Power transformer
VA
wattage and Heatsink C/W calculator for AC/DC and PowerStation power supply kits
Highest AC
IN
to 0v voltage
Vac
Voltage +V1 is set to
Vdc
Voltage -V1 is set to
Vdc
Unreg volts
to +/-V1 & V2
Vdc
Current draw of +V1
Amps
Current draw of -V1
Amps
Doubler (2) Tripler (3)
times
Wattage used by +V1
W
Wattage used by -V1
W
Unreg voltage to 48v reg
Vdc
Wattage wasted in reg by +V1
W
Wattage wasted in reg by -V1
W
Voltage +48v is set to
Vdc
Total +V1 Wattage
W
Total -V1 Wattage
W
Current draw of +
48v
Amps
Heatsink C/W Rating for +V1
C/W
Heatsink C/W Rating for -V1
C/W
Wattage used by +
48v
W
Wattage wasted in reg by +
48v
W
Voltage +V2 is set to
Vdc
Voltage -V2 is set to
Vdc
Total +
48v
Wattage
W
Current draw of +V2
Amps
Current draw of -V2
Amps
Heatsink C/W Rating
for +48v
C/W
Wattage used by +V2
W
Wattage used by -V2
W
Wattage wasted in reg by +V2
W
Wattage wasted in reg by -V2
W
Total Transformer Wattage
VA
Total +V2 Wattage
W
Total -V2 Wattage
W
Total Heatsink C/W Rating
C/W
Heatsink C/W Rating for +V2
C/W
Heatsink C/W Rating for -V2
C/W
Note 1. Power transformer secondary voltages are likely to be 10 to 20% higher than the stated value with no load on the power supply so is best to add this amount.
Note 2. Unreg volts to +/-V1 & +/-V2 & +48v needs to be at least 6v higher than the reg dc voltage you need.
Note 3. All 1000uF cap voltage rating needs to be equal to or higher than Unreg volts to +/-V1 & +/-V2.
Note 4. Heatsinks needs to have a C/W rating lower then on the above table. The lower the C/W rating the better. If C/W rating is higher than 50 then no heatsink is required.
Note 5. When doing AC/DC calculations make sure +V2 and -V2 have 0 current values.
Note 6. If you have disabled the Doubler/Tripler to use the 48v as another +V rail just enter 1 into the Doubler/Tripler box.