI…..J6=RCA female jack
This is the diagram of passive surround circuit. Passive surround doesn’t required any active components to make the circuit works. The circuit just need the combination of resistors and electrolytic capacitors. Notes: Use full range type of speaker. Do not use woofer or tweeter speakers for rear speakers. 5W resistors is a must, 1/4 or 1/2 watt resistor will make it burned.
Building a crossover for your speaker system is easy. Here the schematic diagram: Notes: Capacitor must be non-polar capacitor types with a voltage rating of 50 volt or more (preferably 100 volt). Capacitor may be paralled to achieve specified values. Inductors should be air core. Do not mount inductors in top of each other. Resistors should be 100 Watts or more.