"To ensure an adequate reserve of power
I chose two 650 VA toroidal transformers, each rectified
by 35A high surge current bridge rectifier. The PSU60 kit
from Ampslab provides the fuses and connections for the
power rails and 60 000uF of capacitance. I added two additional
22 000uF high current capacitors due to the large number
of amplifier modules. With all this capacitance I installed
the Soft start turn on delay kit from Ampslab so the amp
does not trip any circuit breakers or fuses. This delay
also helps stop the house lights dimming and "thump"
noise in speakers at amplifier turn on. The soft start turn
on delay is powered via a small12V toroidal transformer
mounted to the base panel.
next thing I did was power up the amplifier to test it.
I was nervous at first but after I applied power and no
smoke/fire/sparks were seen I was happy!! I applied bias
to all seven modules per the Ampslab instruction, the bias
level is really
to set accurately so I was very happy at this point.
all the time and effort I put
into building this amplifier I could not wait to listen
to it so I connected it to a CD/DVD player to listen
straight away. After checking each channel operated correctly
by ear and then with a CRO I was very pleased with the results,
the sound is very clean and clear with no hiss or hum and
plenty of power in reserve.