Power selection guide

Power selection guide.This table should be used as a power configuration guide. Powers shown are approximate and probably maximum depending on the size and quality of the power supply. Power have been estimated to real world applications using a reasonable power supply.Definition of Reasonable:Transfomer VA = total output power x 1.5. DC smoothing section = 80uF capacitance per DC rail per watt of output power.Example: A stereo amplifier running 60 volt rails capable of 165 watts into 8 ohms per channel will require a 500va transformer and a capacitor bank of 13,200uF per rail or 26,400uF per amp module or 52,800uF for a stereo set-up.AC volts(Vac 0 Vac)DC rail volts (+/-)Value R6 (Kohm)Value R17 (Kohm)Pwr8 ohmsFETsreq.Fuses (A) Pwr4 ohms FETsreq.Fuses (A) Pwr2 ohms FETsreq.Fuses (A)

30402.7226422.011523.021046.0

33456.8228222.014644.026567.0

37506.82710722.519244.534668.0

40556.82712822.523045.041589.0

4460122716023.029046.0515810

4765123318543.533566.06101011

5170183322343.540567.0NONONO

5475183325344.046087.0NONONO

5880183329744.054087.5NONONO

6185183933064.5600108.0NONONO

Notes:The guide is configured for power mosfets similar to International Rectifier IRFP450, and is generally applicable for FETs with a Pd of 180 to 200 watts (Tc = 25 degC). The number of FETs shown is per module.R6 determines the voltage remaining across T4 the constant current source for the first stage. R17 sets the gain of the amplifier.Fuses are fast blow types.