Assembled the board.. having checked all the parts beforehand.. put 15 ohms in place of 75 ohms... turned it on... 22.4 volts at the output of the filter capacitors, 22.4 volts at the board output, not adjustable. Output LEDs light up, diodes near the filter capacitors do not light up, the BD140 transistor heats up, checked all the parts for correct soldering, everything seems to be correct.. where could I have made a mistake
Hay anyone simulated the Studer900 original/clone on LTspice?
Hos does it compare with those 317/337 regulated kits sold by Aliexpress in measurements and audio quality?
Hos does it compare with those 317/337 regulated kits sold by Aliexpress in measurements and audio quality?
Gabster tested 10 PS recently and found the Studer 900 clones to give lowest noise levels after the legendary (and much more $) IanCanada UCPure MK III and Linear Pi. Noise ~0.8uV. See
and
. No need to approximate with LTspice.
There are cheaper and equally well measuring PSUs around. DIY or semi DIY. But is the absolute very best and lowest noise PSU necessary when feeding a RF generating load like a RPi?
Excellent DC power is always good for audiophile goals. Digital electronics are susceptible to ground plane noise, RFI and EMI. RPi is no exception. RPi like any PC or processor-based circuits, also generates processor noise, which audiophiles spend pains to mitigate. Common knowledge is that jitter even in picoseconds are discernable as hash or other undesirable dissonance. Such is the plight of the audiophile 🙂
I did see the YouTube testing video. But he didn't test any chip regulator power supply like those sold by Aliexpress. That would add more modern solutions to the regulation question.
I would also like to see an LTspice simulation of the Studer.
I would also like to see an LTspice simulation of the Studer.
Hello, That resistor is acually 7.5 ohms. I was wondering why it has been changed from 15ohms.