Thursday, May 17, 2012
Built this amp 20 years ago for my little Ford Tempo . It got a switching power supply that can handle up to 250 A input current if needed . Main control IC is SG 3524 switching regulator that is set to keep voltage at + and -45 V even if car battery goes down to 11V . There are 5 mosfets per side each rated 50 Amps ( 250 A ). Primary of ferrite transformer ( 2 toroids together ) got 5 heavy wire coils , 10 turns each with center tap that's connected to + 12 V. Secondary coil is connected to 16 A fast rectifier , choke and finally 15000 uF caps that feed the amplifiers . There are two power amplifiers ( analog not class D , didn't know much about class D at the time ) , small signal transistors were rated 140 volts , output transistors ( TIP 35 C / TIP 36 C ) are 100 V . I had to connect them in parallel to handle all the output current . I also built a circuit to feed both amps , one amp gets a strait input while other one gets it inverted ... thats how bridged amps work . ps. Check schematic for this in my other video : Schematic for Home Made Car Stereo
http://www.youtube.com/watch?v=l3qLoHJ7Pzo&hl=en
