Sjöström Audio DIY forum

Per Anders, here is what was at play. The DAC board was actually drawing more than 100mA. The choke was designed for this rating, which wasn't enough. Hence the choke saturated and behaved as a resistance. Installing a choke with higher current capacity has solved the issue. Thanks again for your support and for the regulator.

What is the values of the output voltages?

The two in the middle. The leds stop shining after about five seconds.

Great, thanks P-A. I found a rubber cap for a rocker switch which fit perfectly ontop of the LED. Otherwise the assembled SSR01 works excellently it seems - 6.97V output spot on with the calculations.

This is a good point. I will try and let you know. In the meantime, thanks for your support.

If you use a super regulator with 120 dB in PSSR you don't need any inductor.

In my (limited, certainly) experience, choke rectification works well with a good amount of inductance (within current limits of the choke of course) and can handle lower values of capacitance. I've used this topology in a good number of projects (although never before in a 12V power supply). Let me try to increase capacitance and see how it goes.

Why do you have a huge inductor and a very minimal capacitance after the rectifier bridge?

That's strange indeed. Here are the DC voltage measurements.

Rectified B+ (before even connecting the SSR01): 30VDC
Input voltage on the SSR01 when connected to B+ but with no load on the output: 18.3V
Input voltage on the SSR01 when connected to B+ with a 100R load: 7.3V

The input voltage is? Something isn't right here.

Output = 5.2
Q2 = 0.9
IC = 1.67

= 7.77 V is that what you have as input voltage? In order to work properly you must have 18V in min.