TommyBoy wrote:what is your LOADED voltage at v-min measured with a scope ?
to be able to generate 5.00 stable, with no ripple the min pulse must be over 6V
so your trafo deliver too Low voltage,
use a 9V AC trafo and shotkey diodes will give correct range, then add a pre-regulator adjusted to 6V
this way your transfer a perfect DC supply into your critical unit, and this way it can make perfect 5V and all the other voltages,
I connected a 15 Ohm 5 W resistor at the output. Without this load, i got about 8.7 VDC. That complies with 6 x √ 2. With the 15 Ohm load it's about 7.4 VDC. No ripple. I guess that's good enough for the LT1963's.
I use four of them. 5V for the DAC, 5V, 3V3 and 1V8 for the Pi. Each LT1963 will be supplied with the raw voltage coming from the rectifier. I'll have to dive in the circuitry of the DAC to bypass the onboard 3V3 stabilizer too, and adjust the 5V for the DAC at 3V3.