The above is the schematic design for the DRD45 power supply. This was done using PSU Designer II. The above shows a residual 'noise' of around 6 mV, which with a 510 V gives a noise dB of around -98dB. This of course ignores the higher harmonics generated, but makes a good starting point. The design calls for a 50uF ASC oil cap, followed by Electra-Print's 20H choke, and then a dual combo of 100uF Solen aluminium can and a 47uF Solen PPE capacitor. There is scope to change the last 47uF to a 50uF ASC Oil. Wanted to avoid electrolytics not just for the rumoured acoustic difference, but also for reliability. The power supply transformer is 410-0-410V, which is an odd rating, but I am sure that Jack (Electra-Print) is able to wind one that is suitable.
Tuesday 30 October 2007
PSU for the DRD45
The above is the schematic design for the DRD45 power supply. This was done using PSU Designer II. The above shows a residual 'noise' of around 6 mV, which with a 510 V gives a noise dB of around -98dB. This of course ignores the higher harmonics generated, but makes a good starting point. The design calls for a 50uF ASC oil cap, followed by Electra-Print's 20H choke, and then a dual combo of 100uF Solen aluminium can and a 47uF Solen PPE capacitor. There is scope to change the last 47uF to a 50uF ASC Oil. Wanted to avoid electrolytics not just for the rumoured acoustic difference, but also for reliability. The power supply transformer is 410-0-410V, which is an odd rating, but I am sure that Jack (Electra-Print) is able to wind one that is suitable.
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