Arny Krueger wrote:

"Anton Gÿsen" wrote
Anton Gÿsen wrote:

The power input on the DAC requires 1.5 amps AC.

Forgot to mention, it's 12 volts.

Designing power supplies is a cookbook process.

The transformer you linked to is vast overkill, but also inadequate. You
don't need a 6 amp transformer for a DAC. Even 1.0 amp might be overkill.

If you want to build a power supply that puts out 12 volts, you will
probably need a power transformer that puts out more than 12 volts. The
extra voltage will be taken up by losses, particularly in the regulator.

Also, you want some allowance for situations where the power line's voltage
is lower than spec.

It is common to build regulated power supplies for 120 volts that work well
when the power line is 90 or 100 volts. For example a power transformer for
a power supply that puts out 12 volts might be based on a 16 or 18 volt
transformer. The voltage regulator will take up the slack most of the
time.

He's in the UK though.

It's mostly 240-252V here. Despite the EU. The Chinese don't understand this and
design for 230V, so if anything he should be getting more volts out than he
needs (i.e more 'headroom'), plus the core will be closer to saturation, so it
will get warm.

Graham