Concept
The circuit follows the recommendations of the manufacturers of LM317/LM337 chips for a power supply with reduced noise level. Due to the low power consumption of the analogue part (some mA's) we don't bother about the power losses of these relatively old chips.
The board has +/-15V dc-outputs for the headphone-amp which has separate stabilization devices. The ground output is thought to connect the metal case.
I had the intention to use a toroidal transformer for which I designed an inrush current limiter board. I noted later: in my housing was too little space, so I took a EL54 transformer (Block, 2x15V, 13VA) instead and removed the inrush current limiter part again.
Hardware
The whole KiCad-project (including Gerber-files) can be found here. Remark: it was made under Linux with KiCad-version 4.0.7 using this additional libaries. The bill of material (bom) as semicolon separated text file contains some comments about part dimensioning / quality.
The board for the mains side of the transformer can be found here.
The bill of material (bom) for the mains side pcb as semicolon separated text file contains some comments about part dimensioning / quality.
License
Please keep in mind: all content on this page is licensed under the terms of the GPLv3.
falk.richter*at*yandex.com
Last update: December 20, 2019