I would run DC, with filtering in both chassis. Still twist the leads, even with DC.
The female chassis connector should be on the power supply, and
the male chassis connector should be on the preamp.
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You can run long AC wires if they only have 50/60Hz current and voltage. For example, AC heater wiring.
You should not run long wires if they have charging current pulses for a capacitor input PSU. The transformer, rectifier and reservoir capacitor should all be near each other in the same box with twisted wiring to minimise the magnetic field.
You should not run long wires if they have charging current pulses for a capacitor input PSU. The transformer, rectifier and reservoir capacitor should all be near each other in the same box with twisted wiring to minimise the magnetic field.
Hi there,
there is a compromise arrangement which I use, which is to house the mains transformer, rectifier and initial smoothing caps in a separate metal box, send the rectified D.C. up an umbillical cable where I have some more smoothing and a dc regulator.
I also use this technique for power amps (with no regulator) as Scottjoplin stated, with loads of capacitance at each end.
Happy soldering
Mike
there is a compromise arrangement which I use, which is to house the mains transformer, rectifier and initial smoothing caps in a separate metal box, send the rectified D.C. up an umbillical cable where I have some more smoothing and a dc regulator.
I also use this technique for power amps (with no regulator) as Scottjoplin stated, with loads of capacitance at each end.
Happy soldering
Mike
I found that with a separate PSU phono stage the earthing arrangement in becomes very critical. In my phono stage I had to go through a few variations. For some reason that I haven’t worked out yet the current arrangement has stopped the phono stage picking up every switching transient from the various appliances (boiler, dishwasher, washing machine) in the house.
Shield wiring practices have an existence in the automotive industry. The learning of telephonic and alternating current power transmission lines are due to the inherently long runs. This occurrence can be due to the chassis to the earth grounding when the plugin is done to the properly wired alternating current outlet.
Question, would the resistance of the jumper cable be sufficient in order to add a second set of filter caps to the second chassis? Or would one need to add a larger resister between them. I ask because currently I have a separate power supply chassis with the smoothing caps located in the amplifier chassis due to size constraints. This appears to be incorrect based upon this discussion. I would be tempted to add a small lower value set to the power supply chassis say 1000uF, with the larger 13000uF left still mounted where they are. If the cable provides sufficient resistance, I would not be lowering my DC rail voltages. I have had it the wrong way round now for 27 years, but if it would be an improvement would add these caps. Thanks.
Regards,
Bill
Regards,
Bill
With significant filtering (half or so) in the supply chassis, the charging pulses
will tend to remain localized there, which is a good thing. A small series resistor
in line between the chassis will assist, and will also help filter some of the ripple.
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