I think it is slowly making sense. I am kinda slow after all.
So if I wanted the Parts Express TAS5630 2 x 300W of Class-D power
Great for use as a subwoofer amp and with tactile transducers
Over-engineered protection circuits
Robust heatsink with two-stage fan
Requires 20 to 50 VDC power supply
This is how things come together.
House current 120AC comes into a toroidal transformer and the AC current is either raised or lowered by the transformer. It does not change it from AC to DC it simply changes the voltage. So for the above Parts Express amplifier I need a voltage of 20-50VDC.
A simple Power Supply converts one form of power to another form of power. In my case I want to go from AC to DC. The power Supply will also increase input power from the toroidal transformer by 1.4.
To get the right volts DC, I take 50/1.4=35.7
I also take 20/1.4=14.3
So I need a toroidal transformer that will take my 120v AC house current and step it down to somewhere between 35.7 AC to 14.3 AC.
The Power Supply will then take the stepped down current from the toroidal transform, convert the AC current to DC current and raise it by a factor of 1.4.
So I would like to keep my DC current high for the amplifier to make sure it does not run out of OOmph so I would be looking at a toroidal that changes the 120 AC to around 35 AC.
I think the Antec 4434 400VA Audio Toroidal Transformers would be a good match providing:
Outputs 4x
Power 400VA
Output Voltage Current
34V 5.9A
34V 5.9A
15V 2A
15V 2A
Antek - AS-4434
...
I like that these transformers have 4 outlets so I could add another power supply and amplifier on each output or more down the road. This would mean on the ext board I could save a little mula.
From the Antec 6435, a 35 V AC current would go to the Power Supply and be increased by 1.41 and converted to DC current and come out of the PS as 49.35 V DC.
The power supply I would select for this little exercise is the ClassDAudio Power Supply.
From there website,
"This DC Power supply operates up to +/- 75 volts. Huge filter capacitance of 28,200 (14,100 microfarad per side) significantly reduces ripple. Two blue LED power indicators. This power supply is suitable for all of our amplifiers. Comes with 3 watt bleeder resistors, 8 Amp 800V rectifier, large 100V 105 degree capacitors, so with larger bleeder capacitors can handle up to 85 volts. Size: 4.5" D X 4.25" W X 2.25" Tall. You will need a transformer with either center tap or dual seconderies. You can calculate the voltage the power supply will put out by multiplying the transformer secondaries by 1.41... example: if your transformer has 30 volt secondaries, multiply 30 X 1.41 = 42.3 volts. "
This power supply goes up to 75 volts so the 35 volt Antec should not be a problem.
I think I understand what I am doing and why. I still have a question on amperage. How important is it? I do not see the class-d amplifier boards specifying what amperage they operate at. I would hate to burn up the amplifier board from having too much or too little amperage.
I guess the study continues for a bit longer.