Remote power supplies
Posted: Thu Aug 29, 2019 5:13 pm
I have been thinking for a while now to have all the power supplies in my system remote from the circuitry they supply. Lots of examples of it being done. NVA has / had phono amps and the cubix pro with remote supplies.
The main advantage is getting the transformer and charging loop (transformer > rectifier > smooting caps) well away from the sensitive circuitry. But there are disadvantages as well like increased resistance in the power supply - that long umbilical from psu to head unit. The best way i can see to make use of that cable resistance is to put the final smoothing capacitor in the head unit and the resistance then becomes part of a CRC filter.
Some people have just put the transformer remotely and left the rest of the psu near the load. Whist this may seem to be the perfect solution the charging loop between transformer, rectifier and smoothing caps is now very big and the cable between the two parts could radiate all sorts of nasty interference.
I suppose the only way to find out what works best is to try em all and build a noise sniffer (coil wired up to an amp and speaker ?) Or just use my ears. Not as if my to do list wasn't big enough already
The main advantage is getting the transformer and charging loop (transformer > rectifier > smooting caps) well away from the sensitive circuitry. But there are disadvantages as well like increased resistance in the power supply - that long umbilical from psu to head unit. The best way i can see to make use of that cable resistance is to put the final smoothing capacitor in the head unit and the resistance then becomes part of a CRC filter.
Some people have just put the transformer remotely and left the rest of the psu near the load. Whist this may seem to be the perfect solution the charging loop between transformer, rectifier and smoothing caps is now very big and the cable between the two parts could radiate all sorts of nasty interference.
I suppose the only way to find out what works best is to try em all and build a noise sniffer (coil wired up to an amp and speaker ?) Or just use my ears. Not as if my to do list wasn't big enough already