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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: Smps poweringPosted by JOHNR on: 10/17/2015

The system starts as a commercial multi voltage smps unit, 48 volt output from Meanwell.
I place this in a box because I have to equip the unit with a multiple pole filter card.
The output is fixed, 300 watts and connected to a dc filter board equipped with 4 outputs namely amp1, amp2, line amp, DAC.
They are in turn rated at 2amps, 2 amps 1amp and 1 amp and the CMchokes are sized to suit.
I hard wire each of these in turn with a 4 way power cord equipped with a special 4 way plug on the end.

The significance of the 4 way power cord is that I build all of the system with a Power Ground (PE) and an RF ground and of course the main power feeds +24 and -24. Over the years of development I have identified common mode noise sources and have designed solutions to control this noise.
The PE connections are brought into the box and are connected to the power plug socket to comply with safety regulations.
the RFG connections are terminated on a dedicated single socket on the back of the box;actually an Eichmann binding post. This is connected in turn to a plug for insertion into a power strip. Anally retentive audiophiles can of course connect this directly to a ground post hammered into the soil. I live on the 23rd floor so I connect it to the power strip. The plug location does make a difference so it is to be tried out in each location for best results.

Each amplifier and line amplifier is fitted with a socket and a central filter unit that serves to isolate each of the converters from each other.
The outputs are respectively: tube 1, tube 2, DHT filament and the B+ generator board. Nowadays I use a common filament supply for ease of build and it happens to out perform the other types that I have built over the years.

I have covered the filament supply in a similar post today and in the case of DAC supply, the same applies.
If by chance your DAC needs 15 volts for example, I cannot help there. But, as an advisory,if you use the bulk supply smps, obtain the same converter module from Element 14, choose a lower rated version, equip the output with at least 2 different types of common mode chokes caps on the front, center and end to bring the nose levels down and hook it up. The components all fit on Vero board centers otherwise hard wire using hookup wire.

Depending upon general interest, I will make available to the individual whatever he requires to move forward with this.

I should point out that I live in Kuala Lumpur Malaysia so unless anyone lives locally, listening will not be possible. Tourists though will be most welcome.

Sharing is GO.
Regards
John

Schematics -- can be made available however, we need to determine file types and so forth for readability.

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